Question

继my precedent question之后，我想将参数传递给方法“WriteTrace”。但我不知道该怎么做。

这里是实际代码：

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



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);
    }
}

现在我想在跟踪中获得一些信息：

控件的名称

活动名称

public void WriteTrace(object sender, EventArgs e)
{
    Console.WriteLine("Control : " + e.ControlName + "Event : " + e.EventName);
}

我是否创建了一个TraceEventArgs类，它使用这些信息派生自EventArgs？如何在SubscribeEvent方法中传递这些信息？

感谢您的帮助，

弗洛里安

修改

抱歉，现在提到“我以前的问题”：Subscribe to an event with Reflection

Answer 1

尝试这样的事情：

public void WriteTrace(object sender, EventArgs e, string eventName)
{
    Control c = (Control)sender;
    Console.WriteLine("Control: " + f.Name + ", Event: " + eventName);
}

public void SubscribeEvent(Control control, string eventName) {
    EventInfo eInfo = control.GetType().GetEvent(eventName);

    if (eInfo != null) {
        // create a dummy, using a closure to capture the eventName parameter
        // this is to make use of the C# closure mechanism
        EventHandler dummyDelegate = (s, e) => WriteTrace(s, e, eventName);

        // Delegate.Method returns the MethodInfo for the delegated method
        Delegate realDelegate = Delegate.CreateDelegate(eInfo.EventHandlerType, dummyDelegate.Target, dummyDelegate.Method);

        eInfo.AddEventHandler(control, realDelegate);
    }
}

如何通过反射将参数传递给方法

1 个答案: