提高C ++ / CLI DLL事件，并在C＃中消耗 [英] raise events in c++/cli dll and consume in c#

问题描述

在我的C＃应用​​程序我有一个进度条。 C＃应用程序中调用C ++ / CLI DLL用于处理大量的文件。当每个文件在DLL处理，我想跟踪它在C＃应用程序的进展。为了这个，我需要提高的C ++ / CLI事件，并在C＃中使用它。从MSDN我收集我需要在我的C ++ / CLI类以下内容：

 委托无效德尔（INT）; 
事件德尔^ E; 
无效火（int i）以{
 E（I） 
} 
  

的 MSDN活动

在MSDN事件的接收器是在同一个C ++ / CLI的项目，它是展示了如何引发事件。在我的项目，在C＃应用程序是接收应在C ++ / CLI每个文件处理后引发的事件。我GOOGLE了很多太多，但一直没能弄明白呢。所以，我的问题是，如何提高C ++ / CLI这个事件，如何将我的C＃程序连接到它？一些代码，显示做的方式，将不胜感激。
的感谢！

马特，
感谢响应。
在C＃中我试图

  MW.Class1 OM =新MW.Class1（）; 
 oM.fire + = ProgressBarChanged（INT I）; 
  

这并不编译说不能分配，因为火是方法组。我也有我的C＃程序，处理程序

 公共无效ProgressBarChanged（int i）以
 {
 
} 
  

这确实更好，虽然编译器说INT预计不会，不会编译

  oM.fire + =新的EventHandler（ProgressBarChanged（int i）以）; 
  

解决方案

随着错误消息指出，火是一个方法，而不是一个事件。呼叫 + = 上的事件，并留下关闭（）当你引用事件处理方法。

  oM.E + = this.ProgressBarChanged; 
  

至于触发事件，你在做正确的：只需拨打您的活动就像一个委托或一个方法，传递事件的参数。

In my c# app I have a progressbar. C# app is calling a c++/cli dll which processes a number of files. As each file is processed in the dll I would like to track it's progress in the c# app. For this i need to raise an event in c++/cli and consume it in C#. From MSDN I gather I need in my c++/cli class the following:

  delegate void Del(int);
  event Del^ E;
  void fire(int i) {
      E(i);
   }

MSDN Events

In MSDN the receiver of the event is in the same c++/cli project and it is shown how to raise the event. In my project, the c# app is to receive the event which should be raised in c++/cli after each file is processed. I've googled a lot too but have not been able to figure it out yet. So, my question is, how do I raise this event in c++/cli, and how do I connect my c# program to it? Some code that shows the way to do it would be greatly appreciated. thanks!

Matt, thanks for responding. In C# I am trying

MW.Class1 oM = new MW.Class1();
oM.fire += ProgressBarChanged(int i);

It does not compile saying cannot assign because fire is a method group. I also have in my C# program, the handler

public void ProgressBarChanged(int i )
{

}

This does better though compiler says int is not expected and does not compile

oM.fire += new EventHandler(ProgressBarChanged(int i));

解决方案

As the error message says, fire is a method, not an event. Call += on the event, and leave off the () when you reference the event handler method.

oM.E += this.ProgressBarChanged;

As for firing the event, you're doing that correctly: Just call your event like a delegate or a method, passing the event arguments.

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