slidebaigiangc# va linq asp - winform-bài tập

7/27/2019 SLIDEBAIGIANGC# VA linq ASP - WinForm-bi tp

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Nguyn Hong H - Khoa CNTT-HKH 1

Ni dung hc

Tng quan v .Net FrameWork

S dng IDE

Gii thiu NNLT C#

WinForm

LINQ: LINQ TO SQL

Xy dng ng dng Web


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CHNG I


3/272


Gii thiu

.NET Framework l mi trng tch hpnginha vic pht trin v thc thi cc ng dng trnInternet, desktop v cc thitb di ng .

Cc mc tiu chnh: Cung cpmt mi trnghngitngnht quncho nhiuloingdng

Cung cpmt mi trnggim ti thius xung t

phin bn. Cung cp mt mi trng linh ng, da trn cc

chuncchngnhn c thcha trn btchiu hnh no.


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Kin trc ca .NET Framework


5/272



CLR (Common Language Runtime):Qun l sthc thi m lnh v ttc cc tc v lin quan nn: bin dch, qun l b nh, bo mt, qun ltuynon.M lnhthc thi trong CLR chia lm 2 loi:- m cqun l- m khngcqun ll m lnh khng ci t

nhng yu cuthc thi trong CLRchnghnnh COM hoc cc thnh phnda trn WindowsAPI.


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FCL(Framework Class Library ) l thvinkiu d liu c th ti s dng (gm ccclass, structure, ) dnh cho cc ngdng

thc thi trong .NET.

Tt c cc ngn ng h tr .NETFramework usdng thvin lp dngchung ny.


7/272Nguyn Hong H - Khoa CNTT-HKH 7

Cc bc thc hin ca Cttruyn thng

Source

Code

Compiler

Executable

Code

Code

Executed

R

U

N

TI

M

E



Cc bc thc hin ca Cttruyn thng

Cc ngn ng trc y c chngtrnh dch ring v c mi trng chyring ca n.

Trong .NET, chng trnh dch dch mngun vo mt "Intermediate Language(IL) v runtime c thay th bi CLR

(Common Language Runtime).



Cc bc thc hin ca cc ct .NET

1st Compliation

2nd Compliation

.NET

SourceCode

Language

Compiler

MSIL

+Metadata

CLR

Machine

code

Code

executed

Cc chng trnh .NET c dch 2 ln: ln u chm, ln th 2 tngi nhanh hn.




Chng trnh ngun trc ht s c bindch v ng gi thnh mtkhigi l assembly(l tphp cc thnh phncng gi trongfile exe hoc dll). Khi ny scha cc m lnhngn ng trung gian (IL) v cc metadata m tthng tin cnthit cho shotngcakhi.

Mi khi c yu cu thc thi assembly ni trn,CLR s dng trnh bin dch JIT (Just-in-Time)cami trng thc thichuyni IL chatrong n sang dngm lnhcthca mykhingdngthcsthc thi.



Cc kiu d liu c s ca CTS



Chng 2

Gii thiu Visual Studio.NET



S dng IDE Microsoft Visual Studio 2008

Khi ng Microsoft Visual Studio 2008. File New

Project to mi mt project



Chia s IDE

VS.NET cung cp IDE cho tt c cc ngn

ng ca n.

Gip cho ngi lp trnh xy dng 1

chng trnh nhanh chng v hiuqu

Khi VS.NET khi ng, th trang StartPagec hin th.



Chia s IDE [3]



Design, Split, Source (WebForm) Design:ch thit k giao din Source:Hin th m HTML t ng pht sinh khi thit k



Solution Explorer

Solution Explorer litk cc projects v cc

file anghotng hin th SolutionExplorer, nhn Ctrl+Alt+L(View|Solution Explorer )


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ToolBox

Bao gm cc iukhin trn Web form vWin form, ActiveX

controls, XML Webservices, cc thnh

phn HTML v cc i

tng. hin th Toolbox,

nhn Ctrl+Alt+X

(View|Toolbox).


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Server Explorer

Server Explorer Lptrnh trn CSDL m

khng cn s dngVS.NET IDE.

hin th ServerExplorer, nhn

Ctrl+Alt+S(View|Server Explorer)


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Class View

Class view hinth cclp, phng thc vthuc tnh xy

dng. hinth Class View,

nhn Ctrl+Alt+C

(View|Class View).


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Properties Window

Properties window thit lp ccthuc tnh cc iu

khin, lp vprojects.

hin th

Properties Window,nhn F4.


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K thut IntelliSense

Thng bo cho ngi lp trnh c phpng v cho php hon thnh t ng 1cu lnh


24/272


S kin v p ng s kin[1]

Ta c th tng tc gia cc i tng khc nhaubn trong 1ngdng,gia 1 itng v itngbn ngoi thng qua skin v pngskin.


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S kin v p ng s kin[2] hin th tt cc cc s kin ca iu khin:

Chn iu khin Kch vo button Event trn ca s Properties


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V d x l s kin

S kin

p ng s kin

Ngi dngchn nt

Design:hin th b cc ca trangSource:Hin th m t ng pht sinh khito trang Web.


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28/272


Ni dung

Gii thiu

Bin v cc kiu d liu

Cc cu trc iu khin: if, switch

Cc cu trc lp; for, while, do while,

foreach

LIST, File vn bn.


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GII THIU V C#

L NNLT n gin, hin i, an ton vhng i tng

L ngn ng mnh nht trong .NET

Thay th cho C++ C c php ging C++, Java

S dng con tr d dng hn trong C++


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GII THIU V C#

- bitoncngiiquyt l mt Solution.

- Mt solution bao gm mt hoc nhiuproject.

- Mt solution, nu c nhiu project th nncto ra trong mtthmc ring cthcha cc project trong n.


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C php n gin ca 1 Project

Using cc Namespace[Namespace Ten]

{

- Tp hp cc lp}


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Bin

Khai bo theo c php:

Mc truy cp Kiu Tn bin

public

protected

private

int

string

...


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Cc kiu s nguyn

0:264-1S nguyn khng du 64-bitSystem.UInt64ulong

0:232-1S nguyn khng du 32-bitSystem.UInt32uint

0:216-1S nguyn khng du 16-bitSystem.UInt16ushort

0:28-1S nguyn khng du 8-bitSystem.Bytebyte

-263:263-1S nguyn c du 64-bitSystem.Int64long-2

31

:231

-1S nguyn c du 32-bitSystem.Int32int

-215:215-1S nguyn c du 16-bitSystem.Int16short

-27:27-1S nguyn c du 8-bitSystem.SBytesbyte

Vng biu din(min:max)

M tKiu trongCTS

Tn


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Kiu s thc, Boolean, k t

Kiu s thc: float, double

Kiu Boolean: bool: true|false

Kiu k t: char Biudin 1 k t 16-bit (Unicode) Cc hngkiu k t c gn bng cch ng trongcpdu nhy n, v d 'A'.

