C# 如何在所有的it上拖动无边框窗体'；s区？如何调整无边框窗体的大小？

我已经为您创建了一个相当简单的类，它将完成您需要的所有操作。可以创建快捷键，调整窗体的大小（即使窗体没有边框），也可以通过单击并拖动窗体内的任意点来移动窗体。希望这有帮助，我尽了最大努力在注释中解释代码。如果你需要更多的澄清，请告诉我

CustomForm.cs：

protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x84:
                    base.WndProc(ref m);
                    if ((int)m.Result == 0x1)
                        m.Result = (IntPtr)0x2;
                    return;
            }

            base.WndProc(ref m);
        }

---

这些问题在这里已经被多次回答了。总是在问之前谷歌这里！！！到目前为止，他们没有一个像我想要的那样工作。我希望它是无边界的，可以从任何窗体区域移动。Hans link可以拖动窗体，但只能从顶部的小部件栏拖动。在我的问题代码中，我可以从表单的任何区域拖动表单，但不能调整大小。所有的答案不是这个就是这个。无法使其从任何窗体区域移动，也无法调整大小。您只需处理窗体的MouseDown、MouseMove和MouseUp事件即可。在MouseDown事件中，存储当前鼠标指针位置，在MouseMove事件中，将其与当前进行比较并设置窗体位置，在MouseUp事件中，重新设置起始点值。回答正确。只需记住处置

mybrush

OnFormClosed

。如果表单在应用程序的生命周期中多次打开/关闭，这将是一个问题。您也可以在

OnPaint

事件中使用（Brush mybrush=new SolidBrush（））{}（如果引用的颜色由于某种原因发生变化，这也会很方便）

protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case 0x84:
                    base.WndProc(ref m);
                    if ((int)m.Result == 0x1)
                        m.Result = (IntPtr)0x2;
                    return;
            }

            base.WndProc(ref m);
        }

public class CustomForm : Form
{
    /// <summary>
    /// How close your cursor must be to any of the sides/corners of the form to be able to resize
    /// </summary>
    public int GrabSize = 8;

    /// <summary>
    /// The shortcut keys for this form
    /// </summary>
    public Dictionary<Keys, Action> ShortcutKeys = new Dictionary<Keys, Action>();

    private bool Drag = false;
    private Point DragOrigin;
    private const int HT_LEFT = 10;
    private const int HT_RIGHT = 11;
    private const int HT_TOP = 12;
    private const int HT_BOTTOM = 15;
    private const int HT_TOPLEFT = 13;
    private const int HT_TOPRIGHT = 14;
    private const int HT_BOTTOMLEFT = 16;
    private const int HT_BOTTOMRIGHT = 17;

    protected override void OnMouseDown(MouseEventArgs e)
    {
        base.OnMouseDown(e);

        // If hold left click on the form, then start the dragging operation
        if (e.Button == MouseButtons.Left)
        {
            // Only start dragging operation if cursor position is NOT within the resize regions
            if (e.X > GrabSize && e.X < Width - GrabSize && e.Y > GrabSize && e.Y < Height - GrabSize)
            {
                DragOrigin = e.Location;
                Drag = true;
            }
        }
    }

    protected override void OnMouseUp(MouseEventArgs e)
    {
        base.OnMouseUp(e);

        // If let go of left click while dragging the form, then stop the dragging operation
        if (e.Button == MouseButtons.Left && Drag)
            Drag = false;
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        base.OnMouseMove(e);

        // Move the form location based on where the cursor has moved relative to where the cursor position was when we first started the dragging operation
        if (Drag)
            Location = new Point(Location.X + (e.Location.X - DragOrigin.X), Location.Y + (e.Location.Y - DragOrigin.Y));
    }

    /// <summary>
    /// Invokes any shortcut keys that have been added to this form
    /// </summary>
    protected override bool ProcessCmdKey(ref Message msg, Keys key)
    {
        Action action;
        if(ShortcutKeys.TryGetValue(key, out action))
        {
            action.Invoke();
            return true;
        }
        return base.ProcessCmdKey(ref msg, key);
    }

    /// <summary>
    /// Handles resizing of a borderless control/winform
    /// </summary>
    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        if(FormBorderStyle == FormBorderStyle.None && m.Msg == 0x84)
        {
            Point CursorLocation = PointToClient(new Point(m.LParam.ToInt32()));
            if (CursorLocation.X <= GrabSize)
            {
                if (CursorLocation.Y <= GrabSize) // TOP LEFT
                    m.Result = new IntPtr(HT_TOPLEFT);
                else if (CursorLocation.Y >= ClientSize.Height - GrabSize) // BOTTOM LEFT
                    m.Result = new IntPtr(HT_BOTTOMLEFT);
                else
                    m.Result = new IntPtr(HT_LEFT); // RESIZE LEFT
            }
            else if (CursorLocation.X >= ClientSize.Width - GrabSize)
            {
                if (CursorLocation.Y <= GrabSize)
                    m.Result = new IntPtr(HT_TOPRIGHT); // RESIZE TOP RIGHT
                else if (CursorLocation.Y >= ClientSize.Height - GrabSize)
                    m.Result = new IntPtr(HT_BOTTOMRIGHT); // RESIZE BOTTOM RIGHT
                else
                    m.Result = new IntPtr(HT_RIGHT); // RESIZE RIGHT
            }
            else if (CursorLocation.Y <= GrabSize)
                m.Result = new IntPtr(HT_TOP); // RESIZE TOP
            else if (CursorLocation.Y >= ClientSize.Height - GrabSize)
                m.Result = new IntPtr(HT_BOTTOM); // RESIZE BOTTOM
        }
    }
}

public partial class Form1 : CustomForm
{
    SolidBrush mybrush;
    private const int cGrip = 16;      // Grip size
    private const int cCaption = 32;   // Caption bar height

    public Form1()
    {
        InitializeComponent();

        mybrush = new SolidBrush(this.BackColor);

        // Adds a new shortcut key that will invoke CreateNewForm every time Ctrl+F is pressed
        ShortcutKeys.Add(Keys.Control | Keys.F, CreateNewForm);

        this.FormBorderStyle = FormBorderStyle.None;
        this.DoubleBuffered = true;
        this.SetStyle(ControlStyles.ResizeRedraw, true);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip, this.ClientSize.Height - cGrip, cGrip, cGrip);
        ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
        rc = new Rectangle(0, 0, this.ClientSize.Width, cCaption);
        e.Graphics.FillRectangle(mybrush, rc);
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void Form1_Paint(object sender, PaintEventArgs e)
    {

    }

    /// <summary>
    /// Create a new instance of this form
    /// </summary>
    private void CreateNewForm()
    {
        new Form1().Show();
    }
}