C# - Anonymous Methods - Adglob Infosystem Pvt Ltd

We discussed that delegates are used to reference any C# Anonymous Methods that have the same signature as that of the delegate.

Anonymous methods provide a technique to pass a code block as a delegate parameter. Anonymous methods are the methods without a name, just the body.

You need not specify the return type in an anonymous method;

Writing C# Anonymous Methods

Anonymous methods are declared with the creation of the delegate instance, with a delegate keyword. For example,

delegate void NumberChanger(int n);
...
NumberChanger nc = delegate(int x) {
   Console.WriteLine("Anonymous Method: {0}", x);
};

The code block Console.WriteLine(“Anonymous Method: {0}”, x); is the body of the anonymous method.

For example,

nc(10);

Example

The following example demonstrates the concept −

using System;

delegate void NumberChanger(int n);
namespace DelegateAppl {
   class TestDelegate {
      static int num = 10;
      
      public static void AddNum(int p) {
         num += p;
         Console.WriteLine("Named Method: {0}", num);
      }
      public static void MultNum(int q) {
         num *= q;
         Console.WriteLine("Named Method: {0}", num);
      }
      public static int getNum() {
         return num;
      }
      static void Main(string[] args) {
         //create delegate instances using anonymous method
         NumberChanger nc = delegate(int x) {
            Console.WriteLine("Anonymous Method: {0}", x);
         };
         
         //calling the delegate using the anonymous method 
         nc(10);
         
         //instantiating the delegate using the named methods 
         nc =  new NumberChanger(AddNum);
         
         //calling the delegate using the named methods 
         nc(5);
         
         //instantiating the delegate using another named methods 
         nc =  new NumberChanger(MultNum);
         
         //calling the delegate using the named methods 
         nc(2);
         Console.ReadKey();
      }
   }
}

The following result −

Anonymous Method: 10
Named Method: 15
Named Method: 30

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