C# Anonymous Methods

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.

Let us see how to declare Anonymous methods in C# −

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

Example

The following is an example to implement Anonymous methods in C#.

using System;
delegate void NumberChanger(int n);
namespace DelegateAppl {
   class Demo {
      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();
      }
   }
}

Output

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