Question

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What are Extension Methods?

Hi,
After googlin got to know a bit about Extension methods but not very clear why we need to use extension methods and how does it work?

Please suggest.

Thanks,
Subhen

Answer 1

What is an extension method ?

Refer to this question – What are Extension Methods?

Why do we need to use it ?

Somehow, I don't agree to the idea of using extension methods to extend an existing type since practically this is impossible. The only reason why you want to use extension method is to bring fluency and readabilty on any type.

Check this code..

string str = "Hello world";
string result = Helper.Method2(Helper.Method1(str));

This code with extension methods can be written as below.

string str = "Hello world";
string result = str.Method1().Method2();
//compiler ultimately compiles this code as Helper.Method2(Helper.Method1(str));

which one is more fluent and readable ? The one with the extension methods.