如何手动调用事件？

Question

我在C#中有以下行:

_timer.ElapsedTick += _somefunction1;
_timer.ElapsedTick += _somefunction2;
_timer.ElapsedTick += _somefunction3;

如何在不指定_somefunction的情况下调用订阅_timer.ElapsedTick的所有方法？沿着这条伪线的某个地方

invoke(_timer.ElapsedTick);

非常感激您的帮忙.

更新

@ M.Babcock的例子正在发挥作用.FireEvent方法具有魔力.谢谢.

class InvokeFromMe
{
    public event EventHandler RaiseMe;
}
class MainClass
{
    public MainClass()
    {
        InvokeFromMe fromMe = new InvokeFromMe();
        fromMe.RaiseMe += fromMe_RaiseMe;
        fromMe.RaiseMe += fromMe_RaiseMe1;
        FireEvent(fromMe, "RaiseMe", null, EventArgs.Empty);
        //works

        System.Timers.Timer _timer = new System.Timers.Timer();
        _timer.Elapsed += _timer_Elapsed;
        FireEvent(_timer, "onIntervalElapsed", null, null);
        //throws exception
    }
    private void _timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        Console.WriteLine("_timer_Elapsed raised");
    }
    private void fromMe_RaiseMe(object sender, EventArgs e)
    {
        Console.WriteLine("Event Handler 0 Raised");
    }
    private void fromMe_RaiseMe1(object sender, EventArgs e)
    {
        Console.WriteLine("Event Handler 1 Raised");
    }
    public void FireEvent(object onMe, string invokeMe, params object[] eventParams)
    {
        MulticastDelegate eventDelagate =
              (MulticastDelegate)onMe.GetType().GetField(invokeMe,
               System.Reflection.BindingFlags.Instance |
               System.Reflection.BindingFlags.NonPublic).GetValue(onMe);

        Delegate[] delegates = eventDelagate.GetInvocationList();

        foreach (Delegate dlg in delegates)
        {
            dlg.Method.Invoke(dlg.Target, eventParams);
        }
    }
}
class Program
{
    static void Main(string[] args)
    {
        MainClass m = new MainClass();
    }
}

Answer 1

您不能调用由其他类型拥有的事件.事件只能从声明它的类内部调用.

Answer 2

可以使用传统的C#完成吗？不(如前所述).但使用反射是可能的.以下是基于此MSDN论坛帖子的答案的一些经过测试的代码:

class InvokeFromMe
{
    public event EventHandler RaiseMe;
}

class Program
{
    static void Main(string[] args)
    {
        var fromMe = new InvokeFromMe();

        fromMe.RaiseMe += fromMe_RaiseMe;
        fromMe.RaiseMe += fromMe_RaiseMe1;
        fromMe.RaiseMe += fromMe_RaiseMe2;

        FireEvent(fromMe, "RaiseMe", null, EventArgs.Empty);
    }

    static void fromMe_RaiseMe(object sender, EventArgs e)
    {
        Console.WriteLine("Event Handler 0 Raised");
    }
    static void fromMe_RaiseMe1(object sender, EventArgs e)
    {
        Console.WriteLine("Event Handler 1 Raised");
    }
    static void fromMe_RaiseMe2(object sender, EventArgs e)
    {
        Console.WriteLine("Event Handler 2 Raised");
    }

    public static void FireEvent(object onMe, string invokeMe, params object[] eventParams)
    {
        MulticastDelegate eventDelagate =
              (MulticastDelegate)onMe.GetType().GetField(invokeMe,
               System.Reflection.BindingFlags.Instance |
               System.Reflection.BindingFlags.NonPublic).GetValue(onMe);

        Delegate[] delegates = eventDelagate.GetInvocationList();

        foreach (Delegate dlg in delegates)
        {
            dlg.Method.Invoke(dlg.Target, eventParams);
        }
    } 

}

UPDATE

我不熟悉这门System.Timer.Timer课程,所以我不确定与我提供的例子有什么不同.您也许可以尝试以下方法:

public static void FirePublicEvent(object onMe, string invokeMe, params object[] eventParams)
{
    MulticastDelegate eventDelagate =
          (MulticastDelegate)onMe.GetType().GetField(invokeMe,
           System.Reflection.BindingFlags.Instance |
           System.Reflection.BindingFlags.Public).GetValue(onMe);

    Delegate[] delegates = eventDelagate.GetInvocationList();

    foreach (Delegate dlg in delegates)
    {
       dlg.Method.Invoke(dlg.Target, eventParams);
    }
} 

Answer 3

好吧，我最终在这里搜索如何简单地启动事件，它没有任何自定义参数或任何东西。我知道 OP 问题是不同的！但我想分享，我希望它可以帮助某人。

非简化版：

 var Handler = EventNameHere;
        if (Handler != null)
        {
            Handler(this, EventArgs.Empty);
        }

简化版：

 EventNameHere?.Invoke(this, EventArgs.Empty);