Declare a delegate and assigns a reference to either the WriteLine method or the ShowWindowsMessage method to its delegate instance. : delegate « delegate « C# / CSharp Tutorial






using System;
using System.Windows.Forms;

delegate void DisplayMessage(string message);

public class TestCustomDelegate
{
   public static void Main()
   {
      DisplayMessage messageTarget; 

      if (Environment.GetCommandLineArgs().Length > 1)
         messageTarget = ShowWindowsMessage;
      else
         messageTarget = Console.WriteLine;

      messageTarget("Hello, World!");   
   }      

   private static void ShowWindowsMessage(string message)
   {
      MessageBox.Show(message);      
   }
}








9.1.delegate
9.1.1.Define a delegate with no return value and no parameters
9.1.2.Add both static and non-static function to a delegate
9.1.3.Delegate with reference paramemters
9.1.4.Delegate with return values
9.1.5.Use a delegate to call object methods
9.1.6.delegate is a function pointer
9.1.7.A simple delegate example.
9.1.8.Construct a delegate using method group conversion
9.1.9.Delegates can refer to instance methods
9.1.10.Delegates to Instance Members
9.1.11.uses the invocation list to calculate a factorial
9.1.12.named-delegate invocation
9.1.13.Use delegate to reference two static functions
9.1.14.Declare a delegate and assigns a reference to either the WriteLine method or the ShowWindowsMessage method to its delegate instance.