Home/ Questions/Q 5932803
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-22T14:53:08+00:00

I have delegate and event in my .h file delegate void ResponseReceivedHandler(System::Object^ sender, WhoisEventArgs^

  • 0

I have delegate and event in my .h file

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

somewhere in my code I want to check if event is nullptr or no, but when I write

EDITED: 

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

Error occurred

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

What can I do ?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    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.

    See more here: http://msdn.microsoft.com/en-us/library/4b612y2s.aspx

    • 0