Стандартна бібліотека класів c#

1. Колекції. System.Collections, System.Collections.Generic. 2. Що таке Generic? Extension methods.3. Nullable<T>, “type?”4. Path5. DriveInfo6. Directory7. File8. Streams9. Serialization\deserializations10. Encodings11. DateTime, TimeSpan12. Regex13. Math

Зміст

Collections

Collections.Generic:

• Dictionary<TKey, TValue>

• List<T>

• Queue<T>

• Stack<T>

• LinkedList<T>

http://msdn.microsoft.com/en-us/library/system.collections.aspx - Collectionshttp://msdn.microsoft.com/en-us/library/0sbxh9x2.aspx - Collections.Generic

Collections:

• Hashtable

• ArrayList

• Queue

• Stack

Generics

http://msdn.microsoft.com/en-us/library/ms379564(v=vs.80).aspx

• Generic methods: • FirstOrDefault<T>(T[] array)• FirstOrDefault<T>(T[] array, T defaultValue)

• Type inference:• int first = FirstOrDefault(new[] {3, 2, 1});

• default(T) expression

• Type constraints:• Base type, class, struct, new()

• Generic types:• Example: List<T>

Extension methods

http://msdn.microsoft.com/en-us/library/bb383977.aspx

Simply static methods

Used for convenience

Nullable<T>

int? = Nullable<int>

Useful properties:• HasValue• Value

http://msdn.microsoft.com/en-us/library/b3h38hb0.aspx

Path

http://msdn.microsoft.com/en-us/library/system.io.path_methods.aspx

• Path.Combine(path1, path2)

• Path.GetDirectoryName(path)

• Path.GetFileName(path)

• Path.GetExtension(path)

• Path.GetFullPath(path)

• Path.GetRandomFileName()

• Path.GetTempFileName()

• Path.GetTempPath()

DriveInfo

http://msdn.microsoft.com/en-us/library/system.io.driveinfo.aspx

• DriveInfo.GetDrives()

• drive.DriveType {CDRom, Fixed, Unknown, Network, Removable ….}

• drive.DriveFormat {NTFS, FAT32}

• drive. AvailableFreeSpace

Directory

http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

• Directory.Create(folderPath)

• Directory.Move(folderPath, destinationPath)

• Directory.Delete(folderPath) && Directory.Delete(folderPath, true/*recursive*/)

• Directory.Exists(folderPath)

• Directory.GetFiles(folderPath, [search pattern])

File

http://msdn.microsoft.com/en-us/library/system.io.file.aspx

• File.Create(filePath)

• File.Move(filePath, filePathDestination)

• File.Copy(filePath, filePathDestination)

• File.Delete(filePath)

• File.Exists(filePath)

• File.WriteAllText(filePath, text)

• File.WriteAllBytes(filePath, bytes)

• File.AppendText(filePath, text)

• File.ReadAllText(filePath)

• File.ReadAllBytes(filePath)

Streams

http://msdn.microsoft.com/en-us/library/system.io.stream.aspx - Streamhttp://msdn.microsoft.com/en-us/library/system.io.filestream.aspx - FileStream

• stream.Read(data, offset, count)• stream.Write(data, offset, count)• stream.Length• stream.Seek(offset, SeekOrigin)• stream.Close()

• StreamWriter – easy way to write into text files.• StreamReader – easy way to read text from files.

• FileStream – easy way to work with binary files.

Create FileStream:• constructor (new FileStream(path, FileMode, FileAccess))• File.Create• File.Open• File.Write

Stream

MemoryStream

FileStream

CryptoStream

Binary serialization

http://msdn.microsoft.com/en-us/library/72hyey7b(v=vs.80).aspx

[Serializable]public class MyObject{ public int n1 = 0; public int n2 = 0; public String str = null;}

MyObject obj = new MyObject();obj.n1 = 1;obj.n2 = 24;obj.str = "Some String";IFormatter formatter = new BinaryFormatter();Stream stream = new FileStream("MyFile.bin", FileMode.Create, FileAccess.Write, FileShare.None);formatter.Serialize(stream, obj);stream.Close();

IFormatter formatter = new BinaryFormatter();Stream stream = new FileStream("MyFile.bin", FileMode.Open, FileAccess.Read, FileShare.Read);MyObject obj = (MyObject)formatter.Deserialize(stream);stream.Close();

Serizalization

Deserizalization

XML serialization

http://msdn.microsoft.com/en-us/library/90c86ass(v=vs.80).aspx

public class MyObject{ public int n1 = 0; public int n2 = 0; public String str = null;}

MyObject obj = new MyObject();obj.n1 = 1;obj.n2 = 24;obj.str = "Some String";XmlSerializer serializer = new XmlSerializer(typeof(MyObject));Stream stream = new FileStream("MyFile.bin", FileMode.Create, FileAccess.Write, FileShare.None);serializer.Serialize(stream, obj);stream.Close();

XmlSerializer serializer = new XmlSerializer(typeof(MyObject));Stream stream = new FileStream("MyFile.bin", FileMode.Open, FileAccess.Read, FileShare.Read);MyObject obj = (MyObject)serializer.Deserialize(stream);stream.Close();

Serizalization

Deserizalization

DateTime

• DateTime – представляє значення дати та часу.• DateTime.Add(timeSpan)• DateTime.AddDay(number)….• DateTime.ToString(format) (hh:mm:ss)• ToLocalTime()• ToUniversalTime()• DateTime.Now• DateTime.UtcNow• …

• TimeSpan – представляє інтервали дати та часу.• TimeSpan.TotalMilliseconds• TimeSpan.Days• TimeSpan.TotalDays• …

http://msdn.microsoft.com/en-us/library/system.datetime.aspx - DateTimehttp://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx - Custom DateTime Formats

Encoding

http://msdn.microsoft.com/en-us/library/system.text.encoding.aspx

• Encoding.Default• Encoding.Unicode• Encoding.ASCII• Encoding.UTF32• …• Encoding.Convert(sourceEncoding, destinationEncoding, bytes)

• encoding.GetBytes(string)• encoding.GetString(bytes)

Regex

Email pattern: “\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b”

• Regex.IsMatch(pattern, string)

• Regex.Replace(pattern, string, newValue)

http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex.aspx

Math

http://msdn.microsoft.com/en-us/library/system.math.aspx

• Math.Abs(number)

• Math.Pow(number)

• Math.Sin(angle)

• Math.Cos(angle)

• Math.Max(number1, number2)

• Math.Min(number1, number2)

• …