c#中的?.Invoke，即问号点Invoke

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public delegate void OperateSuccessHanlder(string fileName); //创建委托 public event OperateSuccessHanlder OperateSuccess; //UCPictureAdd.ascx.cs中的代码 void OnOperateSuccess(string fileName)         {             OperateSuccess?.Invoke(fileName);         }

　　

上面代码等价于：

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public delegate void OperateSuccessHanlder(string fileName); //创建委托 public event OperateSuccessHanlder OperateSuccess; //UCPictureAdd.ascx.cs中的代码 void OnOperateSuccess(string fileName)         {            if(OperateSuccess!=null)             {                 OperateSuccess(fileName);             }         }