Ki u d liu tham chi u


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Ki u d liu tham chi uc nh ngha sn

Chui k t UnicodeSystem.Stringstring

Kiudliugc,mikiudliu khc

trong CTS ukthaty(kccc kiudliu gi tr)

System.Objectobject

M tKiu CTSTn


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V d

protected void Page_Load(object sender, EventArgs e)

{

object t;

t = (object) 5;

string[] st = new string[2] { "ab","cd" };

object[] t1;

t1 = st;Response.Write(t1[1].ToString());

}


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Cc phng thc trn chuiprotected void Page_Load(object sender, EventArgs e)

{ string st1 = " Nguyen Anh Trung ";

string st2 = "le Tien Tang";

st1 = st1.Trim();

Response.Write(string.Format("Chieu dai chuoi la {0}:\n",

st1.Length));Response.Write(string.Format("Ky tu tai chi so thu 3 la {0}", st1[3]

string ten1 = st1.Substring(st1.LastIndexOf(' ') + 1);

string ten2 = st2.Substring(st2.LastIndexOf(" ") + 1,

st2.Length - st2.LastIndexOf(" ") - 1);

Response.Write (string.Format("Ten2=ten1:{0}",ten2.Equals(ten1)));

Response.Write(string.Format("so sanh ten1 voi ten 2: {0}",ten1.CompareTo(ten2)));

}


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Cc phng thc trn chuiprotected void Page_Load(object sender, EventArgs e)

{ string st1 = "Nguyen Anh Trung ";

Response.Write(string.Format( "Tim chuoi con {0}",

st1.Contains("yen")));

st1 = st1.Replace("Nguyen", "Le");Response.Write(st1);

st1 = st1.Remove(0, 3);

Response.Write(st1);

st1 = "Le nam|tink26|dhkh";

string[] ds = st1.Split('|');

Response.Write(string.Format("ten:{0},lop:{1},truong{2}",

ds[0], ds[1], ds[2]));

Cc ton t


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Cc ton t

checked uncheckediukhin Overflow exception

Sizeof(Kiu)Thng tin vkiu

newToitng

?:iukin ()p kiu

[]Indexing (cho array v cc indexers)

.Truy xut thnhphn

= += -= *= /= %= &= |= ^= =Php gn== != < > =So snh

>Dch bit

++ --Tng v gim

+Cngchui&& || !Logic

+ - * / %Shc

K hiuLoi ton t


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Lung iu khin ca chng trnh

Cc cu lnh r nhnh if

switch

Cc cu lnh lp for

while

do

foreach


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Cu lnh ifint i = 10;

if (i


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Cu lnh Switch...

int i = 2;

switch (i)

{

case 1:

Response.Write("one");

break;case 2:

Response.Write("two");

break;

default:

Response.Write("another value");

break;}

...


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Cu lnh Forint s = 0;

for (int i=1; i


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Cu lnh while

int i = 1;int s = 0;

while (i


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Cu lnh Foreachint[] a = new int[3];

a[0] = 10;a[1] = 20;

a[2] = 30;

foreach (varb in a){

Response.Write(b);

}


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ArrayList, LIST

L mng ng, mi phn t l mt object

Namespace: System.Collections

Khai bo:ArrayList = new ArrayList();List =new List()

List =new List ()

C h th t A Li t


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Cc phng thc trn ArrayList,List

Add(object): Chn thm 1 phn t vo cuimng

Clear(): Xo tt c cc phn t

Contains(object): Tm object trong mng IndexOf(object): Tm ch s ca object trongmng (-1)

RemoveAt(index): Xo phn t th index

Thuc tnh: count: cho bit s phn t trongmng


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Thao tc trn File

Namespace: System.IO;

Cc i tng thao tc trn File: Stream,StreamReader, StreamWriter, FileStream.

Thao tc trn file vn bn: StreamReader,StreamWriter.

M file vn bn c:StreamReader = new StreamReader(dd"[,Encoding]);

M file vn bn ghi:StreamWriter = new StreamWriter (dd[, bool

append][,Encoding])


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Cc phng thc trn StreamReader

Close(): ng file

Peek(): Tr v k t tip theo, -1;:EOF

Read(): c k t tip theo ReadBlock(): c dy cc byte

ReadLine(): c 1 dng

ReadToEnd(): c ht file

Cc phng thc trn StreamWriter


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Cc phng thc trn StreamWriter

Close(): ng file

Write WriteLine: ghi file

V d:StreamWriter f = new

StreamWriter("d:\\tt.txt",true,Encoding.Unicode);

f.WriteLine("cng");

f.Write("abc");

f.Close();

S


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V d StreamReaderusing System;

using System.IO;

StreamReader f = new StreamReader("d:\\tt.txt");

string ht;while(f.Peek()>=0)

{

ht = f.ReadLine();

Response.Write(ht);

}

f.Close();


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DataTable- Name space: using System.Data;

-To bng:DataTable bien = new DataTable("tenbang");

To ct: bien.Columns.Add(tencot");

- To thm dng:DataRow dong=bien.NewRow();

Dong[tencot]=gia tri

dt.Rows.Add(dr);dt.AcceptChanges();

- Bien.Rows: tr v tp hp cc dng- Bien.Coumns: Tr v tp cc ct

V d v DataTable


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V d v DataTableprotected void Page_Load(object sender, EventArgs e)

{ DataTable dt = new DataTable("Sach");

// to ra 2 ct (field) ca bng Sachdt.Columns.Add("Masach"); // To ra ct MaSach

dt.Columns.Add("Tensach"); // To ra ct TenSach

DataRow dr = dt.NewRow();//To thm 1 dng mi

dr["Masach"] = "s1"; //Nhp d liu cho ct m sch

dr["TenSach"] = "tin";dt.Rows.Add(dr); //Thm dng vo dt

dr = dt.NewRow(); //To thm 1 dng mi

dr["Masach"] = "s2";

dr["TenSach"] = "hoa";

dt.Rows.Add(dr);dt.AcceptChanges();

for(int i=0;i


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Ni dung

Lp i tng Hm dng

Hm hu

Trng

Phng thc

L i t


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Lp i tngMctruycp class :

{ - Hm dng (Constructors) Hm hu (Destructors) Hng (Constants) Trng (Fields) Phng thc (Methods)

Thuc tnh (Properties) Ch mc (Indexers) S kin (Events) Con tr hm (Delegates)

Lp con (Classes) Giao din (Interfaces) Cu trc (Structs)

}


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Mc truy cp

Bin hocphng thc ch c th c truy xut tbn trong kiudliu m n thucv

private

Bin hocphng thc c th c truy xut trongphm vi assembly hin ti, hoc t cc kiu d liudnxuttkiudliucha n

protected

internal

Bin hocphng thc ch c th truy xut t bntrong kiu d liu m n thuc v, hoc cc kiu dliudnxut

protected

Binhocphngthcch c th truy xut trongphmvi cng assembly

internal

Binhocphngthc c thc truy xuttbtcni no

public

M tMc truy cp

V d


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V dpublic class Class_b

{ private class Class_b1

{ }

public class Class_b2

{ }

}

class Program

{ public void test()

{Class_b t2 = new Class_b();

Class_b.Class_b1 t21 = new Class_b.Class_b1();

Class_b.Class_b2 t22= new Class_b.Class_b2();

}

H d (C t t )


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Hm dng (Constructors)

L mt loi c bit ca phng thc trong mt lp c gi khi mt lp c to.

Thng c s dng khi to cc gi tr trongmt lp.

Tn trng vi tn lp

Khng tr v gi tr

Nu khng to ra hm dng C# s to ra hm dng

ngm nh Mtlp c th c nhiu hm dngnhng khc nhau

vslnghockiuca tham s

V d C


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V d vConstructorsusing System;

public class Person

{public string Ten,dc=Khong co ;public Person(string Ten){

this.Ten = Ten;}public Person(string Ten,string dc)

{

this.Ten = Ten;this.dc = dc;

}}

V d C t t


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V d vConstructors

public partial class _Default : System.Web.UI.Page

{


{

person p1 = new person("hung");

Response.Write(p1.Ten + p1.dc);

person p2 = new person("Nga","hue");

Response.Write(p2.Ten + p2.dc);

}

}

D t t


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Destructor

Destructors trong C# gi l b thu gom rcGarbage Collectors. B thu gom rc s gii phng b nh khi

i tng khng cn yu cu hoc tham

chiu. Destructors khai bo nh sau:

~()//ging tn lp

{//cc ci t ca ngi lp trnh

}


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Cc trng (Fields)

Lu tr gi tr

C php:

Mc truy cp: public, private, protected,internal, protected internal

Kiu: Kiu gi tr c nh ngha sn (int,char )

Kiu tham chiu: lp, struct, mng, chui,.

