Cheap and interesting trick:
Convert.ToString((object)stringVar) == ""
This works because Convert.ToString(object) returns an empty string if object is null.
注意!!!
Convert.ToString(string) returns null if string is null.
(Or, if you’re using .NET 2.0 you could always use String.IsNullOrEmpty.)
其实以上的代码还可以再优化一点点:
根据FxCop的建议,我们应该使用
Convert.ToString((object)stringVar).Length==0
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