TabControl添加关闭按钮

const int CLOSE_SIZE = 4;

//清空控件
this.MainTabControl.TabPages.Clear();
//绘制的方式OwnerDrawFixed表示由窗体绘制大小也一样
this.MainTabControl.DrawMode = TabDrawMode.OwnerDrawFixed;
this.MainTabControl.Padding = new System.Drawing.Point(CLOSE_SIZE, CLOSE_SIZE);
this.MainTabControl.DrawItem += new DrawItemEventHandler(this.tabControl2_DrawItem);
this.MainTabControl.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tabControl2_MouseDown);

private void tabControl2_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
{
try
{
Rectangle myTabRect = this.MainTabControl.GetTabRect(e.Index);

//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.Red))
{
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.Red : Color.Red;
using (Brush b = new SolidBrush(recColor))
{
e.Graphics.FillRectangle(b, myTabRect);
}

//画关闭符号
using (Pen objpen = new Pen(Color.Red))
{
//"\"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);
}

e.Graphics.Dispose();
}
catch (Exception)
{

}
}

private void tabControl2_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
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.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);
}
}
}