订阅带有反射的事件

稍加改动,我就可以执行您的示例了。

首先,关于 Trace 必须有不同的签名才能与 EventHandler

public class Trace
{
    public void WriteTrace(object sender, EventArgs e)
    {
        Console.WriteLine("Trace !");
    }
}

接下来,对 SubscribeEvent :

public void SubscribeEvent(Control control)
{
    if (typeof(Control).IsAssignableFrom(control.GetType()))
    {
        Trace test = this;
        MethodInfo method = typeof(Trace).GetMethod("WriteTrace");

        EventInfo eventInfo = control.GetType().GetEvent("Load");

        // Create the delegate on the test class because that's where the
        // method is. This corresponds with `new EventHandler(test.WriteTrace)`.
        Delegate handler = Delegate.CreateDelegate(eventInfo.EventHandlerType, test, method);
        // Assign the eventhandler. This corresponds with `control.Load += ...`.
        eventInfo.AddEventHandler(control, handler);
    }
}

我希望这能有帮助。

第一个问题是Trace.WriteTrace方法签名与窗体不匹配。加载事件处理程序语法

void WriteTrace(object sender, EventArgs e)
{
    Console.WriteLine("Trace !");
}

另外,对CreateDelegate的调用需要传递跟踪对象,而不是控件对象:

Trace test = this;
MethodInfo method = typeof(Trace).GetMethod("WriteTrace");

// Subscribe to the event
EventInfo eventInfo = control.GetType().GetEvent("Load"); // We suppose control is a form 

Delegate handler = Delegate.CreateDelegate(eventInfo.EventHandlerType, this, method); // ERROR : Error binding to target method
eventInfo.AddEventHandler(control, handler);