Handles keyword in C++/CLI ?

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Hello guys. Sorry if my question is too basic, but I haven't found the answer.
I have a VB.NET class which is compiled in a DLL:

VB

Public class PiArc

    Dim m_EnableEvents as Boolean

    Private Sub m_Modified()
        If m_EnableEvents = True Then
            RaiseEvent OnModify()
        End If
    End Sub

    Public Event OnModify()
end class

And I have a C++/CLI class in a different dll, which is derived from the first:

C++

public ref class GfxArc : public Geometry::PiArc{
public:
    GfxArc(){ //constructor
        //ALL I need is to attach a handler the event raised in the (base)object.
    };
    void onRefreshProperty(){
         //REFRESH stuff
    };
};

I need to attach a handler to the event defined in the base class.
In VB.NET it's simple, you just use the Handles keyword to attach an event handler. Is this also possible in C++/CLI? How?
Thank you

Posted 14-Feb-12 6:43am

peto2242

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Nish Nishant · Answer 1 · 2012-02-14T06:48:00

Solution 1

It's fairly straightforward, see this MSDN article:

http://msdn.microsoft.com/en-us/library/ms235237(v=vs.100).aspx[^]

That said, since this is a parent-class - child-class situation, you may also want to look at making it a virtual method in the base class and then overriding it in the derived.

Posted 14-Feb-12 6:48am

Nish Nishant

Updated 14-Feb-12 6:50am

v2

Comments

Sergey Alexandrovich Kryukov 14-Feb-12 13:01pm

Correct, a 5.
--SA

peto2242 · Answer 2 · 2012-02-15T00:26:00

C++

public ref class GfxArc : public Geometry::PiArc{
public:
    void onRefreshProperty(){
         //REFRESH stuff
    };

    GfxArc(){ //constructor
        this->OnModify += gcnew Geometry::PiArc::OnModifyEventHandler( this, 
                          &GfxArc::onRefreshProperty );
    }; 
};

When you make an event in VB.NET, an event handler in the background is made (OnModifyEventHandler in this case).
I spent half a day until I found this out.