C＃组件事件？ [英] C# component events?

问题描述

我试图写一个C＃组件，它会公开事件。该组件是由非托管C ++应用程序导入。据一些教程我想出了这个code（对于C＃方）：

I am attempting to write a C# component which will expose events. The component is to be imported by an unmanaged C++ application. According to a few tutorials I have come up with this code (for the C# side):

namespace COMTest
{
[ComVisible(true),
Guid("02271CDF-BDB9-4cfe-B65B-2FA58FF1F64B"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
public interface ITestEvents
{
    void OnTest();
}

[ComVisible(true),
Guid("87BA4D3A-868E-4233-A324-30035154F8A4")]
public interface ITest
{
    void RaiseTest();
} // End of ITest

[ComVisible(true),
Guid("410CD174-8933-4f8c-A799-8EE82AF4A9F2"),
ClassInterface(ClassInterfaceType.None),
ComSourceInterfaces(typeof(ITestEvents))]
public class TestImplimentation : ITest
{
    public TestImplimentation()
    {
    }

    public void RaiseTest()
    {
        if (null != OnTest)
            OnTest();
    }

    public delegate void Test (); //No need to expose this delegate
    public event Test OnTest;
}
}

现在我的C ++ code有一个简单的：

Now my c++ code has a simple:

#import "COMTest.tlb" named_guids raw_interfaces_only

生成一个TLH文件。此TLH文件包含一切，但我的事件（OnTest）。我在做什么错误？

Which generates a tlh file. This tlh file contains everything but my event (OnTest). What am I doing incorrectly?

推荐答案

COM事件接收器pretty的邪恶的门外汉。

COM Event Sinks are pretty evil to the uninitiated.

步骤基本上都是

• 创建一个输出（源）接口
• 在实现一个 的IConnectionPointContainer和 的IConnectionPoint接口，使用 这些通过一个客户端实现 源接口

• create an outgoing (source) interface
• Implement an IConnectionPointContainer and IConnectionPoint Interfaces, use these to pass a client implementation of the source Interface

在好的消息是，在互操作命名空间中有属性来帮你做这个（大部分）自动（<一href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.comsourceinterfacesattribute.aspx"相对=nofollow> ComSourceInterfacesAttribute ）有其使用的这里。

The good news is that in the interop namespace there are attributes to help you do this (mostly) automatically (ComSourceInterfacesAttribute) There is a decent example of its usage here.

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