最大化时，SetWindowPlacement不会还原到同一监视器

Question

我有一个Windows窗体应用程序，它使用以下代码保持工具窗口的位置：

ToolWindow = new ToolViewer(TransformedResult);

ToolWindow.FormClosed += (_1, _2) =>
{
    this.ToolWindowPlacement = WindowPlacement.GetPlacement(ToolWindow.Handle);

    this.ToolWindow = null;
};
ToolWindow.Show();
WindowPlacement.SetPlacement(ToolWindow.Handle, ToolWindowPlacement);

除非工具窗口最大化，否则它可以正常工作。如果它最大化，窗口会一直显示在我的主显示器上，而不是在关闭时显示最大化的窗口。

WindowPlacement.cs：

// from http://blogs.msdn.com/b/davidrickard/archive/2010/03/09/saving-window-size-and-location-in-wpf-and-winforms.aspx
static class WindowPlacement
{
    [DllImport("user32.dll")]
    private static extern bool SetWindowPlacement(IntPtr hWnd, [In] ref WINDOWPLACEMENT lpwndpl);

    [DllImport("user32.dll")]
    private static extern bool GetWindowPlacement(IntPtr hWnd, out WINDOWPLACEMENT lpwndpl);

    private const int SW_SHOWNORMAL = 1;
    private const int SW_SHOWMINIMIZED = 2;

    public static void SetPlacement(IntPtr windowHandle, WINDOWPLACEMENT placement)
    {
        if (placement.length == 0)
            return;

        placement.length = Marshal.SizeOf(typeof(WINDOWPLACEMENT));
        placement.flags = 0;
        placement.showCmd = (placement.showCmd == SW_SHOWMINIMIZED ? SW_SHOWNORMAL : placement.showCmd);
        SetWindowPlacement(windowHandle, ref placement);
    }

    public static WINDOWPLACEMENT GetPlacement(IntPtr windowHandle)
    {
        WINDOWPLACEMENT placement = new WINDOWPLACEMENT();
        GetWindowPlacement(windowHandle, out placement);

        return placement;
    }
}

Answer 1

出于我所知的原因，我必须删除为表单设置的WindowState的默认Maximized，以便SetWindowPlacement将最大化的窗口恢复到正确的监视器。