Func<T,TResults> – Flexible delegate to create reusable functions

Today while googling i found an interesting feature of delegate Func<T,TResults> ,it allows us to represent a method that can be passed as a parameter without declaring a custom delegate explicitly and the method must have one parameter that is passed to it by value and must return a value.

In the following example we need to explicitly define a new delegate and assign a named method to it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BlogSamples
{
    delegate int ConvertMethod(int _x);
    class Program
    {
        static void Main(string[] args)
        {
            ConvertMethod objConv = SquareMe;
            int val = 5;
            //delegate is called
            Console.WriteLine(objConv(val));
            Console.ReadKey();
        }
        private static int SquareMe(int myInt)
        {
            return myInt * myInt;
        }
    }
}

Without explicitly defining a new delegate it can be simplified as below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BlogSamples
{
    class Program
    {
        static void Main(string[] args)
        {
            Func convertMethod = SquareMe;
            int val = 6;
            Console.WriteLine(convertMethod(val));
            Console.ReadKey();
        }
        private static int SquareMe(int myInt)
        {
            return myInt * myInt;
        }
    }
}

Please see the msdn link for more references.