新手。用TreeView和ListView控件在VS2008上做个本地资源浏览器，有误。。求助

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.IO;
using System.Management;namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //treeView1.Nodes.Coler
        ///   <summary>   
        ///   Form1   的摘要说明。   
        ///   </summary>   
        public class Form : System.Windows.Forms.Form
        {
            private System.Windows.Forms.TreeView treeView1;
            ///   <summary>   
            ///   必需的设计器变量。   
            ///   </summary>   
            private System.ComponentModel.Container components = null;            public Form()
            {
                //   
                //   Windows   窗体设计器支持所必需的   
                //   
                InitializeComponent();                //   
                //   TODO:   在   InitializeComponent   调用后添加任何构造函数代码   
                //   
            }            ///   <summary>   
            ///   清理所有正在使用的资源。   
            ///   </summary>   
            protected override void Dispose(bool disposing)
            {
                if (disposing)
                {
                    if (components != null)
                    {
                        components.Dispose();
                    }
                }
                base.Dispose(disposing);
            }            #region   Windows   窗体设计器生成的代码
            ///   <summary>   
            ///   设计器支持所需的方法   -   不要使用代码编辑器修改   
            ///   此方法的内容。   
            ///   </summary>   
            private void InitializeComponent()
            {
                this.treeView1 = new System.Windows.Forms.TreeView();
                this.SuspendLayout();
                //     
                //   treeView1   
                //     
                this.treeView1.ImageIndex = -1;
                this.treeView1.Location = new System.Drawing.Point(8, 16);
                this.treeView1.Name = "treeView1";
                this.treeView1.SelectedImageIndex = -1;
                this.treeView1.Size = new System.Drawing.Size(272, 232);
                this.treeView1.TabIndex = 0;
                this.treeView1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.treeView1_MouseDown);
                this.treeView1.DoubleClick += new System.EventHandler(this.treeView1_DoubleClick);
                this.treeView1.BeforeExpand += new System.Windows.Forms.TreeViewCancelEventHandler(this.treeView1_BeforeExpand);
                //     
                //   Form1   
                //     
                this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
                this.ClientSize = new System.Drawing.Size(292, 273);
                this.Controls.Add(this.treeView1);
                this.Name = "Form1";
                this.Text = "Form1";
                this.Load += new System.EventHandler(this.Form1_Load);
                this.ResumeLayout(false);            }
            #endregion            ///   <summary>   
            ///   应用程序的主入口点。   
            ///   </summary>   
            
            private LoadDir loadDir;
            string filter = "";
            private void Form1_Load(object sender, System.EventArgs e)
            {
                loadDir = LoadDir.CreateIntance();
                treeView1.Nodes.Add(loadDir.Drives());
            }            private void treeView1_DoubleClick(object sender, System.EventArgs e)
            {
                if (treeView1.SelectedNode == null || treeView1.SelectedNode.Parent == null)//跟目录   
                    return;
                try
                {
                    loadDir.ChildChildNodes(treeView1.SelectedNode, filter, true);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }            private void treeView1_BeforeExpand(object sender, System.Windows.Forms.TreeViewCancelEventArgs e)
            {
                if (treeView1.SelectedNode == null || treeView1.SelectedNode.Parent == null)//跟目录   
                    return;
                loadDir.ChildChildNodes(e.Node, filter, true);
            }            private void treeView1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
            {
                treeView1.SelectedNode = treeView1.GetNodeAt(e.X, e.Y);
            }
        }        ///   <summary>   
        ///   加载文件目录，singleton   
        ///   </summary>   
        public class LoadDir
        {
            private static LoadDir ld;
            private LoadDir()
            {
            }
            ///   <summary>   
            ///   创建实例   
            ///   </summary>   
            ///   <returns>实例</returns>   
            public static LoadDir CreateIntance()
            {
                if (ld == null)
                    ld = new LoadDir();
                return ld;
            }
            ///   <summary>   
            ///   加载磁盘列表   
            ///   </summary>   
            /////   <returns>磁盘列表树结构</returns>   
            public TreeNode Drives()
            {
                TreeNode treeNode_myComp = new TreeNode("我的电脑", 0, 0);                System.Management.SelectQuery query = new System.Management.SelectQuery("Select   *   From   Win32_LogicalDisk");
                System.Management.ManagementObjectSearcher searcher = new System.Management.ManagementObjectSearcher(query);
                try
                {
                    foreach (ManagementBaseObject disk in searcher.Get())
                    {
                        if (Convert.ToInt32(disk["DriveType"]) == 3)
                        {
                            TreeNode tn = new TreeNode();
                            tn.Text = disk["VolumeName"].ToString() + "(" + disk["Name"].ToString() + ")";
                            tn.Tag = disk["Name"].ToString() + "\\";
                            treeNode_myComp.Nodes.Add(tn);
                            ChildNodes(tn, "false" );
                        }
                    }
                }
                catch
                { }                return treeNode_myComp;
            }            private void ChildNodes(TreeNode tn, string p)
            {
                throw new NotImplementedException();
            }
            internal void ChildChildNodes(TreeNode treeNode, string filter, bool p)
            {
                throw new NotImplementedException();
            }
        }
            ///   <summary>   
            ///   加载目录及文件   
            ///   </summary>   
            ///   <param   name="selectedTreeNode"></param>   
            ///   <param   name="p_filter"></param>   
            ///   <param   name="Expand"></param>   
            ///   <returns></returns>   
            public TreeNode ChildNodes(TreeNode selectedTreeNode, string p_filter, bool Expand)
            {
                if (File.Exists(selectedTreeNode.Tag.ToString()) != true)//目录而非文件   
                {
                    if (selectedTreeNode.GetNodeCount(false) <= 0)//没打开过   
                    {
                        try
                        {
                            foreach (string s in Directory.GetDirectories(selectedTreeNode.Tag.ToString()))
                            {
                                TreeNode tn = new TreeNode();
                                tn.Tag = s;
                                tn.Text = s.Split('\\')[(s.Split('\\').Length - 1)];
                                selectedTreeNode.Nodes.Add(tn);
                            }
                            foreach (string s in Directory.GetFiles(selectedTreeNode.Tag.ToString()))
                            {
                                TreeNode tn = new TreeNode();
                                tn.Tag = s;
                                tn.Text = s.Split('\\')[(s.Split('\\').Length - 1)];
                                selectedTreeNode.Nodes.Add(tn);
                            }
                            if (Expand == true)
                                selectedTreeNode.Expand();
                        }
                        catch
                        {
                        }
                    }
                }
                return selectedTreeNode;
            }
            ///   <summary>   
            ///   取子级目录及文件   
            ///   </summary>   
            ///   <param   name="selectedTreeNode"></param>   
            ///   <param   name="p_filter"></param>   
            ///   <param   name="Expand"></param>   
            ///   <returns></returns>   
            public TreeNode ChildChildNodes(TreeNode selectedTreeNode, string p_filter, bool Expand)
            {
                try
                {
                    foreach (TreeNode tn in selectedTreeNode.Nodes)
                    {
                        if (File.Exists(tn.Tag.ToString()) != true)//目录而非文件   
                        {
                            ChildNodes(tn, p_filter, false);
                        }
                    }
                }
                catch
                {
                }
                return selectedTreeNode;
            }            public TreeNode ChildNodes(TreeNode selectedTreeNode)
            {
                return ChildNodes(selectedTreeNode, "", false);
            }        }
    }提示没有错误了。。可是为什么什么都不显示呢。是不是接口连接错误来个高手帮下。小弟新手不懂得较多。。在线等