C# TabControl增加关闭按钮

　　在窗体加载时,注册以下事件

　　　　this.MainTabControl.DrawMode = TabDrawMode.OwnerDrawFixed;
            this.MainTabControl.Padding = new System.Drawing.Point(CLOSE_SIZE, 5);
            this.MainTabControl.DrawItem += new DrawItemEventHandler(this.MainTabControl_DrawItem);
            this.MainTabControl.MouseDown += new System.Windows.Forms.MouseEventHandler(this.MainTabControl_MouseDown);

以下事件处理方法

const int CLOSE_SIZE = 15;
        //Bitmap image = new Bitmap("E:\\XX.gif");

        private void MainTabControl_DrawItem(object sender, DrawItemEventArgs e)
        {
            try
            {
                //获取当前Tab选项卡的绘图区域
                Rectangle myTabRect = this.MainTabControl.GetTabRect(e.Index);

                //绘制标签头背景色
                using (Brush brBack = new SolidBrush(Color.Yellow))
                {
                    if (e.Index == this.MainTabControl.SelectedIndex)
                    {
                        e.Graphics.FillRectangle(brBack, myTabRect); //设置当前选中的tabgage的背景色
                    }
                }

                //先添加TabPage属性
                e.Graphics.DrawString(this.MainTabControl.TabPages[e.Index].Text,
                    this.Font, SystemBrushes.ControlText, myTabRect.X + 2, myTabRect.Y + 2);

                //再画一个矩形框
                using (Pen p = new Pen(Color.Transparent))
                {
                    myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);
                    myTabRect.Width = CLOSE_SIZE;
                    myTabRect.Height = CLOSE_SIZE;
                    e.Graphics.DrawRectangle(p, myTabRect);
                }
                //填充矩形框
                Color recColor = (e.State == DrawItemState.Selected) ? Color.Transparent : Color.Transparent;
                using (Brush b = new SolidBrush(recColor))
                {
                    e.Graphics.FillRectangle(b, myTabRect);
                }

                //画Tab选项卡右上方关闭按钮  
                using (Pen objpen = new Pen(Color.SlateBlue, 1.8f))
                {
                    //自己画X
                    //"\"线
                    Point p1 = new Point(myTabRect.X + 3, myTabRect.Y + 3);
                    Point p2 = new Point(myTabRect.X + myTabRect.Width - 3, myTabRect.Y + myTabRect.Height - 3);
                    e.Graphics.DrawLine(objpen, p1, p2);
                    //"/"线
                    Point p3 = new Point(myTabRect.X + 3, myTabRect.Y + myTabRect.Height - 3);
                    Point p4 = new Point(myTabRect.X + myTabRect.Width - 3, myTabRect.Y + 3);
                    e.Graphics.DrawLine(objpen, p3, p4);

                    ////使用图片
                    //Bitmap bt = new Bitmap(image);
                    //Point p5 = new Point(myTabRect.X, 4);//获取绘图区域的开始坐标位置
                    //e.Graphics.DrawImage(bt, p5);
                }
                e.Graphics.Dispose();
            }
            catch (Exception)
            {

            }
        }
        //关闭按钮功能
        private void MainTabControl_MouseDown(object sender, MouseEventArgs e)
        {
            if (!String.IsNullOrEmpty(this.MainTabControl.SelectedTab.Text))
            {
                if (e.Button == MouseButtons.Left)
                {
                    int x = e.X, y = e.Y;

                    //计算关闭区域     
                    Rectangle myTabRect = this.MainTabControl.GetTabRect(this.MainTabControl.SelectedIndex); ;

                    //myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);
                    myTabRect.Offset(myTabRect.Width - 0x12, 2);
                    myTabRect.Width = CLOSE_SIZE;
                    myTabRect.Height = CLOSE_SIZE;

                    //如果鼠标在区域内就关闭选项卡     
                    bool isClose = x > myTabRect.X && x < myTabRect.Right && y > myTabRect.Y && y < myTabRect.Bottom;
                    if (isClose == true)
                    {
                        this.MainTabControl.TabPages.Remove(this.MainTabControl.SelectedTab);
                    }
                }
            }
        }