我正在为一个使用Windows窗体的应用程序做UI。在咨询了this question和这个窗体后，我做了一个可调整大小的无边框窗体。
我有一台多屏幕计算机。当我在主屏幕上最大化时，窗体正常地最大化。如果我将窗体完全移动到第二个屏幕，然后使用最大化，窗体消失。经过调查，我发现，即使第二个屏幕的属性'this.MaximizedBounds'正确地确定，即{X=-1440，Y = 0，Width =1440，Height=900}，当我使用语句时，

this.WindowState = FormWindowState.Maximized;

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窗体在{X=-2880，Y = 0，Width =1440，Height=900}处绘制，好像由于某种原因绘制方向被反转了？鉴于此，我知道我可以通过编程确定绘制窗体，但我想知道我是否缺少设置一些附加属性以确保绘制方向正确？
以编程方式最大化的窗体的问题是窗体的状态仍然是FormWindowState.Normal，我不能将其更改为FormWindowState.Maximized而不会导致在错误的位置重绘from
使表单无边界的代码

protected override void WndProc(ref Message m)
    {
        const int RESIZE_HANDLE_SIZE = 10;

        switch (m.Msg)
        {
            case 0x0084/*NCHITTEST*/ :
                base.WndProc(ref m);

                if ((int)m.Result == 0x01/*HTCLIENT*/)
                {
                    Point screenPoint = new Point(m.LParam.ToInt32());
                    Point clientPoint = this.PointToClient(screenPoint);
                    if (clientPoint.Y <= RESIZE_HANDLE_SIZE)
                    {
                        if (clientPoint.X <= RESIZE_HANDLE_SIZE)
                            m.Result = (IntPtr)13/*HTTOPLEFT*/ ;
                        else if (clientPoint.X < (Size.Width - RESIZE_HANDLE_SIZE))
                            m.Result = (IntPtr)12/*HTTOP*/ ;
                        else
                            m.Result = (IntPtr)14/*HTTOPRIGHT*/ ;
                    }
                    else if (clientPoint.Y <= (Size.Height - RESIZE_HANDLE_SIZE))
                    {
                        if (clientPoint.X <= RESIZE_HANDLE_SIZE)
                            m.Result = (IntPtr)10/*HTLEFT*/ ;
                        else if (clientPoint.X < (Size.Width - RESIZE_HANDLE_SIZE))
                            m.Result = (IntPtr)2/*HTCAPTION*/ ;
                        else
                            m.Result = (IntPtr)11/*HTRIGHT*/ ;
                    }
                    else
                    {
                        if (clientPoint.X <= RESIZE_HANDLE_SIZE)
                            m.Result = (IntPtr)16/*HTBOTTOMLEFT*/ ;
                        else if (clientPoint.X < (Size.Width - RESIZE_HANDLE_SIZE))
                            m.Result = (IntPtr)15/*HTBOTTOM*/ ;
                        else
                            m.Result = (IntPtr)17/*HTBOTTOMRIGHT*/ ;
                    }
                }
                return;
        }
        base.WndProc(ref m);
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams cp = base.CreateParams;
            cp.Style |= 0x20000; // <--- use 0x20000
            cp.ClassStyle |= 0x08; 
            return cp;
        }
    }

型
代码退出，最大化/恢复，最小化

private void button1_Click(object sender, EventArgs e)
    {
        Application.Exit();
    }
    private void button2_Click(object sender, EventArgs e)
    {
        if(this.WindowState==FormWindowState.Normal)
        {
            this.button2.Image = ((System.Drawing.Image)(Properties.Resources.Restore_Down));
            this.MaximizedBounds = Screen.FromHandle(this.Handle).WorkingArea;
            this.WindowState = FormWindowState.Maximized;

        }
        else if(this.WindowState == FormWindowState.Maximized)
        {
            this.WindowState = FormWindowState.Normal;
            this.button2.Image = ((System.Drawing.Image)(Properties.Resources.Maximize));
        }
    }
    private void button3_Click(object sender, EventArgs e)
    {
        this.WindowState = FormWindowState.Minimized;
    }

型