Delegating ctors in WinRT type

Question

Hello, I'm trying to use delegating ctors(MSVS 2012 November CTP) with WinRT type:

DelegateCommand::DelegateCommand(ExecuteDelegate^ executeHandler):
    DelegateCommand(executeHandler, nullptr)
{
}
 
DelegateCommand::DelegateCommand(ExecuteDelegate^ executeHandler,
    CanExecuteDelegate^ canExecuteHandler):
    m_ExecuteDelegate(executeHandler),
    m_CanExecuteDelegate(canExecuteHandler)
{
    assert(m_ExecuteDelegate);
}

But it fails to compile with the following error:

error C2039: '<Dispose>' : is not a member of App::Common::DelegateCommand'

Is there a way to use delegating ctors with WinRT?

Answer 1

hi,ixSci

I wonder that whether your DelegateCommand being inherited from others?or it just a ref class?or it just from

 Microsoft.Practices.Composite.Presentation.Commands?I think C2039 <Dispose> can't expose the issue.

Then,I'm so grateful for you if you teach me your understand about Delegating ctors.In my mind,the class delegating is just used as parameter or callback or event,I have never thought I can do something with it ctors.

Answer 2

Declaration of the DelegateCommand class is as follows:

public ref class DelegateCommand sealed: Windows::UI::Xaml::Input::ICommand

Not sure about your question regarding delegating ctors but it is just a feature from the C++11. You can read about it there, for example

Answer 3

It's so useful!,thanks for your shared!

Answer 4

Hello,

There have been a number of bug fixes surrounding DelegateCommand. Is there a reason why you are still using the CTP? Can you try the RTM version with update 1 & 2 installed and let us know if it still reproduces?

Thanks,

James

---

Windows SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/

Answer 5

Hi James, November CTP is post-release update which added a few more C++11 features. So I have RTM version with all updates installed. I will wait for 2013 RTM and post bug if it still be there

Answer 6

Hello,

You can always feel free to file a bug on the Visual Studio Connect site (keep in mind this is not for WinRT APIs).

That said make sure under VS->help->about the version listed is: "11.0.60610.01 Update 3"

https://connect.microsoft.com/

Thanks,

James

---

Windows SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/