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Delegates and events in C#.Net

edited August 2014 in C#

how to use delegates and events in C#? Although I have read on the Internet and made tutorials. I can't understand. So please tell and point me good examples as possible as with Myanmar Language. Thank you.



  • Administrators

    tutorial လေးကို ဖတ်လိုက်ရင် နားလည်လွယ်ပါတယ်။

    using System;
    using System.IO;
    namespace DelegateAppl
       class PrintString
          static FileStream fs;
          static StreamWriter sw;
          // delegate declaration
          public delegate void printString(string s);
          // this method prints to the console
          public static void WriteToScreen(string str)
             Console.WriteLine("The String is: {0}", str);
          //this method prints to a file
          public static void WriteToFile(string s)
             fs = new FileStream("c:\\message.txt",
             FileMode.Append, FileAccess.Write);
             sw = new StreamWriter(fs);
          // this method takes the delegate as parameter and uses it to
          // call the methods as required
          public static void sendString(printString ps)
             ps("Hello World");
          static void Main(string[] args)
             printString ps1 = new printString(WriteToScreen);
             printString ps2 = new printString(WriteToFile);

    အဲဒီ code လေးကို ကြည့်လိုက်တာနဲ့ C# က delegate ဆိုတာ ဘာလဲ ဆိုတာကို အနည်းငယ် သဘောပေါက်နိုင်မယ်ထင်တယ်။

    Delegate နဲ့ interface က ရောထွေးတတ်တယ်။

    Use a delegate when:
    - An eventing design pattern is used.
    - It is desirable to encapsulate a static method.
    - The caller has no need access other properties, methods, or interfaces on the object implementing the method.
    - Easy composition is desired.
    - A class may need more than one implementation of the method.
    Use an interface when:
    - There are a group of related methods that may be called.
    - A class only needs one implementation of the method.
    - The class using the interface will want to cast that interface to other interface or class types.
    - The method being implemented is linked to the type or identity of the class: for example, comparison methods.

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