V d


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V dnamespace Vidu

{

class Class_Lop{ }

class SinhVien

{ public string hoten;

private bool GioiTinh;protected DateTime NgaySinh;

internal float[] DsDiem = new

float[100];

Class_Lop Lop= newClass_Lop();

}

class Program

{

static void Main(string[] args)

{

SinhVien sv =new SinhVien();

sv.hoten = "Nguyen Nam";//sv.GioiTinh = false;

//sv.NgaySinh =

DateTime.Parse("12/10/79");

sv.DsDiem[0] = 5;

}

}}

Trng tnh [1]


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Trng tnh [1]

c khai bo trong 1 lp Khi sdng khng cnphito ra lpcha

trngtnh

Khi khai bo ch cn dng static trc tn

bin

Truy xut: .tn trngtnh

V d trng tnh


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V d trng tnhusing System;

public class List{

public static int Dem= 0;public List()//Hm dng: cgi khi tolp{Dem++;}

}


{


{

Response.Write(List.Dem);

List n1 = new List();Response.Write(List.Dem);List n2 = new List();Response.Write(List.Dem);}

}


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Phng thc(method)

L tp hp cc cu lnh c khai bo trong lp hoc cu trc,

phi ch r mc truy cp, tn, kiu tr

v,danh sch cc tham s. Nu khng ctham sphi c cpdungoc Phng thc khng tr v gi tr c kiu

trv l void Dng return trv gi tr caphng

thc

Tham chiu ref and out [1]


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Tham chiu ref and out [1]using System;

public class Point

{

int x;

int y;

public Point(int x,int y)

{

this.x = x;

this.y = y;

}

public voidGetPoint(int x,int y)

{x = this.x;

y = this.y;

}

}



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Tham chiu ref and out [2]public partial class _Default : System.Web.UI.Page

{


{

int x = 0; //int x; --> Error

int y = 0; //int y; --> Error

Point p = new Point(100,200);p.GetPoint(x,y);

Response.Write("({0},{1})",x,y);

}

}

Output:

(0 0) Tham chiu ref and out [3]


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public class Point

{

int x;

int y;


{

this.x = x;

this.y = y;

}

public voidGetPoint(ref int x,ref int y)

{x = this.x;

y = this.y;

}

}



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{


{

int x = 0; // int x; --> Error

int y = 0; // int y; --> Error

Point p = new Point(100,200);p.GetPoint(ref x,ref y);

Console.WriteLine("({0},{1})",x,y);

}

} Output:

(100,200)-phi khi to gi tr cho cc tham s-Khi xy dng v gi phng thc phi dng ref



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public class Point

{

int x;

int y;


{

this.x = x;

this.y = y;

}

public voidGetPoint(out int x,out int y)

{x = this.x;

y = this.y;

}

}



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{


{

int x;

int y;

Point p = new Point(100,200);p.GetPoint(outx,outy);

Console.WriteLine("({0},{1})",x,y);

}

}

Output:(100,200)

Khng cn khi to gi tr cho cc tham s

Khi xy dng v gi phng thc phi dng out

Danh sch cc tham s c chiu di thay i [1]


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Danh sch cc tham s c chiu di thay i [1]

C# cho php khai bo 1 tham snhng khigiphngthc th slng tham s c th

thay i

V dnh WriteLine()

Sdng t kho params khai bo tham

s c chiu di thay i.

K tha


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K tha

- C# ch h tr n ktha, tc l mt lpchc th k tha nhiunhtl tmtlp cha

- Lp c s nht trongC# l lp System.Object

class LopCon : LopCha

{ Cai dat lop con}

V d v k tha [1]


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V d v k tha [1]using System;

public class Person

{

protectedstring name; //protected Field

public Person(string name) //Function as a Constructor

{this.name = name;

}

}

public class Employee:Person{public Employee(string name):base(name){}

}

V d v k tha [2]


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[ ]public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e){

Person p1 = new Person("Harry Potter");

Respone.Write(p1.name);

}}

V d v k tha [3]


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V d v k tha [3] Person l lp c s (lp cha).

Employee l lp dn xut (lp con) t lpPerson, v th:

N k tha tt c cc d liu v hm thnhvin ca lp cha (tr private)

Constructors khng t ng k tha ln lpcha, do ngi s dng phi ch r:

public Employee(string name):base(name){}

Hm np chng (Overloading )


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p c g (O e oad g )

Hm np chng l hm trng tn trong mt lp

nhng khc nhau v s lng v kiu ca cc

tham s

Khng npchngda vo tn tham s v kiutrvca cc tham s.

V d [2]


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[ ]class TinhDt

{public double Dt(double r)

{

return ((double)Math.PI*r*r);

}

public double Dt(double a,double b)

{ return a*b;

}

public double Dt(double a,double b,double c)

{ double p=(a+b+c)/2;

return Math.Sqrt(p*(p-a)*(p-b)*(p-c));

}

V d [3]


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V d [3]


{


{

TinhDt DienTich=new TinhDt();Console.WriteLine("Dt HT {0}",DienTich.Dt(3));

Console.WriteLine("Dt HCN {0}",DienTich.Dt(3,4));

Console.WriteLine("Dt HTG{0}",DienTich.Dt(3,4,5));

}

}

Hm ghi (Overriding) [1]


82/272


Hm ghi (Overriding) [1]

Hm ghi l hm ging nhau trn c lpcha v lp con.

ghi mt hm c trn lp cha: Khai bo mt hm mi trong lp con vi tn

ging vi lp cha.

S dng tnew.

Hm o (Virtual Functions) [1]


83/272


Hm o (Virtual Functions) [1]

Cch xy dng hm ogingnh hm ghi nhng s dng t kho virtual tronghm calp cha v override trong hm calp con

Khi gi hm, trnh bin dchs nhn vo lpthcscto ra v gi hm tngngtrn lp ny

Giao din (Interfaces)


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Giao din (Interfaces)

Giao dingingnhlptrutng Cha cc phng thc tru tng nhng

khng ci t.

Mt lpktha ln 1 giao dinphi ci tttc cc phngthc trn giao din.

Mtlpchktha ln 1 lp khc nhng c th

ktha trn nhiu giao din.

V d [1]


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V d [1]

using System;

interfaceMusic

{

voidPlayMusic(string filename);

voidEndPlay();

}

V d [2]


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Vd [2]public classWinamp:Music

{

publicWinamp(){

}

public voidPlayMusic(string filename)

{

}

public voidEndPlay(){

}

}

THUC TNH


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THUC TNH

Giithiu

Cc loicathuc tnh

Thuc tnh v trng Thuc tnh v phng thc

Thuc tnh tnh

Gii thiu [1]


88/272


Gii thiu [1] Thuc tnh trong 1 lp c s dng ly

v thay i gi tr trong lp. Mt thuc tnh thng c 2 khi lnh:

Get: tr v mt gi tr

Set: Gn mt gi tr mi T kho value c s dng xc nh gi tr

c gn trong khi set.

Gingnh hm thuc tnh c th dng btvirtual, override, abstract, static

V d [2]


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[ ]using System;

public class Person{

string name; // Field

public stringName // Property

{

get{

return (name);

}

set

{

name = value;

}

}

}

V d [3]


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[ ]public partial class _Default : System.Web.UI.Page

{


{

Person p = new Person();

p.Name = "John Smith";

Response.Write("Person name is {0}",p.Name);}

}

Output:Person name is John Smith

Cc loi thuc tnh


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Read/Write: Thuc tnh c c get v set.

