Huge description of delegates

Posted Date: 01 Dec 2008	Resource Type: Articles	Category: ASP.NET/Web Applications
Author: gowthami chowdary	Member Level: Gold
Rating:	Points: 7

A delegate is used to represent any function.Delegates are similar to function pointers in c++.We use delegate keyword to create a delegate.To work with delegate we use the following steps:

1.create a delegate
2.Instantiate a delegate
3.Invoke a delegate

EX: If we take a function like

public void display(string s)
{

}

If we want to use a delegate, to refer the above function then we use the following steps.
1.Create a delegate:

Syntax:
Access modifier delegate return type delegate name([arg])

ex:
public delegate void sample delegate (string s)

when we create a delegate:
Access modifier,return type, number of arguments and their data types of the delegates must and should be same as the function that we want to refer.

2.Instantiate delegate:

syntax:

delegate name object name = new delegate name(target function name);

ex:

sample delegate obj=new sample delegate(display);

3.Instantiate the delegate:

syntax:

delegate object([argument value]);

ex:

obj("welcome");

Types of delegates:

1.Single caste delegates
2.Multi cast deligate

If a delegate is used to represent a single function then delegation is known as single caste delegate.

If a delegate is used to represent more than one function then it is known as multi caste delegate.

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