c#中的?.Invoke，即問號點Invoke

轉自：https://hovertree.com/h/bjag/4dmf8x0u.htm

 

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

　　

上面代碼等價於：

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