利用WinForm实现上左右布局的方法详解

System.windows.Forms.ContextMenuStrip MenuStrip = new ContextMenuStrip();
        public UserTabpage()
        {
            InitializeComponent();
            DrawMode = TabDrawMode.OwnerDrawFixed;
            SizeMode = TabSizeMode.Fixed;
            ItemSize = new Size(100, 24);
           


            MenuStrip.Items.Add(new System.Windows.Forms.ToolStripLabel("关闭其他", null, false, (s, e) =>
            {
                for (int i = 0; i < TabPages.Count; i++)
                {
                    if (i != SelectedIndex)
                    {
                        TabPages.RemoveAt(i);
                        i--;
                    }
                }
            }));


            MenuStrip.Items.Add(new System.Windows.Forms.ToolStripLabel("关闭所有", null, false, (s, e) =>
            {
                for (int i = 0; i < TabPages.Count; i++)
                {
                    TabPages.RemoveAt(i);
                    i--;
                }
            }));


        }


        protected override void OnDrawItem(DrawItemEventArgs e)
        {
            base.OnDrawItem(e);
            try
            {
                Rectangle rect = GetTabRect(e.Index);
                string title = TabPages[e.Index].Text;
                if (title.Length > 5)
                {
                    title = title.SubStringByte(10) + "..";
                }
                Brush brush = new SolidBrush(Color.Black);
                Font font = new Font("宋体", 10);


                e.Graphics.DrawString(title, font, brush, new PointF(rect.X + 2, rect.Y + 5));


                e.Graphics.DrawString("X", font, new SolidBrush(Color.OrangeRed), new Point((e.Index + 1) * rect.Width - 15, rect.Y + 5));


                Point x1 = new Point(rect.X, rect.Height);
                Point x2 = new Point((e.Index + 1) * rect.Width, rect.Height);
                if (e.Index == SelectedIndex)
                {
                    e.Graphics.DrawLine(new Pen(Color.Red, 1), x1, x2);
                }
                else
                {
                    e.Graphics.DrawRectangle(new Pen(Color.White, 1), rect);
                }


            }
            catch { }


        }
        protected override void OnMouseClick(MouseEventArgs e)
        {
            base.OnMouseClick(e);
            try
            {
                Point point = e.Location;
                if (e.Button == MouseButtons.Left)
                {
                    Rectangle rect = GetTabRect(SelectedIndex);
                    if (point.X >= (SelectedIndex + 1) * rect.Width - 15)
                    {
                        TabPages.Remove(SelectedTab);
                    }


                }
                else if (e.Button == MouseButtons.Right)
                {
                    for (int i = 0; i < TabPages.Count; i++)
                    {
                        if (GetTabRect(i).Contains(point))
                        {
                            Point p = this.PointToScreen(new Point(e.X, e.Y));
                            SelectedIndex = i;
                            MenuStrip.Show(p);
                            return;
                        }
                    }
                }
            }
            catch { }
        }

  private void MainForm_Load(object sender, EventArgs e)
        {
            Treenode node = new TreeNode("Form1");
            node.Name = "Form1";
            treeMenu.Nodes.Add(node);
            node = new TreeNode("Form2");
            node.Name = "Form2";
            treeMenu.Nodes.Add(node);
        }


        private void ShowForm(string name, string text)
        {
            try
            {
                foreach (TabPage page in tabForm.TabPages)
                {
                    if (page.Text == text)
                    {
                        tabForm.SelectedTab = page;
                        return;
                    }
                }
                Type t = this.GetType();
                Assembly ass = this.GetType().Assembly;
                Type type = ass.GetType(Assembly.GetExecutingAssembly().GetName().Name + "." + name);


                Form form = System.Activator.CreateInstance(type) as Form;
                form.TopLevel = false;
                form.Text = text;
                form.FormBorderStyle = FormBorderStyle.None;
                form.Dock = DockStyle.Fill;


                TabPage tabPage = new TabPage(form.Text);
                tabPage.AutoScroll = true;
                tabPage.Controls.Add(form);
                tabForm.TabPages.Add(tabPage);
                tabForm.SelectedTab = tabPage;


                form.Show();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }


        private void treeMenu_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (!string.IsNullOrEmpty(e.Node.Name))
            {
                ShowForm(e.Node.Name, e.Node.Text);
            }
        }