The empty string is like empty set just a name that everybody uses to call "". Also in formal languages strings created from an alphabet that have zero length are called the empty string. Both set and string have a special symbol for it. Empty string: ε and empty set: ∅. If you want to talk about this zero length string you will call it the empty string so everybody knows exactly what you are referring to. Now in case you name it the empty string why not use string.Empty in code, its shows the intention is explicit. Downside is that it’s not a constant and therefore not available everywhere, like in attributes. (It's not a constant for some technical reasons, see the reference source.)

如果你想恶作剧某人，在他们的代码中加入“‍”。这不是空字符串，它是“\u200D”。你不能用string.Empty欺骗别人。

我使用“”，因为它将在我的代码中被明显地涂成黄色……字符串。在我的Visual Studio Code主题中，空是白色的。我相信这对我来说最重要。

虽然差别非常非常小，但差别仍然存在。

""在String时创建一个对象。空则不然。但是这个对象只创建一次，如果代码中有另一个""，就会从字符串池中引用它。 String和String是一样的，但是我建议使用String。空(以及字符串。格式字符串。因为点表示法表示的是类，而不是操作符，而且类以大写字母开头符合c#编码标准。

我没有什么区别。最后一个是打字最快的:)

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 ;-)