DispatcherObject 继承和用法...我没有得到什么？

发布于 2024-11-26 17:57:05 字数 838 浏览 1 评论 0原文

所以这是我的代码：

class Program
{
  static DispatchClass dc;

  [STAThread]
  static void Main(string[] args)
  {
    dc = new DispatchClass();

    Thread th = new Thread(AccessDC);
    th.Start();

    Console.ReadKey();
  }

  private delegate void AccessDCDelegate(object state);
  static private void AccessDC(object state)
  {
    if(dc.Dispatcher.CheckAccess())
      dc.Print("hello");
    else
      dc.Dispatcher.Invoke(new AccessDCDelegate(AccessDC));
  }
}

public class DispatchClass : DispatcherObject
{
  public void Print(string str)
  {  
    Console.WriteLine(str);
  }
}

现在...我期望的输出是创建的线程检查调度程序访问，查看它位于不同的线程上，然后在原始线程上调用 AccessDC(...)然后检查并查看它是否位于正确的线程上并调用 dc.Print(...)。

实际发生的情况是，它到达 CheckAccess() 并正确地发现它不在正确的线程上，然后调用 Invoke(...) 并在那里停止。

任何有关调度员如何工作的见解将不胜感激。

谢谢。

原文

So here is my code:

class Program
{
  static DispatchClass dc;

  [STAThread]
  static void Main(string[] args)
  {
    dc = new DispatchClass();

    Thread th = new Thread(AccessDC);
    th.Start();

    Console.ReadKey();
  }

  private delegate void AccessDCDelegate(object state);
  static private void AccessDC(object state)
  {
    if(dc.Dispatcher.CheckAccess())
      dc.Print("hello");
    else
      dc.Dispatcher.Invoke(new AccessDCDelegate(AccessDC));
  }
}

public class DispatchClass : DispatcherObject
{
  public void Print(string str)
  {  
    Console.WriteLine(str);
  }
}

Now...the output I would expect from this is for the created thread to check the dispatcher access, see that it is on a different thread and then invoke AccessDC(...) on the original thread which then checks and sees that it is on the correct thread and calls dc.Print(...).

What actually happens is it gets to CheckAccess() and correctly sees that it isn't on the correct thread, then calls Invoke(...) and stops there.

Any insight into how Dispatchers work would be greatly appreciated.

Thanks.

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九命猫 2024-12-03 17:57:05

调度程序需要消息泵，控制台应用程序默认没有消息泵。尝试将其作为 GUI 应用程序运行 - 这将有一个消息泵。

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倒带 2024-12-03 17:57:05

CheckAccess 验证了您的 CurrentThread DispatchClass 是当前线程，因此它返回给您 False。这是很正常的。
在这段代码中，

dc.Dispatcher.Invoke(new AccessDCDelegate(AccessDC));

您遇到了参数问题，仅此而已。

这段代码有效：

 public partial class MainWindow : Window
{
    static DispatchClass dc;

    public MainWindow()
    {
        InitializeComponent();


        dc = new DispatchClass();

        Thread th = new Thread(AccessDC);
        th.Start();

    }
    private delegate void AccessDCDelegate(object state);
    static private void AccessDC(object state)
    {
        if (dc.Dispatcher.CheckAccess())
            dc.Print("hello");
        else
            dc.Dispatcher.BeginInvoke(new Action(()=> AccessDC(null)));
    }

}

public class DispatchClass : DispatcherObject
{
    public void Print(string str)
    {
        MessageBox.Show(str);
    }
}

CheckAccess verified that your CurrentThread DispatchClass is the current thread so it returned to you False. which is quite normal.
In this snippet of code

dc.Dispatcher.Invoke(new AccessDCDelegate(AccessDC));

You have a problem with arguments that's all.

this snippet of code works :

 public partial class MainWindow : Window
{
    static DispatchClass dc;

    public MainWindow()
    {
        InitializeComponent();


        dc = new DispatchClass();

        Thread th = new Thread(AccessDC);
        th.Start();

    }
    private delegate void AccessDCDelegate(object state);
    static private void AccessDC(object state)
    {
        if (dc.Dispatcher.CheckAccess())
            dc.Print("hello");
        else
            dc.Dispatcher.BeginInvoke(new Action(()=> AccessDC(null)));
    }

}

public class DispatchClass : DispatcherObject
{
    public void Print(string str)
    {
        MessageBox.Show(str);
    }
}

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