treeview控件显示指定目录下的目录和文件

此处显示的文件是指定的音乐文件（*.mp3，*.wav,*.wma），要想查询指定的文件，只需把扩展替换一下即可

//窗体加载

private void Library_Load(object sender, EventArgs e)
        {

　　　　
           TreeNode root = new TreeNode("C:\\");
            treeView1.Nodes.Add(root);
            CreateDirTree("C:\\", root);

        }

//自定义的递归函数

private void CreateDirTree(string dir,TreeNode parentNode)
        {
            DirectoryInfo dirInfo=new DirectoryInfo(dir);
            //用于查询目录
            DirectoryInfo[] arrDir = dirInfo.GetDirectories();
            //用于查询音乐文件
            FileInfo[] arrFile = dirInfo.GetFiles();
            try
            {
                if (arrDir.Length != 0)
                {
                    foreach (DirectoryInfo d in arrDir)
                    {
                        TreeNode newDir = new TreeNode(d.Name);
                        parentNode.Nodes.Add(newDir);
                        createDirTree(d.FullName, newDir);
                    }
                }
                if(arrFile.Length!=0)
                {
                    foreach (FileInfo f in arrFile)
                    {
                        TreeNode newFile = new TreeNode(f.Name);
                        if(f.Name.EndsWith(".mp3")||f.Name.EndsWith(".wav")||f.Name.EndsWith(".wma"))
                            parentNode.Nodes.Add(newFile);
                     }
                }
            }
        }