C# 组件事件?

问题描述

我正在尝试编写一个公开事件的 C# 组件.该组件将由非托管 C++ 应用程序导入.根据一些教程，我想出了这段代码(用于 C# 端):

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++ 代码有一个简单的:

Now my c++ code has a simple:

#import "COMTest.tlb" named_guids raw_interfaces_only

这会生成一个 tlh 文件.此 tlh 文件包含除我的事件 (OnTest) 之外的所有内容.我做错了什么?

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

推荐答案

COM 事件接收器对于外行来说是相当邪恶的.

COM Event Sinks are pretty evil to the uninitiated.

步骤基本是

• 创建一个传出(源)接口
• 实施一个IConnectionPointContainer 和IConnectionPoint 接口，使用这些传递一个客户端实现源接口的

好消息是，在互操作命名空间中有一些属性可以帮助您(大部分)自动执行此操作(ComSourceInterfacesAttribute) 有一个很好的使用例子这里.

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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