(2) c# language feature that you need to know - second session.

本文介绍了C#中的扩展方法与部分方法的概念及使用方法。扩展方法允许开发者为现有类型添加新方法,而无需修改该类型的源代码;部分方法则提供了在编译时可以选择性地实现的方法定义,用于代码清理和避免警告。

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( Following the first session...)

 

g) Extension Method

 

    Declaration: Use "this" keyword before the first parameter of a method. Then the first parameter will represent the type of a data that you may want to use. And its behavaior looks like a instance of a particular object instance.

 

    Code like below:

 

 

Others about extension: Extension method is enable the developer to extend a class which can not be modified. Or a develop was isolate for the source code.

 

h) Partial Method

 

(1) Partial Method can be only defined or implemented in partial class.

(2) Must use keyword "partial" to sepecify a partial method.

(3) Partial Method is private, but you cannot use private to modify your method, otherwise a compile error will be generated.

(4) Partial Method must return void type.

(5) Partial Method can be a declaration without being implemented.

(6) Partial Method can be a static method.

(7) Can take some parameters.

 

A simple demo like below, and please get the output result?

 

( Continuie tomorrow... )

( Good evening! )

 

 

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