我可以将 BeginInvoke 与 MulticastDelegate 一起使用吗？

发布于 2024-10-12 09:44:09 字数 452 浏览 1 评论 0原文

我想从我的库类中引发一系列事件，但我担心某些事件订阅者会很粗鲁，需要很长时间来处理某些事件，从而阻塞引发事件的线程。我认为我可以通过使用线程池线程来引发每个事件来保护引发线程：

if (packet != null && DataPacketReceived != null)
{
    var args = new DataPacketEventArgs(packet);
    DataPacketReceived.BeginInvoke(this, args, null, null);
}

当只有一个事件订阅者时，这种方法工作正常，但一旦第二个订阅者到达，DataPacketReceived 就会变成多播委托，我收到一个参数异常，并显示错误消息“委托必须只有一个目标”。有没有一种简单的方法可以在单独的线程上引发事件，或者我是否必须启动一个线程，然后从那里引发事件？

原文

I want to raise a series of events from my library class, but I'm worried that some event subscribers will be rude and take a long time to process some events, thus blocking the thread that is raising the events. I thought I could protect the raising thread by using a thread pool thread to raise each event:

if (packet != null && DataPacketReceived != null)
{
    var args = new DataPacketEventArgs(packet);
    DataPacketReceived.BeginInvoke(this, args, null, null);
}

That works fine when there's only one subscriber to the event, but as soon as a second subscriber arrives, DataPacketReceived becomes a multicast delegate, and I get an argument exception with the error message, "The delegate must have only one target." Is there an easy way to raise the event on a separate thread, or do I have to start a thread and then raise the event from there?

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爱给你人给你 2024-10-19 09:44:09

我在另一个网站< /a>，当然乔恩·斯基特已经回答了。对于我的场景，我选择在单独的线程上为每个订阅者引发事件：

if (packet != null && DataPacketReceived != null)
{
    var args = new DataPacketEventArgs(packet);
    var receivers = DataPacketReceived.GetInvocationList();
    foreach (EventHandler<DataPacketEventArgs> receiver in receivers)
    {
        receiver.BeginInvoke(this, args, null, null);
    }
}

I found a similar question on another site, and of course Jon Skeet had answered it. For my scenario, I chose to raise the event for each subscriber on a separate thread:

if (packet != null && DataPacketReceived != null)
{
    var args = new DataPacketEventArgs(packet);
    var receivers = DataPacketReceived.GetInvocationList();
    foreach (EventHandler<DataPacketEventArgs> receiver in receivers)
    {
        receiver.BeginInvoke(this, args, null, null);
    }
}

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