C#使用tabcontrol控件可操作多窗体嵌入以及双击窗口名称可关闭

        public void Add_TabPage(string str, Form myForm)
        {
            if (tabControlCheckHave(this.MainTabControl, str)) { return; }
            else
            {
                MainTabControl.TabPages.Add(str);
                MainTabControl.SelectTab(MainTabControl.TabPages.Count - 1);
                myForm.FormBorderStyle = FormBorderStyle.None;
                myForm.TopLevel = false;
                myForm.Show();
                myForm.Parent = MainTabControl.SelectedTab;
            }

        }

        public bool tabControlCheckHave(System.Windows.Forms.TabControl tab, String tabName)
        {
            for (int i = 0; i < tab.TabCount; i++)
            {
                if (tab.TabPages[i].Text == tabName)
                {
                    tab.SelectedIndex = i;
                    return true;
                }
            }
            return false;
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            Form1 f1 = new Form1();
            Add_TabPage("f1窗体", f1);
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            Add_TabPage("f2窗体", f2);
        }

        private void MainTabControl_DrawItem(object sender, DrawItemEventArgs e)
        {
            try
            {
                Rectangle tabRect = this.MainTabControl.GetTabRect(e.Index);
                e.Graphics.DrawString(this.MainTabControl.TabPages[e.Index].Text, this.Font, SystemBrushes.ControlText, (float)(tabRect.X + 2), (float)(tabRect.Y + 2));
                using (Pen pen = new Pen(Color.White))
                {
                    tabRect.Offset(tabRect.Width - 15, 2);
                    tabRect.Width = 15;
                    tabRect.Height = 15;
                    e.Graphics.DrawRectangle(pen, tabRect);
                }
                Color color = (e.State == DrawItemState.Selected) ? Color.White : Color.White;
                using (Brush brush = new SolidBrush(color))
                {
                    e.Graphics.FillRectangle(brush, tabRect);
                }
                using (Pen pen2 = new Pen(Color.Black))
                {
                    Point point = new Point(tabRect.X + 3, tabRect.Y + 3);
                    Point point2 = new Point((tabRect.X + tabRect.Width) - 3, (tabRect.Y + tabRect.Height) - 3);
                    e.Graphics.DrawLine(pen2, point, point2);
                    Point point3 = new Point(tabRect.X + 3, (tabRect.Y + tabRect.Height) - 3);
                    Point point4 = new Point((tabRect.X + tabRect.Width) - 3, tabRect.Y + 3);
                    e.Graphics.DrawLine(pen2, point3, point4);
                    Point point5 = new Point(tabRect.X - 50, 4);
                }
                e.Graphics.Dispose();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void MainTabControl_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                int x = e.X;
                int y = e.Y;
                Rectangle tabRect = this.MainTabControl.GetTabRect(this.MainTabControl.SelectedIndex);
                tabRect.Offset(tabRect.Width - 0x12, 2);
                tabRect.Width = 15;
                tabRect.Height = 15;
                if ((((x > tabRect.X) && (x < tabRect.Right)) && (y > tabRect.Y)) && (y < tabRect.Bottom))
                {
                    this.MainTabControl.TabPages.Remove(this.MainTabControl.SelectedTab);
                }
            }
        }