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命名空间的设计目的是提供一种让一组名称与其他名称分隔开的方式。在一个命名空间中声明类的名称与另一个命名空间中声明的相同的类名称不冲突。
定义命名空间:命名空间的定义是以关键字namespace开始,后跟命名空间的名称。Using关键字:表明程序使用的是给定命名空间中的名称。
嵌套命名空间:命名空间可以被嵌套,即你可以在一个命名空间内定义另一个命名空间。
命名空间:默认是以当前项目的名称。
常用的命名空间:
Using System: 包含了定义数据类型,事件,事件处理程序等基本类
Using System.Data: 包含了提供数据访问功能的命名空间和类。
Using System.IO: 包含了数据流与读写相关功能的类。
Using System.Windows.Forms: 包含了Windows窗体开发所需要的工具窗体类。
Using System.Web: 包含了所有网站开发相关的命名空间和类。
<>在同一个项目中,引用命名空间:
<>在不同的项目中,引用命名空间:
点击引用,选择添加引用。选择项目,然后进行添加。
<>引用系统自身的命名空间:
点击引用,选择添加引用。选择程序集,然后进行添加。