Read-Only: Thuc tnh ch c get.

Write-Only: Thuc tnh ch c set.

X l ngoi l (Exception Handling)


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g ( p g)

Dng Trying v Catching

Kin trc cangoil

Truynngoil Sdng Finally

Ngoi l [1]


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g [ ]

Ngoi l c pht sinh khi chy chngtrnh bli.

Ngoil cung cpy thng tin vlixyra.

Ki n trc phn t ng ca ngoi l[2]


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[2]

Exception

IOException

System Exception

OutOfMemoryException

OverflowException

CoreException

NullReferencException

Trying v Catching [1]


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y g g [ ]

Khi try chaonchng trnh Khi catch x l li, khi c lixy ra.

Dng 1 khi try nhng c th nhiu khi

catch

Khng c try v catch chng trnh dngli(treo) v a ra li.



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y g g [ ]using System;class Test

{public static voidMain(){int Zero = 0;try{

int j = 22 / Zero;}catch (Exception e){

//X l li

}

} Cc lnh sau catch}



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y g g [ ]int Zero = 0;try

{ int j = 22 / Zero;}catch (DivideByZeroException e){

//X l li1

}catch (Exception e){

////X l li 2

}



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y g g

Ktquhinth:

Loi 1:Attempted to divide by zero.

Sau catch

Truyn ngoi l [1]


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Trong 1 strnghp chng ta khng x l

khi lixy ra, chng ta cntruyn cc li nyn hm gi n

C 3 cch lm iu ny:

Khng x l li Truynlin hm cgi

Truynlicthn hm cgi.

Truyn ngoi l[2]


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Khng x l liusing System;

public class SumClass{

int sum= 0;

int count = 0;

int average = 0;

public voidCalculateAverage(){ try

{

average = sum/count;

}catch{}

}

}

Truyn ngoi l[4]


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Btli, sau truynli ny n hm cgiusing System;

public class SumClass{ int sum= 0;

int count = 0;

int average = 0;


{


}

catch (DivideByZeroException e){throw e;

}

}

}

Truyn ngoi l[6]


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X l li, sau truyn cc lix l n hm cgi.

using System;public class SumClass

{ int sum= 0;

int count = 0;

int average = 0;


{


}

catch (DivideByZeroException e){

throw (new DivideByZeroException(Loi roi:"));

}

}

S dng Finally


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Khi Finally cha on chng trnh lun lun

thchin cho d c pht sinh li hay khng?try{

//onchng trnh

}

catch

{

//X l li

}

finally{

//onchng trnh lun thchin

}

Thc hnh


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Tolp CauHinh ktnin file ds.txtusing System.IO ;namespace ThucHanh{

public class CauHinh

{public static StreamReader f;public CauHinh(string DD){

f = new StreamReader(DD);}

}

}

To Lp SinhVien


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using System.Collections.Generic ;

namespace ThucHanh

{ public class SinhVien{

private string masv;

public string Masv

{

get { return masv; }

set { masv = value; }

}

private string hoten;

public string Hoten{

get { return hoten; }

set { hoten = value; }

}

private double dtb;

public double Dtb

{get { return dtb; }

set { dtb = value; }

}

private string tenlop;

public string Tenlop

{

get { return tenlop; }

set { hoten = value; }

}public SinhVien(string masv, string ht,

double dtb, string tenlop)

{ this.masv = masv; this.hoten = ht;this.dtb = dtb; this. tenlop= tenlop

} }}

To 1 lp: LopHoc cha cc sinh vin


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using System.Collections.Generic ;

using System.Data;

namespace ThucHanh

{

public class LopHoc

{

public List LstSinhvien ;public DataTable DtSinhVien ;

public LopHoc()//Hm dng{

LstSinhvien = new List();//To List

DtSinhVien = new DataTable("Sinhvien"); //Tao DataTable

DtSinhVien.Columns.Add("Masv");//To cc ct ca bngDtSinhVien.Columns.Add("Hoten");

DtSinhVien.Columns.Add("DTB");

DtSinhVien.Columns.Add(TenLop");

while (true)//Duyt file ds.txt{


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string st = CauHinh.f.ReadLine();//c ra 1 dngif (st == "" || st == null) { CauHinh.f.Close(); break; }

string[] tam = st.Split('|');//Tch ra cc thng tinSinhVien sv = new SinhVien(tam[0],tam[1],double.Parse(tam[2]), tam[3] );

LstSinhvien.Add(sv);//Np d liu vo ListDataRow dr = DtSinhVien.NewRow(); //To 1 dng mi trn bngdr["masv"] = tam[0]; dr["hoten"] = tam[1];

dr["DTB"] = double.Parse(tam[2]); dr[tenlop"] = tam[3];DtSinhVien.Rows.Add(dr);

DtSinhVien.AcceptChanges();

}

}

}

}

Lp trnh trn s kin Page_Load ca trang


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Default.aspx

protected void Page_Load(object sender, EventArgs e){ //To ra ng kt ni n file tt.txt

CauHinh kn = new CauHinh(Server.MapPath("ttt.txt"));

LopHoc sv = new LopHoc();

//Hin th cc sinh vin trn ListResponse.Write("Danh sach cac sinh vien tren List ");for (int i = 0; i < sv.LstSinhvien.Count; i++)

{

Response.Write(sv.LstSinhvien[i].Masv +"
");Response.Write(sv.LstSinhvien[i].Hoten + "
");

Response.Write(sv.LstSinhvien[i].Dtb.ToString() + "
");

}

//Hin thi cc sinh vin trn DataTable


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//Hin thi cc sinh vin trn DataTableResponse.Write("Danh sach cac sinh vien tren DataTable ");for (int i = 0; i < sv.DtSinhVien.Rows.Count; i++){

Response.Write(sv.DtSinhVien.Rows[i]["Masv"].ToString() + "
");Response.Write(sv.DtSinhVien.Rows[i]["hoten"].ToString() + "
");Response.Write(sv.DtSinhVien.Rows[i]["DTB"].ToString() + "
");

}}


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Trn lp: LopHoc vit cc phng thc : Hin th cc sinh vin ln lp

Hin th cc sinh vin li

Tnh TBC ca TB ca cc sinh vin To file olai.txt lu cc sinh vin li

Xa cc sinh vin li ra khi file ds.txt


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Chng 4

WINFORM


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Ni dung

Cc lp th vin

Cc thuc tnh v phng thc

X l s kin

Cc thnh phn giao din c bn


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Application

User Interface

Program

Cc lp th vin


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Cc lp th vin

.Net Framework da trn cch tip cn hng

i tng

Cc lp th vin c chia vo cc namspace

V dSystem.Windows.forms



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Frog

Height :12 cmWeight :100gmName : Jumpie

Jump

HeightWeightName

Th hin ca lp

S ki ki [1]


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Ta c th tng tc gia cc i tng khc nhaubn trong 1ngdng,gia 1 itng v itngbn ngoi thng qua skin v pngskin.



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hin th tt cc cc s kin ca iu khin kchvo button Event trn Properties window.

