WPF 窗口穿透

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    private const uint WS_EX_LAYERED = 0x80000;
    private const int WS_EX_TRANSPARENT = 0x20;
    private const int GWL_EXSTYLE = (-20);

    [DllImport("user32", EntryPoint = "SetWindowLong")]
    private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong);

    [DllImport("user32", EntryPoint = "GetWindowLong")]
    private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);

    [DllImport("user32.dll", EntryPoint = "FindWindow")]
    private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);

    /// <summary>
    /// 通过标题找到窗口并设置其是否穿透
    /// </summary>
    /// <param name="title">窗口标题</param>
    /// <param name="flag">是否穿透, 默认值true</param>
    public static void SetWindowPenetrate(string title, bool flag = true)
    {
        IntPtr hwnd = FindWindow(null, title);
        uint style = GetWindowLong(hwnd, GWL_EXSTYLE);
        if (flag)
            SetWindowLong(hwnd, GWL_EXSTYLE, style | WS_EX_TRANSPARENT | WS_EX_LAYERED);
        else
            SetWindowLong(hwnd, GWL_EXSTYLE, style & ~(WS_EX_TRANSPARENT | WS_EX_LAYERED));
    }