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Sunday, February 23, 2014

Delegates in C#.Net




In this post we will discuss about delegates in C#.net.

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- Delegates allow you to create a variable that points to a method. Then use this variable at any time to invoke the method.

- First define the signeture like the method must have the same return type, the same number of parameters, and the same data type for each parameter as the delegate.

- A delegate variable can point only to a method that matches its specific signature. The method must have the same return type, the same number of parameters, and the same data type for each parameter as the delegate.

- private string GetMeaning(string word)
{

}

This method accepts a single string argument and returns a string.

Now declare the delegate as like below:
Syntax:
public delegate <Return type> delegate name(parameters)

private delegate string MyFunction(string inputString);

Now in the next step we have to declare the variable like below:

MyFunction myDelegateVariable;
myDelegateVariable = GetMeaning;

Now you can invoke the method through the delegate like below:
string strValue;
strValue = myDelegateVariable("AspDotNetHelp.com");

Multicast Delegate:
It is a delegate which holds the reference of more than one method.
Multicast delegates must contain only methods that return void, else there is a run-time exception.



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