C# sa1200 是否所有 using 指令都必须放在命名空间（StyleCop）内纯粹是装饰性的？
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Is sa1200 All using directives must be placed inside the namespace (StyleCop) purely cosmetic?
提问by Matt
Possible Duplicate:
Should Usings be inside or outside the namespace
可能的重复：
Usings 应该在命名空间内部还是外部
sa1200 All using directives must be placed inside the namespace (StyleCop)
sa1200 所有 using 指令都必须放在命名空间内 (StyleCop)
Is this just for code readibility or is there any actual advantage to doing so? Does it help the GC somehow?
这只是为了代码可读性还是这样做有什么实际好处？它以某种方式帮助GC吗？
采纳答案by SolutionYogi
It definitely won't help with GC.
它绝对不会对GC有帮助。
Here's the discussion about two styles:
下面是关于两种风格的讨论：
http://blogs.msdn.com/abhinaba/archive/2006/08/21/709051.aspx
http://blogs.msdn.com/abhinaba/archive/2006/08/21/709051.aspx
回答by Reed Copsey
There is no runtime difference. It's purely a compile time (and development experience) change. The file, compiled IL will be identical in either case.
没有运行时差异。这纯粹是编译时（和开发经验）的变化。在任何一种情况下，编译的 IL 文件都是相同的。
回答by Brad Bruce
If you have multiple namespaces in your project, you can limit which namespaces are used by each one individually.
如果您的项目中有多个命名空间，您可以限制每个命名空间单独使用哪些命名空间。
This might come in handy if there were class names in two different namespaces that were the same. One might be the default in one part of your project, while the other could be the default in another.
如果两个不同的命名空间中有相同的类名，这可能会派上用场。一个可能是项目某一部分的默认值，而另一个可能是另一部分的默认值。
Yes they look for some really fringe cases for these rules.
是的，他们为这些规则寻找一些非常边缘的案例。
