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。

字符串。空和字符串。空的是等价的。String是BCL类名;字符串是它的c#别名(或快捷方式，如果你愿意)。与Int32和int相同。更多示例请参见文档。

至于“”，我不太确定。

就我个人而言，我总是使用string.Empty。

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。

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 ;-)