具有自定义事件参数的C#反射编程事件处理程序

Question

这是我的问题/场景

public class TestEventArgs : EventArgs
{
   public int ID { get; set; }
   public string Name { get; set; }
}

public event EventHandler<TestEventArgs> TestClick

如何使用反射在TestClick上附加EventHandler？(obj是实例,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是在外部dll中声明的,但是???? 上面的methodinfo需要在其委托中签名？

Answer 1

我设法通过以下文章描述的技术来获取我的代码, http://www.pelennorfields.com/matt/2009/03/13/createdelegate-error-binding-to-target-method/

本质上,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",

失败:

EventInfo eventClick = obj.GetType().GetEvent("TestClick");
Delegate handler = Delegate.CreateDelegate(
    eventClick.EventHandlerType, this, "TestClick");
eventClick.AddEventHandler(obj, handler);

成功:

但当我把它改为:

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);

然后我在TestClick方法中使用了反射,从标准的EventArgs中获取我需要的属性.

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));
}