本机类是否可以使用.NET事件？

Question

任何想法如何初始化从"混合"类实例指向方法的.NET委托？

我有'混合'这样的C++类:

class CppMixClass
{
public:
    CppMixClass(void){
        dotNETclass->StateChanged += gcnew DotNetClass::ServiceStateEventHandler(&UpdateHealthState);
    }
   ~CppMixClass(void);
   void UpdateState(System::Object^ sender, DotNetClass::StateEventArgs^ e){
       //doSmth
   }
}

DotNetClass在C#中实现,方法声明在委托中是可以的.此行生成错误:

dotNETclass->StateChanged += gcnew DotNetClass::ServiceStateEventHandler(&UpdateHealthState);
error C2276: '&' : illegal operation on bound member function expression

任何人都有关于问题的线索？也许coz CppMixClass类不是纯.NET(ref)类？

当UpdateHealthState是静态方法时,我得到了这个,但我需要指向实例方法的指针.

我试过像:

dotNETclass->StateChanged += gcnew DotNetClass::ServiceStateEventHandler(this, &UpdateHealthState);

但这显然不起作用因为这不是.NET(ref)类(System :: Object)的指针(句柄).

ServiceStateEventHandler在C#中定义为:

public delegate void ServiceStateEventHandler(object sender, ServiceStateEventArgs e);

Thanx读这个:)

Answer 1

我刚刚找到答案(当然是Nishant Sivakumar,人似乎对我所有的C++/CLI互操作相关问题都有答案):

http://www.codeproject.com/KB/mcpp/CppCliSupportLib.aspx?display=Print

答案位于"msclr/event.h"标头中,其中定义了本机类中委托的宏.

尼什的代码如下:

class Demo5
{
msclr::auto_gcroot<FileSystemWatcher^> m_fsw;
public:
// Step (1)
// Declare the delegate map where you map
// native method to specific event handlers

BEGIN_DELEGATE_MAP(Demo5)
    EVENT_DELEGATE_ENTRY(OnRenamed, Object^, RenamedEventArgs^)
END_DELEGATE_MAP()

Demo5()
{
    m_fsw = gcnew  FileSystemWatcher("d:\\tmp");
    // Step (2)
    // Setup event handlers using MAKE_DELEGATE
    m_fsw->Renamed += MAKE_DELEGATE(RenamedEventHandler, OnRenamed);
    m_fsw->EnableRaisingEvents = true;
}
// Step (3)
// Implement the event handler method

void OnRenamed(Object^, RenamedEventArgs^ e)
{
    Console::WriteLine("{0} -> {1}",e->OldName, e->Name);
}
};