V d x l s kin


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private void button1_Click(object sender, System.EventArgs e){

}

Ngi dng

chn nt

S kin

p ng s kin

MessageBox.Show("Goodluck to you!");


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ng dng Windows

Thnh phn c bn l Form

Hin th thng tin ca ngi dng

Nhn thng tin t ngi dng

Mt ng dng c th c nhiu Form

WinForms


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WinForms

Form c trnh by nh 1 lp trong

WinForms. Btk khi no ngdnguc to th 1 form

sc thm vo

WinForms sto ra 1 thhincalp Form


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Cc iu khin (Controls)

Trn Form c th c nhiu iu khin hin th v

nhp d liu ca ngi dng. C th thit k cc iu khin Toolbox

Cc thuc tnh chung cho cc Controls


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Visible

TextName

ForeColor

EnabledCanFocus

BackColor

Thuc tnh

Controls


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Controls

Label

TextBox

Button

ListBox

ComboBox

CheckedListBox


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PROPERTIES

Image

TabStop

Paint

Events

Methods

Label


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PROPERTIES

Events

Methods

AcceptReturn

MaxLengthMultiline

Passwordchar

ReadOnly

ScrollBars

ClearCopyCut

MultilineChanged

TextChanged

TextBox


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PROPERTIES

Events

Methods

DialogResult

TextAlign

Button


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PROPERTIES

Items

MultiColumn

SelectedIndex

SelectedItem

SelectedItems

SelectedValue

Sorted

Text

ListBox [1]


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EventsMethods

ClearSelected

FindString

GetSelected

SetSelected

SelectedIndexChanged

SelectedValueChanged

ListBox [2]


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PROPERTIES

Events

Methods

CheckedIndices

CheckedItemsThreeDCheckBoxes

GetItemChecked

GetItemCheckState

SetItemChecked

SetItemCheckStateItemCheck

CheckedListBox


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PROPERTIES

Events

Methods

DropDownStyleFocused

MaxDropDownItems

Select

SelectAll

DropDown

ComboBox


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T kho this

idin cho Form hinthi truy xutn ttc cc thuc tnh, phngthc,trng v skinca Form hinthi.

V d

this.[controlname].[propertyname]


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To WinForm Applications


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pp

File -> New -> Project

Thm 1 Item vo project


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p j

Project -> Add New Item

Label: Properties: Image


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Npnh vo Label:Properties: Image= Image.FromFile(fileName);


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Properties: Image= Image.FromFile(fileName);Event: Click, DoubleClick: Thay i nh


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Gi s trong Bin c 7 nhc tn 1 jpg 2 jpg


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c tn 1.jpg, 2.jpg,

int i =1 ;

private void label1_Click(object sender, EventArgs e)

{label1.Image = Image.FromFile(i.ToString()+".jpg");

i++;

if (i == 7) i = 1;

}

checkedListBox: Properties: Items,...Method: GetItemChecked, ...


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checkedListBox1 list1

comboBox1

Khi nhn enter trn textBox1


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private void textBox1_KeyPress(object sender,

KeyPressEventArgs e)

{ if(e.KeyChar==13)

checkedListBox1.Items.Add(textBox1.Text);

}

Khi chn trn 1 mc trn checkedListBox1


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private void checkedListBox1_ItemCheck(object

sender, ItemCheckEventArgs e)

{listBox1.Items.Add(checkedListBox1.Items[e.Index]);

}

Khi chn chn trn butsend


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private void butSend_Click(object sender, EventArgs e)

{

for (int i = 0; i < checkedListBox1.Items.Count; i++)

if (checkedListBox1.GetItemChecked(i) )

comboBox1.Items.Add(checkedListBox1.Items[i]);

comboBox1.Text = comboBox1.Items[0].ToString() ;

}

imageList, listView


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imageList: Properties: Images,...

listView

Properties: Columns

Items (Items.Add(...), Items[i].SubItems[i]

SmallItemList

View, GridLine,

DialogResult MessageBox (text, caption,MessageBoxButtons)


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Hm kim tra xem c H tn trng nhau hay khng?


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bool Kiemtra(string ht){

for (int i = 0; i < listView1.Items.Count; i++)

if (listView1.Items[i].Text.Equals(ht))return false;

return true;

}

Kch vo nt Nhpprivate void butNhap_Click(object sender, EventArgs e)

{


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{

DialogResult kq=DialogResult.Yes;

bool kt = Kiemtra(textHoten.Text);if(!kt)kq = MessageBox.Show(" c nv ny, nhp thm hay

khng ?","Thng bo",MessageBoxButtons.YesNo) ;

if(kq==DialogResult.Yes ||kt==true){

string[] st = new string[3];

st[0] = textHoten.Text;

st[1] = textDiachi.Text;

st[2] = textGioiTinh.Text;ListViewItem lv = new ListViewItem(st);

listView1.Items.Add(lv);

}

}

timer, progressBar


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timerProperties:

Enable Interval

Methods:

Tick

progressBar Properties:

Maximum

Minimum Value

statusStrip


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150/272


DongHo TienTrinh DieuKhien

statusStrip

Lp trnh trn timer1_Tick()


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private void timer1_Tick(object sender, EventArgs e)

{ DateTime dh=DateTime.Now;

DongHo.Text = dh.ToLongTimeString() ;TienTrinh.Maximum = 60;

TienTrinh.Minimum = 0;

TienTrinh.Value = dh.Second;

}

colorDialog


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Properties: Color; method: ShowDialog

private void button1_Click(object sender, EventArgs e){

colorDialog1.ShowDialog();textBox1.ForeColor = colorDialog1.Color;

}

colorDialog


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Properties: Color; method: ShowDialog

private void button1_Click(object sender, EventArgs e){

colorDialog1.ShowDialog();textBox1.ForeColor = colorDialog1.Color;

}

fontDialog,saveFileDialog, openFileDialog


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Method: ShowDialog();

Properties:

Font FileName


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OpenFile


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private void butOpen_Click(object sender, EventArgs e){

try{

openFileDialog1.ShowDialog();StreamReader f=new

StreamReader(openFileDialog1.FileName);

textBox1.Text = f.ReadToEnd();

}catch(Exception e1){MessageBox.Show(e1.Message); }

}

SaveFile


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private void butSave_Click(object sender, EventArgs e){

try {

saveFileDialog1.ShowDialog();

StreamWriter f = new

StreamWriter(saveFileDialog1.FileName);

f.WriteLine(textBox1.Text);

f.Close();

}catch (Exception e1) { MessageBox.Show(e1.Message); }

}

Font


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private void butFont_Click(object sender, EventArgs e){

fontDialog1.ShowDialog();

textBox1.Font = fontDialog1.Font;

}

menuStrip


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M Form1:Form1 f = new Form1();f.Show();

toolStrip


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Data Binding

L s kt hp gia cc iu khin thit k giao din nh


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Cc iu khin giao din Cc ngun d liu

V d V d

ComboBox

DataBinding

L s kt hp gia cc iu khin thit k giao din nhTextBox, ListBox, vi cc ngun d liu nh DataSet,DataTable, Table, BindingSource,

Misthay i trn cc iukhin giao dinsnhhngnngundliu v ngcli

Data Binding


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To lp TaoBang Lp ny cha bng lm ngun d liupublic class TaoBang


163/272

public class TaoBang

{ //to bng PhanLoaipublic static DataTable dt = new DataTable("PhanLoai");

public TaoBang()

{ dt.Columns.Add("Maloai" ); //To ct MaLoai

dt.Columns.Add("TenLoai"); //To ct TenLoaifor(int i=1;i


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C 2 loi Binding:

- DataBinding n gin (Simple DataBinding): Timtthiim,mt gi trn trong ngundliu

c thbbuc vo btkmtiukhin.

Bucdliu vo TextBox: txt1

txt1.DataBindings.Add("Text", ngun,tntrng");

Khi mi thay i trn DataTable dt s nh

hngn TextBox txt1 v ngcli.

V d buc d liu vo TextBox


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private void Form1_Load(object sender, EventArgs e)

{

new TaoBang();

txtmaloai.DataBindings.Add("Text", TaoBang.dt, "maloai");txttenloai.DataBindings.Add("Text", TaoBang.dt, TenLoai");

}

Cc loi Binding (2)DataBindingphc tp (Complex DataBinding): Cc d liu trong


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ngund liubbuc vo mtiukhin thay v chmt gi tr

n. Chc DataGidView, ComboBox v listBox htrchcnng

DataBinding phctp.

