Define a delegate with no return value and no parameters : delegate « delegate « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. delegate
3. delegate

1. A delegate is an object that can refer to a method.
2. The method referenced by delegate can be called through the delegate.
3. A delegate in C# is similar to a function pointer in C/C++.
4. The same delegate can call different methods.
5. A delegate is declared using the keyword delegate.

The general form of a delegate declaration:

delegate ret-type name(parameter-list);

1. ret-type is return type.
2. The parameters required by the methods are specified in the parameter-list.

A delegate can call only methods whose return type and parameter list match those specified by the delegate's declaration.

All delegates are classes that are implicitly derived from System.Delegate.

using System;


delegate void FunctionToCall();

class MyClass
{
   public void nonStaticMethod()
   {
      Console.WriteLine("nonStaticMethod");
   }

   public static void staticMethod()
   {
      Console.WriteLine("staticMethod");
   }
}

class MainClass
{
   static void Main()
   {
      MyClass t = new MyClass();    
      FunctionToCall functionDelegate;
      functionDelegate = t.nonStaticMethod;           

      functionDelegate += MyClass.staticMethod;
      functionDelegate += t.nonStaticMethod;
      functionDelegate += MyClass.staticMethod;

      functionDelegate();
   }
}

nonStaticMethod
staticMethod
nonStaticMethod
staticMethod