A
delegate in C# is similar to a function pointer in C or C++. Using a delegate
allows the programmer to encapsulate a reference to a method inside a delegate
object. The delegate object can then be passed to code which can call the
referenced method, without having to know at compile time which method will be
invoked
so
A function can have one or more parameters of different data types, but what if
you want to pass a function itself as a parameter? How does C# handle the
callback functions or event handler? The answer is - delegate.
A
delegate can be declared using delegate keyword followed by a function
signature as shown below.
Syntax:
<access
modifier> delegate <return type>
<delegate_name>(<parameters>)
|
Syntax
Example
public
delegate void Print(int value);
|
Example
using System;
using
System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
// Declaration
public delegate void SimpleDelegate();
class TestDelegate
{
public static void MyFunc()
{
Console.WriteLine("Hi , Nitin kumar, I
am MyFunc() function and i was called by delegate ...");
}
public static void Main()
{
// Instantiation
SimpleDelegate simpleDelegate = new SimpleDelegate(MyFunc);
// Invocation
simpleDelegate();
Console.Read();
}
}
}
|
OutPut :
