在C＃中自动导入嵌套的命名空间 [英] Importing nested namespaces automatically in C#

问题描述

很抱歉，如果这个问题被问了。 我开始学习C＃，发现C＃不自动导入嵌套的命名空间。 我不明白：

Sorry if this question was asked already. I started studying C# and noticed that C# doesn't automatically import nested namespaces. I don't understand:

using System;

应该自动导入包含在System命名权的所有类？ 所以应该不用我来写

should automatically import all classes contained in the System namespace right? So there should be no need for me to write

using System.Windows.Form;

我会用Windows.Form明白，如果 甚至工作。但是，编译器无法解析吧！什么是的点使用系统;它之前呢？ 那么，为什么使用系统; 不导入 System.Windows 自动以及 System.Windows .Forms - 对不起，如果这个词导入错在这里..也许转移到全局命名空间是正确的术语

I would understand if using Windows.Form even worked. But the compiler could not resolve it! What is the point of the using System; before it then? So why does using System; not import System.Windows automatically as well as System.Windows.Forms - sorry if the word import is wrong here.. maybe move to global namespace is the right terminology.

推荐答案

C＃是不是Java。

C# is not Java.

一个 使用指令是用，所以你不必在一个类型的完全限定名称输入。这也有助于消除歧义类型名称（使用别名为实例）。

A using directive is used so you don't have to type in the fully qualified name of a type. It also helps with disambiguating type names (using aliases for instance).

在控制台的情况下，例如，你并不需要键入 System.Console 。

In the case of Console, for example, you don't need to type System.Console.

要理解一个命名空间和组件之间的区别是很重要的 - 一个命名空间是一个的逻辑的类型分组。一个组件是物理的类型分组。命名空间可以跨越组件。

It is important to understand the difference between a namespace and an assembly - a namespace is a logical grouping of types. An assembly is a physical grouping of types. Namespaces can span assemblies.

在引用的组件（这更像是在Java中导入一个包），你获得的所有的市民类型吧。为了使用一个类型需要唯一地识别它。这是通过命名空间做 - 的使用指令只是意味着你不必键入类型的完全限定名

When you reference an assembly (this is more like importing a package in Java), you gain access to all of the public types in it. In order to use a type you need to uniquely identify it. This is done through the namespace - the using directive simply means you don't have to type the fully qualified name of the type.

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