如何在 C# 中处理 com 事件?
我在 c# 中创建了一个类库,并使用无注册表 com 技术作为 com 组件公开。
[ComVisible(true)]
[Guid("SOME GUID")]
[InterfaceType(InterfaceType.InterfaceIsIDispatch)]
public interface ICameraEvents //Event Source Interface
{
void OnImageCaptured(object sender, EventArgs e);
}
[Guid("SOME GUID")]
[ComVisible(true)]
public interface IService
{
void RaiseEvent();
}
[Guid("SOME GUID")]
[ComVisible(true)]
[ComSourceInterface(typeof(ICameraEvents))]
[ClassInterface(ClassInterfaceType.None)]
public class Service : IService
{
event EventHandler OnImageCaptured;
public void RaiseEvent()
{
if(OnImageCaptured != null)
OnImageCaptured(null,null);
}
}
这是我的客户 Windows 申请表。
public class MyForm : Form
{
void Form_Load()
{
Type type = Type.GetTypeFromProgID("someid")//Create com object
IService instance = (IService)Activator.CreateInstance(type);
instance.RaiseEvent();
}
void OnImageCaptured(object sender, EventArgs e)
{
MessageBox.Show("Event Fired");
}
}
//Re declare the interface in client application
[Guid("SOME GUID")]
[ComVisible(true)]
public interface IService
{
void RaiseEvent();
}
当我调用 service.RaiseEvent 时,什么也没有发生。任何帮助,将不胜感激。