C# - System.Windows.Forms.Clipboard.GetDataObject() 没有响应

在主线程中调用 System.Windows.Forms.Clipboard.GetDataObject() 之后，为什么在从不同线程调用 System.Windows.Forms.Clipboard.Clear() 时和主线程停止之前，System.Windows.Forms.Clipboard.GetDataObject() 不返回？

我编写了一个示例程序来解释我的问题:

public class ClipboardDemo
{
    [STAThread]
    public static void Main(string[] args)
    {
        Thread.CurrentThread.Name = "MAIN_THREAD";

        Thread clipboardViewerThread = new Thread(RunClipboardViewer);
        clipboardViewerThread.Name = "CLIPBOARD_VIEWER_THREAD";
        clipboardViewerThread.SetApartmentState(ApartmentState.STA);

        Thread clipboardClearerThread = new Thread(RunClipboardClearer);
        clipboardClearerThread.Name = "CLIPBOARD_CLEARER_THREAD";
        clipboardClearerThread.SetApartmentState(ApartmentState.STA);

        Console.WriteLine("Starting " + clipboardViewerThread.Name + ", expecting initial WM_DRAWCLIPBOARD message...");
        clipboardViewerThread.Start();
        Thread.Sleep(1000);

        Console.WriteLine("Clearing clipboard from " + clipboardClearerThread.Name + ", expecting WM_DRAWCLIPBOARD message...");
        clipboardClearerThread.Start();
        clipboardClearerThread.Join();

        Console.WriteLine("Clearing clipboard from " + Thread.CurrentThread.Name + ", expecting WM_DRAWCLIPBOARD message...");
        Clipboard.Clear();
        Thread.Sleep(1000);

        Application.Exit();
        Console.WriteLine("\t" + Thread.CurrentThread.Name + " stopped!");
    }

    private static void RunClipboardViewer()
    {
        ClipboardViewer viewer = new ClipboardViewer();
        viewer.ViewClipboard();
        viewer.Dispose();
    }

    private static void RunClipboardClearer()
    {
        Clipboard.Clear();
    }
}

internal class ClipboardViewer : NativeWindow, IDisposable
{
    private const int WM_CREATE = 0x0001;
    private const int WM_DRAWCLIPBOARD = 0x0308;
    private const int WM_CHANGECBCHAIN = 0x030D;

    private IntPtr nextViewer;

    public void ViewClipboard()
    {
        base.CreateHandle(new CreateParams());
        Application.Run();
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        switch (m.Msg)
        {
            case WM_CREATE:
                nextViewer = User32Interop.SetClipboardViewer(base.Handle);
                break;
            case WM_DRAWCLIPBOARD:
                if (nextViewer != IntPtr.Zero)
                {
                    User32Interop.SendMessage(nextViewer, WM_DRAWCLIPBOARD, m.WParam, m.LParam);
                }
                Console.WriteLine("\tClipboard changed in " + Thread.CurrentThread.Name + ". Trying to receive data object...");
                Clipboard.GetDataObject();
                Console.WriteLine("\tData object received!");
                break;
            case WM_CHANGECBCHAIN:
                if (m.WParam == nextViewer)
                {
                    nextViewer = m.LParam;
                }
                else if (nextViewer != IntPtr.Zero)
                {
                    User32Interop.SendMessage(nextViewer, WM_CHANGECBCHAIN, m.WParam, m.LParam);
                }
                break;
        }
    }

    private void Dispose(bool disposing)
    {
        if (disposing)
        {
            User32Interop.ChangeClipboardChain(base.Handle, nextViewer);
        }
        base.DestroyHandle();
    }

    ~ClipboardViewer()
    {
        Dispose(false);
    }
}

internal static class User32Interop
{
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
}

格式化的输出是:

Starting CLIPBOARD_VIEWER_THREAD, expecting initial WM_DRAWCLIPBOARD message...
  Clipboard changed in CLIPBOARD_VIEWER_THREAD. Trying to receive data object...
  Data object received!

Clearing clipboard from CLIPBOARD_CLEARER_THREAD, expecting WM_DRAWCLIPBOARD message...
  Clipboard changed in CLIPBOARD_VIEWER_THREAD. Trying to receive data object...
  Data object received!

Clearing clipboard from MAIN_THREAD, expecting WM_DRAWCLIPBOARD message...
  Clipboard changed in CLIPBOARD_VIEWER_THREAD. Trying to receive data object...
  MAIN_THREAD stopped!
  Data object received!

正如您在最后三行中看到的，ojit_code 在主线程停止时返回，但不会更早。这个问题有解决方案吗？

最佳答案

您做得对，为工作线程选择 STA 并让它们泵送消息循环。除了一个:你的主线程。它只是偶然抽水。 Thread.Join() 调用使 CLR 泵。但是 Thread.Sleep() 不会抽水。您可以随意替换它并解决您的问题:

    var dummy = new AutoResetEvent(false);
    dummy.WaitOne(1000);

但这是一个黑客。我意识到这只是一个测试应用程序，想想你真正的应用程序会是什么样子。

关于C# - System.Windows.Forms.Clipboard.GetDataObject() 没有响应，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7364568/