C# TabControl 带删除

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;   namespace KUN.CONTROL.LIB.KTabControl {     public partial class KDelTabControl : TabControl     {         const int CLOSE_SIZE = 15;         //tabPage标签图片         Bitmap image = Properties.Resources.close;           public KDelTabControl()         {             InitializeComponent();               this.DrawMode = TabDrawMode.OwnerDrawFixed;             //this.Padding = new System.Drawing.Point(CLOSE_SIZE, CLOSE_SIZE);             this.DrawItem += new DrawItemEventHandler(this.KDelTabControl_DrawItem);             this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.KDelTabControl_MouseDown);         }           //绘制“Ｘ”号即关闭按钮         private void KDelTabControl_DrawItem(object sender, DrawItemEventArgs e)         {             try             {                 Rectangle tab = this.GetTabRect(e.Index);                 //先添加TabPage属性                   e.Graphics.DrawString(this.TabPages[e.Index].Text, this.Font, SystemBrushes.ControlText, tab.X + 2, tab.Y + 2);                 //再画一个矩形框                 using (Pen p = new Pen(Color.White))                 {                     tab.Offset(tab.Width - (CLOSE_SIZE + 3), 2);                     tab.Width = CLOSE_SIZE;                     tab.Height = CLOSE_SIZE;                     e.Graphics.DrawRectangle(p, tab);                 }                 //填充矩形框                 Color recColor = e.State == DrawItemState.Selected ? Color.White : Color.White;                 using (Brush b = new SolidBrush(recColor))                 {                     e.Graphics.FillRectangle(b, tab);                 }                 //画关闭符号                 using (Pen objpen = new Pen(Color.Black))                 {                     ////=============================================                     //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(tab.X, 4);                     e.Graphics.DrawImage(bt, p5);                     //e.Graphics.DrawString(this.MainTabControl.TabPages[e.Index].Text, this.Font, objpen.Brush, p5);                 }                 e.Graphics.Dispose();             }             catch (Exception)             { }         }           private void KDelTabControl_MouseDown(object sender, MouseEventArgs e)         {             if (e.Button == MouseButtons.Left)             {                 int x = e.X, y = e.Y;                 //计算关闭区域                   Rectangle tab = this.GetTabRect(this.SelectedIndex);                 tab.Offset(tab.Width - (CLOSE_SIZE + 3), 2);                 tab.Width = CLOSE_SIZE;                 tab.Height = CLOSE_SIZE;                 //如果鼠标在区域内就关闭选项卡                   bool isClose = x > tab.X && x < tab.Right && y > tab.Y && y < tab.Bottom;                                if (isClose == true) this.TabPages.Remove(this.SelectedTab);             }         }                            } }