- Dng cc thuc tnh: DataSource,DataMember hoc

DisplayMemberbuc vo cc iukhinV d: Gis c DataTable dt chadliubng PhanLoai:

listBox1.DataSource = dt; listBox1.DisplayMember = "TenLoai";

dataGridView1.DataSource = ds; dataGridView1.DataMember = "PhanLoai comboBox1.DataSource = ds; comboBox1.DisplayMember = "PhanLoai.TenLoai"; ";

Cc loi Binding (3)-Bucdliu vo dataGridView: dataGridView1


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- dataGridView1.DataSource = Ngundliu;

dataGridView1.DataMember = tn bng trong ngun

V d Buc d liu vo dataGridView: dataGridView1


{


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{

new TaoBang();txtmaloai.DataBindings.Add("Text", TaoBang.dt, "maloai");

txttenloai.DataBindings.Add("Text", TaoBang.dt, TenLoai");

dataGridView1.DataSource = TaoBang.dt;

}

TaoBang.dt

(PhanLoai)

Cc loi Binding (4)+ BucdliuvoListbox, Combox: Listbox1, Combox1

li tB 1 h C b 1 D t S d li


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listBox1 hoc Combox1 .DataSource = ngun d liu;

listBox1 hoc Combox1 .DisplayMember = Tn trng hin th"; listBox1 hoc Combox1 . ValueMember = Tn trng cha gi tr";+ Ly gi tr ca ValueMember:

listBox1 hoc Combox1 .SelectedValue+ Ly gi tr ca DisplayMember :

listBox1 hoc Combox1.Text

Buc d liu vo Listbox, Combox: Listbox1, Combox1


{ new TaoBang();


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{ new TaoBang();

txtmaloai.DataBindings.Add("Text", TaoBang.dt, "maloai");txttenloai.DataBindings.Add("Text", TaoBang.dt, TenLoai");

dataGridView1.DataSource = TaoBang.dt;

listBox1.DataSource = TaoBang.dt;

listBox1.DisplayMember = "tenLoai";

listBox1.ValueMember = "maloai";

comboBox1.DataSource = TaoBang.dt;comboBox1.DisplayMember = "tenLoai";

comboBox1.ValueMember = "maloai";

}

S dng BindingSource L con tr n ngun d liu


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S dng BindingSource buc d liu thay vdng ngun d liu

Dng BindingSource c th thm, xa, sa dliu trn ngun d liu.

.DataSource=ngun d liu

Nhp, xa, lu ngun d liu


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.AddNew() .RemoveCurrent()

. EndEdit()

V d BindingSource


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private void Form1_Load(object sender, EventArgs e){

new TaoBang();

bindingSource1.DataSource = TaoBang.dt;

txtmaloai.DataBindings.Add("Text", bindingSource1, "maloai");

txttenloai.DataBindings.Add("Text", bindingSource1, TenLoai");

dataGridView1.DataSource = bindingSource1;

}

private void butNhap_Click_1(object sender, EventArgs e)

{

bindingSource1 AddNew();


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bindingSource1.AddNew();

}

private void butXoa_Click(object sender, EventArgs e)

{

bindingSource1.RemoveCurrent();}

private void butLuu_Click(object sender, EventArgs e)

{

bindingSource1.EndEdit();

}

BindingContext Cch tng tc gia 1 ngundliuvittc cc iukhin

b buc trn form


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Nguyn Hong H - Khoa CNTT-HKH175

bbuc trn form

Mi Form u c mt thuc tnh BindingContext. MtBindingContext c mt tphp cc BindingManagerBase, cc

itng ny cto ra khi dliubuc vo mtiukhin.

Mt CurrencyManager c th duy tr mt v tr hin thi bn

trong ngundliu v khi v tr ny thay i th dliu trn cc

iukhinbbuc trn form stng thay i theo .

Mt CurrencyManagerchc to ra mt ln cho mtngun

dliu. Nu hai TextBox bbuc vo 1 dng ca DataTable khi

ch c mt CurrencyManager c to ra trong

BindingContext

BindingContext


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Nguyn Hong H - Khoa CNTT-HKH176

Gets hoc sets i tng hin thi trong danhsch cc i tng c qun l trongCurrencyManager

Position

Gi trca cc itnghinthi trong ngundliu

Current

S dng cqun l trong CurrencyManagerCount

Tp hp cc i tng Binding c qun lbi CurrencyManager

BindingsM tThuc tnh


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Gii thiu


178/272

LINQ (Language Integrated Query) l smrngca .Net Frame Work. N bao gmngn ng tch hp truy vn, l sm rng

C# v Visual Basic vi c php ngn ngring cho cc truy vn v cung cp cc thvin truy xutdliu.

V sao phi dng LINQ?


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Data IS Everywhere

ButData != Objects

Objects Data

V sao phi dng LINQ ?


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!=

Kin trc ca LINQ


181/272

LINQ to Objects: Cung cp cc khnng truy vnIEnumerable , da trn mng, collections v list

LINQ to XML: gip cho ngi lp trnh thao tc trn


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LINQ to XML: gip cho ngilp trnh thao tc trn

cc truy vn XPath / XQuery mt cch nhanh chngvhiuqu. LINQ to SQL: c s dng truy cp cc i

tngcsdliu quan hnh cc itng .NET.

LINQ to SQL tch hp SQL da trn cc nhnghacalc. Cung cp cch nh mnhm,kim trac php, IntelliSense trn cc itng SQL.

LINQ to DataSet: Cung cp cc khnng truy vn

ADO.NET Dataset. Linq to Entities: cung cpkhnng truy vn trn cc

thcth ADO.NET.


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Gii thiu


184/272

LINQ to SQL l mt phin bn hin thc ha caO/RM (object relational mapping) c bn trong .NETFramework 3.5, cho php m hnh ha mtcsdliu dng cc lp .NET. Sau bn cth truy vn

c s d liu (CSDL) dng LINQ, cng nh cpnht/thm/xa dliut.

LINQ to SQL htry transaction, view v ccstored procedure (SP). N cng cung cp mt cchd dng thm khnngkim tra tnh hplcadliu v cc quy tc vo trong m hnh dliu

To CSDL trong SQL SERVER 2005

CSDL ny c s dng v d trong bi


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CSDL ny c s dng v d trong bi

ging

Kt ni n CSDL- View -> Server Explorer

Kch phi chut ln DataConnection > Add Connection


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- Kchphichut ln DataConnection -> Add Connection

Hiu chnh ng kt ni trong fileWeb.config


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To ra m hnh d liu LINQ TO SQL

To ra lp DataContext


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Project -> Add New Item -> LINQ To SQLClasses -> ti Name g tn: QlNvDb.dbml

M ca s Server Explorer -> chn Table ->Gi phm Ctrl ngthichnttc cc bng ->ko cc bng ny vo ca s ca fileQlNvDb.dbml

To ra m hnh d liu LINQ TO SQL


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Cc thnh phn ca lp DataContext


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191/272



192/272



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Cc truy vn


194/272

Biu thc truy vn

Bin a phngkiu tham chiu

Biu thcLambda

Cc phngthc m rng Kiu nc danh Khi to cc i

tng


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Cc ton t trong LINQ TO SQL

Select


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Select manv, hoten from nhanvien

Take, Skip


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select top 2 manv, hoten from nhanvien

db.NhanViens.Skip(4).Take(2);

Ly v gi tr ca dng 5 v 6

Order by


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select manv, hoten, hesoluong fromnhanvien order by hesoluong desc

Distinct


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select distinct madonvi from nhanvien

var q = (from p in db.NhanViens

select new { madv=p.MaDonVi }).Distinct() ;

