C# 0 The Complete Reference

Func 

indicates the delegate type. This form 

of

Func

 specifies two parameters of type 

int

 and a return type of 

bool

. This is the form of 

Func

 that is compatible with the lambda expression used in the program because that 

expression requires two parameters. Other lambda expressions may require different forms 

of

Func

, based on the number of parameters they require. In general, the specific form of 

Func

 must match the requirements of the lambda expression.

Exte

nsion Methods

As mentioned earlier, extension methods provide a means by which functionality can be 

added to a class without using the normal inheritance mechanism. Although you won’t 

often create your own extension methods (because the inheritance mechanism offers a 

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