using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Reflection;

namespace WinFormDemo

{

    public partial class FrmMain : Form

    {

        public FrmMain()

        {

            InitializeComponent();

        }

        private void tvMenu_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)

        {

            if (null != e.Node.Parent)

            {

                if ( == e.Node.Nodes.Count)

                {

                    ShowForm(e.Node.Text);

                }

            }

        }

        private void ShowForm(string strFormName)

        {

            Form frm = GetForm(strFormName);

            frm.BringToFront();

            frm.Show();

        }

        private Form GetForm(string strFormName)

        {

            Control.ControlCollection ctrls = pnlCentral.Controls;

            if (ctrls.ContainsKey(strFormName))

            {

                return ctrls[strFormName] as Form;

            }

            else

            {

                Assembly assembly = Assembly.GetExecutingAssembly();

                Type type = assembly.GetTypes().Where(item => item.Name.Equals(strFormName)).FirstOrDefault();

                Form frm = assembly.CreateInstance(type.FullName) as Form;

                frm.Name = strFormName;

                frm.TopLevel = false;

                frm.Dock = DockStyle.Fill;

                frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

                pnlCentral.Controls.Add(frm);

                return frm;

            }

        }

    }

}