Tuesday, 28 January 2014

Action and Func in C#

In this post we are going to see Action and Func. Action will have a reference of  method with out return type, function have return type as last parameter.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            /* Action Sample */
            Console.WriteLine("*** Action sample ***");
            Action read = ReadData;
            Action write = WriteData;
            ExecuteActions(new List<Action>() { read,write});

            Console.WriteLine();
            Console.WriteLine("*** Func Sample ***");
            /* Function samples */
            Func<string> returnmethod = Sam;
            Func<string, string> empfunc = Name;
            Console.WriteLine(returnmethod.Invoke());
            Console.WriteLine(empfunc("Rajesh"));
            Console.Read();
        }

        public static string Sam()
        {
            return "Sample";
        }

        public static string Name(string name)
        {
            return "Employee " + name;
        }

        public static void ExecuteActions(List<Action> actions)
        {
            foreach (Action act in actions)
            {
                act.Invoke();
            }
        }

        public static void ReadData()
        {
            Console.WriteLine("Read Data : Started ");
        }

        public static void WriteData()
        {
            Console.WriteLine("Write Data : Started");
        }

    }
}



Output :-
*** Action sample ***
Read Data : Started
Write Data : Started

*** Func Sample ***
Sample
Employee Rajesh


From this article you can learn how to use action and func

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