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);
        }其实等价于：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);
            }
        }