错误C3918：错误诡计检查事件是nullptr [英] Error C3918: Error wile checking event for being nullptr

问题描述

我有委托和事件在我.h文件中

I have delegate and event in my .h file

delegate void ResponseReceivedHandler(System::Object^ sender, WhoisEventArgs^ e);
event ResponseReceivedHandler^ ResponseReceived; 

在某处我的code我想或者检查事件是 nullptr 没有，但是当我写

编辑：

if (this->ResponseReceived != nullptr)
{
     this->ResponseReceived(this, e);
}

时发生错误

错误1错误C3918：使用需要   VT :: WhoisClient :: WhoisRequest :: ResponseReceived   是一个数据   成员C：\ Users \用户ViToBrothers \桌面\ VITO   项目\ VT.WhoisClient \ VT.WhoisClient \ VT.WhoisRequest.cpp 50

Error 1 error C3918: usage requires 'VT::WhoisClient::WhoisRequest::ResponseReceived' to be a data member c:\Users\ViToBrothers\Desktop\ViTo Projects\VT.WhoisClient\VT.WhoisClient\VT.WhoisRequest.cpp 50

我该怎么办？

推荐答案

我认为，在这种情况下，编译器生成的存取功能和备份存储的事件处理程序委托。因此，没有必要为你检查空。

I believe that in this case, the compiler is generating the accessor functions and backing storage for the event handler delegate. Thus, it is not necessary for you to check for null.

详见这里： http://msdn.microsoft.com/en-美国/库/ 4b612y2s.aspx

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