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我试图获取我点击的每个窗口的名称。我有工作代码，但它使用系统计时器而不是表单上的计时器。我将发布代码，以便更容易看到我做错了什么。它也不让我参考我的文本框，我想我需要将它带入函数中。

继承人的DLL导入和变量

    private static string LastActiveWindow = "";
    private static string ActiveWindowName = "";
    [DllImport("user32.dll")]
    private static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern int GetWindowText(IntPtr hWind, StringBuilder lpString, int nMaxCount);

然后我让我的计时器每秒运行 10 次，这将运行活动窗口功能：

    private void TimerActiveWindow_Tick(object sender, EventArgs e)
    {
        ActiveWindow();
    }

    private static void ActiveWindow(object Obj, EventArgs e)
    {
        IntPtr hwnd = GetForegroundWindow();
        const int Capacity = 512;
        var text = new StringBuilder(Capacity);

        try
        {
            if (GetWindowText(hwnd, text, Capacity) > 0)
            {
                if (ActiveWindowName != text.ToString())
                {
                    if (!LastActiveWindow.Equals(text.ToString()))
                    {
                    //    TxtBody.text += "<br><font color = purple> Current Window - [" + text.ToString() + "]</font><br>";
                        LastActiveWindow = text.ToString();
                        MessageBox.Show(text.ToString());
                    }
                }
            }

        }
        catch { }
    }

唯一的区别是我的程序上使用系统计时器的计时器看起来像这样

        System.Timers.Timer TimerActiveWindow = new System.Timers.Timer();
        TimerActiveWindow.Elapsed += new ElapsedEventHandler(Program.ActiveWindow);
        TimerActiveWindow.AutoReset = true;
        TimerActiveWindow.Interval = 100;
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