Nullable DateTime是否正确？

问题描述

请检查以下代码

  抛出 Nullable< T> .GetType  这是因为 Object.Equals ， Object.GetHashCode 和 Object.ToString 被覆盖为 Nullable< T> ，但是 Object.GetType 不是（因为它不能它没有标记为 virtual ）。
 
Please check following code 
DateTime? tmp = new DateTime();
tmp = null;
return tmp.ToString();
It returns String.Empty.
Is it correct?
May be it will be better to rise exception in second line of code
 解决方案 
Yes, it's correct. From the documentation
Note also that Nullable<T>.Equals and Nullable<T>.GetHashCode do not throw in this case but that Nullable<T>.GetType does throw. This is because Object.Equals, Object.GetHashCode and Object.ToString are overridden for Nullable<T> but that Object.GetType is not (because it can not be as it is not marked as virtual).
                        
这篇关于Nullable DateTime是否正确？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！