从 C# 中的图片框移动 windows 表单

Question

我有一个没有边框的 windows 表单。所以我添加了一个图片框，我希望在单击该图片框时移动整个表单。

    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;

    [DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd,
    int Msg, int wParam, int lParam);
    [DllImportAttribute("user32.dll")]
    public static extern bool ReleaseCapture();

    private void header_image_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
        } 
    }

这是我正在使用的代码atm.But我的问题是，如果我非常快速地移动光标，它不会粘在图片框上。

我试图找到解决方案，但没有任何结果。我使用了这两个链接中的一些信息：

link 1

link 2

有什么想法吗？

编辑：这是我表单的全部代码

    public Form1()
    {
        InitializeComponent();
    }

    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;

    [DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd,
    int Msg, int wParam, int lParam);
    [DllImportAttribute("user32.dll")]
    public static extern bool ReleaseCapture();

    private void header_image_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
        } 
    }

Answer 1

参考这段代码：

 private bool draging = false;
        private Point pointClicked;
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (draging)
            {
                Point pointMoveTo;
                pointMoveTo = this.PointToScreen(new Point(e.X, e.Y));
                pointMoveTo.Offset(-pointClicked.X, -pointClicked.Y);
                this.Location = pointMoveTo;
            }
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                draging = true;
                pointClicked = new Point(e.X, e.Y);
            }
            else
            {
                draging = false;
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            draging = false;
        }

Answer 2

使用 MouseMove() 事件代替 MouseDown():

    private void header_image_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
        }
    }

从 C# 中的图片框移动 windows 表单

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