C#反思程序化事件处理程序与自定义事件精灵 [英] C# Reflection Programmatic Event Handlers with Custom Event Args
问题描述
这是我的问题/方案
public class TestEventArgs : EventArgs
{
public int ID { get; set; }
public string Name { get; set; }
}
public event EventHandler<TestEventArgs> TestClick
如何使用反射将TestHandler附加到TestClick上? (obj是实例,Activator.CreateInstance)
How can I attach an EventHandler on TestClick by using reflection? (obj is instance, Activator.CreateInstance)
EventInfo eventClick = obj.GetType().GetEvent("TestClick");
Delegate handler = Delegate.CreateDelegate(eventClick.EventHandlerType, obj, ????);
eventClick.AddEventHandler(obj, handler);
我的问题是TestEventArgs在外部DLL中声明,上面的methodinfo需要在其委托中签名?
My problem being that TestEventArgs is declared in an external dll, but ???? methodinfo above requires the signature in its delegate?
推荐答案
我设法通过遵循以下描述的技术来使我的代码工作文章,
http: //www.pelennorfields.com/matt/2009/03/13/createdelegate-error-binding-to-target-method/
I manage to get my code to work by following the technique describe by the following article, http://www.pelennorfields.com/matt/2009/03/13/createdelegate-error-binding-to-target-method/
实质上,如果我执行以下操作,我会收到错误,绑定到目标方法的错误,
In essence, if I do the following, I get the error, "Error binding to target method",
失败:
EventInfo eventClick = obj.GetType().GetEvent("TestClick");
Delegate handler = Delegate.CreateDelegate(
eventClick.EventHandlerType, this, "TestClick");
eventClick.AddEventHandler(obj, handler);
成功:
但是当我更改为:
MethodInfo methodOn_TestClick = this.GetType().GetMethod("TestClick", new Type[] { typeof(object), typeof(EventArgs));
Delegate handler = Delegate.CreateDelegate(
event_DomClick.EventHandlerType, this, methodOn_TestClick, true); // note the change here
eventClick.AddEventHandler(obj, handler);
然后,我使用TestClick方法中的反射,以获取标准EventArgs中需要的属性。
I then used reflection in my TestClick method, to get the properties I needed out of the standard EventArgs.
例如。
public void TestClick(object sender, EventArgs e)
{
PropertyInfo prop_ID = e.GetType().GetProperty("ID");
int id = Convert.toInt32(prop_ID.GetValue(e, null));
}
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