Where


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select manv, hoten, hesoluong from nhanvienwhere madonvi='dv1'

Where


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select manv, hoten, hesoluong from nhanvienwhere hoten like N%Nguyn%'

Join

select manv hoten tendonvi from donvi


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select manv, hoten, tendonvi from donvi

inner join nhanvien on donvi.madonvi=nhanvien.madonvi

Group

l t T D Vi (h l *830000) f d i i


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select TenDonVi,sum(hesoluong*830000) from donvi inner

join nhanvien on donvi.madonvi=nhanvien.madonvi

group by TenDonVi

var q = from dv in db.DonVisjoin nv in db.NhanViens on dv.MaDonVi equals nv.MaDonVi

group nv by nv.DonVi.TenDonVi into kqselect new{Madv=kq.Key ,

Tongluong=kq.Sum(t=>t.HeSoLuong*830000)};

Cc hm tp hp

l t (h l *830000) f h i


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select sum(hesoluong*830000) from nhanvien

Select avg(hesoluong) from nhanvien

Select count(*) from nhanvien

Select Max(hesoluong) from nhanvien

Select Min(hesoluong) from nhanvien

var l = db.NhanViens.Sum(nv => nv.HeSoLuong * 830000);

var tb = db.NhanViens.Average(nv => nv.HeSoLuong );

var snv = db.NhanViens.Count();var max = db.NhanViens.Max(nv => nv.HeSoLuong);

var min = db.NhanViens.Min(nv => nv.HeSoLuong);

Thm

Insert into nhanvien values('nv123',N'Nguyn Hong


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H','11/22/1976',1,3,'dv1')

Xa

D l t f h i h 1


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Delete from nhanvien where manv=nv1

Sa

d t h i t h l h l +1 h


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update nhanvien set hesoluong=hesoluong+1 where

madonvi='dv1'

S dng th tc v View

TimN l


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TimNv l

Chng 6


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LP TRNH NG DNG WEBVI ASP.NET

Ni dung


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Kin trc ca ng dng Web

Cng ngh pht trin ng dng Web

(ng) Kin trc

HTML

Web ng


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Ni dung c Web Server sinh ra khi c yucu t Client.

Ni dung hin th ti cc ln duyt khc nhau l

khc nhau. Rt ph dng: Hu ht cc trang web thng

mi u l web ng.

S dng ngn ng lp trnh sinh ra trangHTML.

S dng CSDL.

Web ng


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Web ng


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CSDL

WebServer

WebBrowser

DatabaseProvider

http://www....

Yu cu d liu

Thao tc CSDLD liu

D liu

Ni dung (HTML)

Cng ngh pht trin Web(ng)


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a dng v khng ngng c phttrin.

Microsoft:ASP, ASP.NET

Sun: Java Servelet, JSP.

Khc: PHP

ASP.NET - Kin trc


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ASPX

.ASPX

ASP.NET - Kin trc


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Client

(Browser)

ASP.DLL

IISVBScript

JavaScript

ActiveX Data

Objects

(ADO)

Database ASP file

ASP.NETc im


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Hngitng: Mi trang bao gm hai itngktha nhau. Tch m giao din (HTML) vi m x l bng

kthutCodebehind.

=> D vit chng trnh, tm li. => Giu c m (m c dch thnh DLL).

.aspx .aspx.cs

ASP.NETc im (2)


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Cc iu khin pha Server (server-sidecontrols).

=> C th x l tt c trn server.

ASP.NETc im (3)


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Cc iu khin pha Server (server-sidecontrols).

Auto PostBack cho tng iu khin => Bts kin trn iu khin n gin.

ASP.NETc im (3)


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Cc iu khin pha Server (server-side controls).Kim tra hp thc (validation)

Cn m Ty bin (CustomValidator) Khng cn m

Yu cu nhp (RequiredFieldValidator) Trong khong (RangeValidator) So snh (CompareValidator) Biu thc chung (RegularExpressionValidator)

HTML


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Khi nim

HTML (HyperText Markup Language) l ngn ngnhdngvnbn siu lin kt. Snhdngda

trn cc tab hoc cc on m cbitnhdumtvnbn,mt file nh ... gip cho Web Browerthng dch v hinth chng ln mn hnh. HTML cnhng phn m rng rt quan trng cho php

nhng lin kt hypertext tmt ti liu ny nmtti liu khc.

Cu trc c bn ca mt file HTML


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HTML

Gii thiu 1 s th HTML


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, , , ,

Tn lin kt

V d: Cc th HTML


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Cc iu khin pha Server


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Label

PROPERTIES

ID: tn ca LabelText: Tiu

TextBox


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PROPERTIES Events

ID

AutoPostBack

TextTextMode TextChanged

Button


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PROPERTIES Events

ID

Text

LinkButton


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PROPERTIES Events

ID

PostBackUrl

Th thao

Text

DropDownList (ListBox)


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PROPERTIES Events

ID

AutoPostBack

SelectedIndexChanged

Text

Np d liu DropDownList (ListBox)

.DataSource = list hoc DataTable;


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.DataValueField = Tn trng"; .DataTextField = Tn trng"; .DataBind();

CauHinh ch=new CauHinh(Server.MapPath(ds.txt"));LopHoc lh= new LopHoc();

DropDownList1.DataSource = lh.DtSinhVien;

DropDownList1.DataValueField = "masv";DropDownList1.DataTextField = "hoten";

DropDownList1.DataBind();

Image


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PROPERTIES

ID

ImageUrl

FileUpload


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PROPERTIES Methoad

ID

SaveAs

GridView


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.DataSource =List, DataTable

.DataBind()

CauHinh ch = new

CauHinh(Server.MapPath(ds.txt"));LopHoc lh = new LopHoc();

GridView1.DataSource = lh.DtSinhVien;GridView1.DataBind();

DataList


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.DataSource =list, DataTable;


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.DataBind();

CauHinh ch = newCauHinh(Server.MapPath(ds.txt"));

LopHoc lh = new LopHoc();

DataList1.DataSource = lh.DtSinhVien;

DataList1.DataBind();

V d

To trang HtSinhVien.aspx vi giao din:


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T ToolBox:

-To 2 Label

-1 DropDownList: vi tn DropDownList1,

thuc tnh AutoPostBack=true

-1 GridView vi tn GridView 1

Lp trnh trn s kin Page_Load ca trang np cc tn lp vo DropDownListprotected void Page_Load(object sender, EventArgs e)

{ if (!IsPostBack)

{ CauHinh ch = new CauHinh(Server.MapPath(ds.txt"));


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List lssv = lh.LstSinhvien;

List tam = new List();

for (int i = 0; i < lssv.Count; i++)

{ string tenlop = lssv[i].Tenlop;

int j;

for (j = 0; j < i; j++)

if (tenlop.Equals(lssv[j].Tenlop )) break;

if (j == i) tam.Add(lssv[i]);

}

DropDownList1.DataSource = tam;

DropDownList1.DataTextField = "tenlop";

DropDownList1.DataBind();

}

}

SelectedIndexChanged ca DropDownList tm sinh vin theo tn lp

protected void DropDownList1_SelectedIndexChanged(object sender,EventArgs e)

{


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CauHinh ch = new CauHinh(Server.MapPath("ttt.txt"));


List lssv = lh.LstSinhvien;

List tam = new List();

string tenlop = DropDownList1.Text ;

for (int i = 0; i < lssv.Count; i++)

{

if (tenlop.Equals(lssv[i].Tenlop))

tam.Add(lssv[i]);

}GridView1.DataSource = tam;

GridView1.DataBind();

}

}

To trang thongke.aspx

T ToolBox to 1ListBox hin th


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ttc cc tn lp- Khi chn 1 tn lp

trn ListBox s hinth cc sinh vin calp ny ra Gridview

- Khi chn nt Danhsch ln lpshinth danh sch ccsinh vin ln lp(tb>=5) ca lp

chn ListBoxx raGridView v hin ths sinh vin ln lp

- Tng t cho ntDanh sch sinhvin

LM VIC VI STYLESHEET


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CSS thc cht l mt tp cc qui tc format/ nh kiu (style) cho cc phn tc hin th v nh v trn trang web.

