C# 后台工作线程自行停止

我用 C# 编写了一个程序，该程序启用了多个全局热键，并根据按下的热键激活 chrome、Firefox、记事本、计算器等窗口。注册全局热键后，我有一个无限的while循环，可以使应用程序保持活动状态。运行程序后，热键突然停止工作。这有时会在几个小时后发生。经过长时间测试我的每一段代码，我发现了问题所在。问题是主线程突然停止工作。该程序仍然活着并在内存中。热键似乎在另一个处于活动状态的线程中注册，即使包含 while-loop 的主线程已死，也能保持程序运行。

然后，我使用后台工作线程并在后台工作线程中移动了 while 循环。它再次发生，这意味着后台工作者突然停止，而热键仍在注册。这不是我第一次使用backgroudworker，我从来没有遇到过后台worker自己退出这样的事情。

发生这种情况时，像这样的消息会出现在Visual Studio的输出窗口中：

The thread 0x1b24 has exited with code 0 (0x0)

线程是否有任何时间限制，以便它们在此之后退出？您对这种情况是如何发生的以及我如何解决它有什么建议吗？

对于全局热键，我使用此处列出的代码：

http://stackoverflow.com/a/3654821/3179989

这是我代码的其余部分：

    public static void HotKeyPressed(object sender, HotKeyEventArgs e)
    {
        string PressedHotkey = e.Modifiers.ToString() + " " + e.Key.ToString();
        switch (PressedHotkey)
        {
            case "Alt D1":
                mActivateWindow(mEnumApplications.Chrome);
                break;
            case "Alt D3":
                mActivateWindow(mEnumApplications.CintaNotes);
                break;
            default:
                break;
        }
    }
    private void button1_Click(object sender, EventArgs e)
    {
        bgWkrHotkey.WorkerSupportsCancellation = true;
        bgWkrHotkey.WorkerReportsProgress = true;
        bgWkrHotkey.RunWorkerAsync();
    }
    private void bgWkrHotkey_DoWork(object sender, DoWorkEventArgs e)
    {
        mHotKeyManager.RegisterHotKey(Keys.Oemtilde, KeyModifiers.Alt);
        mHotKeyManager.RegisterHotKey(Keys.D1, KeyModifiers.Alt);
        mHotKeyManager.RegisterHotKey(Keys.D3, KeyModifiers.Alt);
        mHotKeyManager.HotKeyPressed += new EventHandler<HotKeyEventArgs>(HotKeyPressed);
        while (true)
        {
            Thread.Sleep(50);
        }
    }
    //@@@@@@@@@@@@@@@@@@@@ DLL IMPORTS @@@@@@@@@@@@@@@@@@@@
    #region DLL IMPORTS
    [DllImport("User32.dll")]
    private static extern IntPtr SetForegroundWindow(IntPtr hWnd);
    [DllImport("user32.dll")]
    static extern IntPtr GetForegroundWindow();
    delegate bool EnumWindowsProc(IntPtr hWnd, int lParam);
    [DllImport("USER32.DLL")]
    static extern bool EnumWindows(EnumWindowsProc enumFunc, int lParam);
    [DllImport("USER32.DLL")]
    static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
    [DllImport("USER32.DLL")]
    static extern int GetWindowTextLength(IntPtr hWnd);
    [DllImport("USER32.DLL")]
    static extern IntPtr GetShellWindow();
    #endregion DLL IMPORTS
    public static IDictionary<IntPtr, string> mGetOpenWindows()
    {
        IntPtr ipShellWindow = GetShellWindow();
        Dictionary<IntPtr, string> ipWindows = new Dictionary<IntPtr, string>();
        EnumWindows(delegate(IntPtr hWnd, int lParam)
        {
            if (hWnd == ipShellWindow) return true;
            //if (!IsWindowVisible(hWnd)) return true;
            int lLength = GetWindowTextLength(hWnd);
            if (lLength == 0) return true;
            StringBuilder lBuilder = new StringBuilder(lLength);
            GetWindowText(hWnd, lBuilder, lLength + 1);
            ipWindows[hWnd] = lBuilder.ToString();
            return true;
        }, 0);
        return ipWindows;
    }
    public static string mGetActiveWindowTitle()
    {
        const int nChars = 256;
        StringBuilder Buff = new StringBuilder(nChars);
        IntPtr handle = GetForegroundWindow();
        if (GetWindowText(handle, Buff, nChars) > 0)
        {
            return Buff.ToString();
        }
        return "";
    }

    public static bool mActivateWindow(IntPtr ipHandle, string strWindowTitle)
    {
        StringBuilder Buff = new StringBuilder(256);
        SetForegroundWindow(ipHandle);
        Stopwatch swTimeout = new Stopwatch();
        swTimeout.Start();
        while (swTimeout.Elapsed < TimeSpan.FromSeconds(2))
        {
            ipHandle = GetForegroundWindow();
            if ((GetWindowText(ipHandle, Buff, 256) > 0) && (Buff.ToString().ToLower().Contains(strWindowTitle.ToLower())))
                return true;
            else
            {
                SetForegroundWindow(ipHandle);
                Thread.Sleep(50);
            }
        }
        swTimeout.Stop();
        return false;
    }
    public static bool mActivateWindow(mEnumApplications enumApp)
    {
        string strWindowTitle = "";
        switch (enumApp)
        {
            case mEnumApplications.Chrome:
                strWindowTitle = "Google Chrome";
                break;
            case mEnumApplications.CintaNotes:
                strWindowTitle = "CintaNotes";
                break;
            default:
                break;
        }
        IntPtr ipHandle = IntPtr.Zero;
        string strExactTitle = "";
        StringBuilder Buff = new StringBuilder(256);
        foreach (KeyValuePair<IntPtr, string> ipWindow in mGetOpenWindows())
        {
            ipHandle = ipWindow.Key;
            strExactTitle = ipWindow.Value;
            if (strExactTitle.ToLower().Contains(strWindowTitle.ToLower()))
                if (mActivateWindow(ipHandle, strWindowTitle))
                    return true;
        }
        return false;
    }
    public enum mEnumApplications
    {
        Null,
        Chrome,
        CintaNotes,
    };

我感谢任何帮助。谢谢

int lLength = GetWindowTextLength(hWnd);
if (lLength == 0) return true;

StringBuilder lBuilder = new StringBuilder(lLength+1);  // <-- changed to lLength+1
GetWindowText(hWnd, lBuilder, lLength + 1);

delegate bool EnumWindowsProc(IntPtr hWnd, int lParam);

delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

[DllImport("USER32.DLL")]
static extern bool EnumWindows(EnumWindowsProc enumFunc, IntPtr lParam);