C# WinForm控件移动调整大小

 class ControlComponent
    {
        #region 实现窗体内的控件拖动
        //用法：在Form初始化或者Form_Load时先执行
        //DragComponent a = new DragComponent();
        //a.initProperty(groupBox1);
        //将界面groupBox1上的所有控件都绑定MyMouseDown、MyMouseLeave、MyMouseMove事件。 

        private Control control;
        const int Band = 5;
        const int MinWidth = 10;
        const int MinHeight = 10;
        private EnumMousePointPosition m_MousePointPosition;
        private Point p, p1;

        public enum EnumMousePointPosition
        {

            MouseSizeNone = 0, //'无

            MouseSizeRight = 1, //'拉伸右边框

            MouseSizeLeft = 2, //'拉伸左边框

            MouseSizeBottom = 3, //'拉伸下边框

            MouseSizeTop = 4, //'拉伸上边框

            MouseSizeTopLeft = 5, //'拉伸左上角

            MouseSizeTopRight = 6, //'拉伸右上角

            MouseSizeBottomLeft = 7, //'拉伸左下角

            MouseSizeBottomRight = 8, //'拉伸右下角

            MouseDrag = 9 // '鼠标拖动

        }

        public void MyMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {

            p.X = e.X;

            p.Y = e.Y;

            p1.X = e.X;

            p1.Y = e.Y;

        }

        public void MyMouseLeave(object sender, System.EventArgs e)
        {

            m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;

            control.Cursor = Cursors.Arrow;

        }

        public EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)
        {

            if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))
            {

                if (e.X < Band)
                {

                    if (e.Y < Band)
                    {
                        return EnumMousePointPosition.MouseSizeTopLeft;
                    }

                    else
                    {

                        if (e.Y > -1 * Band + size.Height)
                        {
                            return EnumMousePointPosition.MouseSizeBottomLeft;
                        }

                        else
                        {
                            return EnumMousePointPosition.MouseSizeLeft;
                        }

                    }

                }

                else
                {

                    if (e.X > -1 * Band + size.Width)
                    {

                        if (e.Y < Band)
                        {
                            return EnumMousePointPosition.MouseSizeTopRight;
                        }

                        else
                        {

                            if (e.Y > -1 * Band + size.Height)
                            {
                                return EnumMousePointPosition.MouseSizeBottomRight;
                            }

                            else
                            {
                                return EnumMousePointPosition.MouseSizeRight;
                            }

                        }

                    }

                    else
                    {

                        if (e.Y < Band)
                        {
                            return EnumMousePointPosition.MouseSizeTop;
                        }

                        else
                        {

                            if (e.Y > -1 * Band + size.Height)
                            {
                                return EnumMousePointPosition.MouseSizeBottom;
                            }

                            else
                            {
                                return EnumMousePointPosition.MouseDrag;
                            }

                        }

                    }

                }

            }

            else
            {
                return EnumMousePointPosition.MouseSizeNone;
            }

        }

        public void MyMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {

            Control lCtrl = (sender as Control);
            if (e.Button == MouseButtons.Left)
            {

                switch (m_MousePointPosition)
                {

                    case EnumMousePointPosition.MouseDrag:

                        lCtrl.Left = lCtrl.Left + e.X - p.X;

                        lCtrl.Top = lCtrl.Top + e.Y - p.Y;

                        break;

                    case EnumMousePointPosition.MouseSizeBottom:

                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

                        p1.X = e.X;

                        p1.Y = e.Y; //'记录光标拖动的当前点

                        break;

                    case EnumMousePointPosition.MouseSizeBottomRight:

                        lCtrl.Width = lCtrl.Width + e.X - p1.X;

                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

                        p1.X = e.X;

                        p1.Y = e.Y; //'记录光标拖动的当前点

                        break;

                    case EnumMousePointPosition.MouseSizeRight:

                        lCtrl.Width = lCtrl.Width + e.X - p1.X;

                        //      lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

                        p1.X = e.X;

                        p1.Y = e.Y; //'记录光标拖动的当前点

                        break;

                    case EnumMousePointPosition.MouseSizeTop:

                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

                        break;

                    case EnumMousePointPosition.MouseSizeLeft:

                        lCtrl.Left = lCtrl.Left + e.X - p.X;

                        lCtrl.Width = lCtrl.Width - (e.X - p.X);

                        break;

                    case EnumMousePointPosition.MouseSizeBottomLeft:

                        lCtrl.Left = lCtrl.Left + e.X - p.X;

                        lCtrl.Width = lCtrl.Width - (e.X - p.X);

                        lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

                        p1.X = e.X;

                        p1.Y = e.Y; //'记录光标拖动的当前点

                        break;

                    case EnumMousePointPosition.MouseSizeTopRight:

                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

                        lCtrl.Width = lCtrl.Width + (e.X - p1.X);

                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

                        p1.X = e.X;

                        p1.Y = e.Y; //'记录光标拖动的当前点

                        break;

                    case EnumMousePointPosition.MouseSizeTopLeft:

                        lCtrl.Left = lCtrl.Left + e.X - p.X;

                        lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

                        lCtrl.Width = lCtrl.Width - (e.X - p.X);

                        lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

                        break;

                    default:

                        break;

                }

                if (lCtrl.Width < MinWidth) lCtrl.Width = MinWidth;

                if (lCtrl.Height < MinHeight) lCtrl.Height = MinHeight;

            }

            else
            {

                m_MousePointPosition = MousePointPosition(lCtrl.Size, e); //'判断光标的位置状态

                switch (m_MousePointPosition) //'改变光标
                {

                    case EnumMousePointPosition.MouseSizeNone:

                        control.Cursor = Cursors.Arrow;       //'箭头

                        break;

                    case EnumMousePointPosition.MouseDrag:

                        control.Cursor = Cursors.SizeAll;     //'四方向

                        break;

                    case EnumMousePointPosition.MouseSizeBottom:

                        control.Cursor = Cursors.SizeNS;      //'南北

                        break;

                    case EnumMousePointPosition.MouseSizeTop:

                        control.Cursor = Cursors.SizeNS;      //'南北

                        break;

                    case EnumMousePointPosition.MouseSizeLeft:

                        control.Cursor = Cursors.SizeWE;      //'东西

                        break;

                    case EnumMousePointPosition.MouseSizeRight:

                        control.Cursor = Cursors.SizeWE;      //'东西

                        break;

                    case EnumMousePointPosition.MouseSizeBottomLeft:

                        control.Cursor = Cursors.SizeNESW;    //'东北到南西

                        break;

                    case EnumMousePointPosition.MouseSizeBottomRight:

                        control.Cursor = Cursors.SizeNWSE;    //'东南到西北

                        break;

                    case EnumMousePointPosition.MouseSizeTopLeft:

                        control.Cursor = Cursors.SizeNWSE;    //'东南到西北

                        break;

                    case EnumMousePointPosition.MouseSizeTopRight:

                        control.Cursor = Cursors.SizeNESW;    //'东北到南西

                        break;

                    default:

                        break;

                }

            }
        }

        public void initProperty(Control ctl)
        {
            control = ctl;
            control.MouseDown += new System.Windows.Forms.MouseEventHandler(MyMouseDown);
            control.MouseLeave += new System.EventHandler(MyMouseLeave);
            control.MouseMove += new System.Windows.Forms.MouseEventHandler(MyMouseMove);

        }

        #endregion

    }

使用方法：

ControlComponent cc= new ControlComponent();

            cc.initProperty(你需要改变的控件);