Nh vo CSS m vic nh dng (kiu)cho cc phn t tr nn d dng v linhhothnrtnhiu.



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Cc nh ngha v CSS c th c tngay trong tp ngun nhng cng c thc t ring ra mt tp khc. Tp ny

thng c ui m rng l css.


To 1 file CSS


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Web site -> AddNew Item ->

STYLESHEET -

> G tn file

Ni dung ca tp ch cha cc nh ngha CSS (Gm nhngha b chn th, chn ID, v lp).



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Kch chut phi trang -> Add Style Rule

Element: nh dng li cc th c ( V d a: hover)

Class name: To 1 lp mi (v d: .Mau)

Element Id: To 1 ID cc phn t c cng ID s nhdng ging nhau( v d: #TieuDe)



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Kch chut phi ln v tr cn nh dng -> AddStyle -> Chn mc cn nh dng nh hnh trn



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Np file Css vo trang: M trang ch Source

v dng th:


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php ta thitkiukhinda trn cc k thut m talp trnh trn trang ASP.NET.

Khi s dng UserControl, ta phi nhng chng votrang ASP.NET thay v thc thi mt mnh ging nh

trang ASP.NET, phn m rng ca UserControl lASCX.

Sau khi thit k xong UserControl ta chn chng t cas Solution Explored v ko th vo trang ASP.NET

qun l ta to mt th mc lu ccWebUserControl:

Web Site | New Folder| g tn th mc l UC

S DNG WEB USER CONTROL

1


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+ To ra 1 WebUserControl: Kch chut phi ln tnth mc UC | Add New Item | Web User Control |g tn WebUserControl | Add:


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CC I TNG ASP.NET

GII THIU

Active Server Pages (ASP): lkchbnchy pha Server, 1 W bS th l d l i


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cung cp 1 WebServer cthx l cc ngdng logic vtrv HTML cho browser.

Web Forms: Cung cp cc cng cthitkvsonthoForm

Design:hin th b cc ca trang Source:Hin th m t ng pht sinh khi to trang Web. Web.config: lfile XML cha cu hnh trong project. Global.asax lfile t chn c s dng thao tc trn

cc s kin mc ng dng. *.aspx, *.aspx.cs: Desgn, Codebehind

Th mc o


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Request and Response Resquest:

C S S


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Nhn yu cu t Client gi n Server khi nt Submitc nhn.

Khi nhn nt Submit th d liu ca cc iukhin bntrong Form scgin Server (Post).

nhn c d liu gi t Form (client):

Request.Form[tn iu khin]; nhn c tham s gi bng Get (Dng th ) Request.QueryString[tn tham s]);

Response:

Gi d liu t Client n Server Phng thc:

Write(d liu); Redirect(URL);

Request and Response


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Nhap.htm


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M Loi:

Tn Loi

NhapHtml.aspxprotected void Page_Load(object sender, EventArgs e)

{


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{

string ma = Request.Form["txtma"];

string ten = Request.Form["txtten"];

Response.Write("M Loai:" + ma);

Response.Write("
Tn Loi" + ten);

}

i tng ServerServer.property | methodC php


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HTMLEncode

MapPath

MachineName

Methods

cn = new OleDbConnection("provider=microsoft.jet.oledb.4.0;datasource=" + Server.MapPath("qlthuvien.mdb"));

Response.Write(alo);

Response.Write(Server.HtmlEncode(alo));

i tng Session

Lu tr cc thng tin ca ngi dngt 1 hi l i


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trong 1 phin lm vic. Binlutr trong Session khng b xo i

khi ngi dng chuyn t trang ny sang

trang khc. WebServer s t ng to ra khi ngi

dng yu cu 1 trang web, b gii phng

khi kt thc phin lm vic Session[tnbin ]= object

To lp Global khi to cc Session

Project -> Add New Item -> Global Application

Class


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Class

Khi to cc Session


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V d 1

Tomt Website sinh vin mn sch trong

th i bao cc WebPage:


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thvin bao gm cc WebPage: Qlthuvien.aspx: Cha giao din chnh Dangky.Aspx:ngnhp. Hienthi. Aspx: Hinthttc cc sch Mn. Asp: mn sch.

Yu cu: ngi s dng phi ng nhp mic xem hocmn sch.

Ta phi to ra 1 phin lm vic (Session) kim tra xem ngi dng ngnhpcha?

Qlthuvien.aspx

t t d id Li kB tt 3D Cli k( bj t d E tA )


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protected void LinkButton3Dn_Click(object sender, EventArgs e)

{

Response.Redirect("Dangky.aspx");

}protected void LinkButton1HT_Click(object sender, EventArgs e)

{

Response.Redirect("Hienthi.aspx");

}..

DangKy.aspx


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protected void ButDangNhap_Click(object sender, EventArgs e){

Session["ID"] = TextID.Text;

....

}

HienThi.aspx

protected void Page Load(object sender EventArgs e)


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protected void Page_Load(object sender, EventArgs e){

if (Session["Id"] == null || Session["Id"] == "")

Response.Redirect("~/Dangky.aspx");

//

}

Bi thc hnh (Session)To ra trang Web n gin mua hng trn mng:


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GridView1

To lp GioHang.cs nhp thm1 hng vo gi

public class Giohang

{ public DataTable dt = new DataTable("Hang");


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{ public DataTable dt = new DataTable( Hang );public Giohang()

{ dt.Columns.Add("TenHang");

dt.Columns.Add("Soluong");

}public void ThemGiohang(string th,string sl)

{ DataRow dr = dt.NewRow();

dr[0] = th;

dr[1] = sl;dt.Rows.Add(dr);

dt.AcceptChanges();

}

Lp trnh trn nt mua v gi hngprotected void butMua_Click(object sender, EventArgs e)

{

if (Session["gh"] == null)

gh = new Giohang();


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gh = new Giohang();

else

gh = (Giohang) Session["gh"];

gh.ThemGiohang(DropDownList1.Text, textSoluong.Text);

Session["gh"] = gh;}

protected void ButGioHang_Click(object sender, EventArgs e)

{ Giohang gh = (Giohang)Session["gh"];

if (gh != null) {GridView1.DataSource = gh.dt;

GridView1.DataBind();

}

}

Yu cu b sung To CSDL qlhang.mdb bao gmbng hang(mahang,tenhang,gia),

khachhang(hoten,diachi,tenhang,soluong,thanhtien).


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DropDownList1 Hin thttc cc tn hng cabng hng

Trong gi hng thm trngThanhTien=Slng * gi.

Kimtr xem trong gi hng nu c tn hng thtngslng, tnh li thnh tin.

To thm nt Thanh Ton: ngi dng nhph tn va

ch v chuyn tt c hng trong gi hng vo bng

Khachhang

Bin Application

Dng qun l cc bin c phm vi ton ngdng C tc dng n mi ngi dng


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dng. C tc dngnmingi dng.

Bin ton ngdng l bin c tc dngivimingi dng truy cp vo website. Mi trang

aspx u c th truy cpnbin ny v d btkthiim no.

Application[tn bin"] =

Khi to gi trbin trong Application_Start calp Global

LinqDatasource

T Data trn ToolBox chn 1 LinqDataSource


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Buc d liu vo GridView


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slidebaigiangc# va linq asp - winform-bài tập

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