http://blogs.msdn.com/b/brada/archive/2003/04/22/49997.aspx:

As David implies, there difference between String.Empty and "" are pretty small, but there is a difference. "" actually creates an object, it will likely be pulled out of the string intern pool, but still... while String.Empty creates no object... so if you are really looking for ultimately in memory efficiency, I suggest String.Empty. However, you should keep in mind the difference is so trival you will like never see it in your code... As for System.String.Empty or string.Empty or String.Empty... my care level is low ;-)

我个人更喜欢“”，除非有很好的理由去做更复杂的事情。

编译器应该让它们在长期运行时都是一样的。选择一个标准，这样你的代码就容易阅读，并坚持下去。

我本来不想插嘴的，但我发现这里有一些错误的信息。

我个人更喜欢字符串。这是个人喜好，我会根据具体情况服从与我合作的任何团队的意愿。

正如其他人所提到的，字符串和字符串之间根本没有区别。Empty和String.Empty。

此外，这是一个鲜为人知的事实，使用“”是完全可以接受的。在其他环境中，“”的每个实例都将创建一个对象。然而，. net会实习它的字符串，因此未来的实例将从实习池中提取相同的不可变字符串，任何性能损失都可以忽略不计。来源:布拉德·艾布拉姆斯。

I strongly prefer String.Empty, aside from the other reasons to ensure you know what it is and that you have not accidentally removed the contents, but primarily for internationalization. If I see a string in quotes then I always have to wonder whether that is new code and it should be put into a string table. So every time code gets changed/reviewed you need to look for "something in quotes" and yes you can filter out the empty strings but I tell people it is good practice to never put strings in quotes unless you know it won't get localized.

我喜欢用绳子。空字符串。空的，因为你可以使用它而不需要包含一个using System;在你的档案里。

至于在字符串上选择“”。空，这是个人喜好，应该由你的团队决定。