在C＃中检查空字符串的最佳方法
检查空字符串的最佳方法是什么（我不是考虑在C＃中初始化！），考虑代码性能？（请参见下面的代码）
What is the best way for checking empty strings (I'm not asking about initializing!) in C# when considering code performance?(see code below)
string a;
// some code here.......
if(a == string.Empty)
或
if(string.IsNullOrEmpty(a))
或
if(a == "")
任何帮助将不胜感激。 ：）
any help would be appreciated. :)
请勿将字符串与 String.Empty 或 检查空字符串。
Do not compare strings to String.Empty or "" to check for empty strings.
相反，使用 String.Length == 0
Instead, compare by using String.Length == 0
string.Empty 和 之间的差异很小。 String.Empty 不会创建任何对象，而 会在内存中创建一个用于检查的新对象。因此string.empty在内存管理中更好。
但是与 string.Length == 0 的比较将更快，并且是检查空字符串的更好方法。
The difference between string.Empty and "" is very small. String.Empty will not create any object while "" will create a new object in the memory for the checking. Hence string.empty is better in memory management.
But the comparison with string.Length == 0 will be even faster and the better way to check for the empty string.