关于Microsoft.Web.UI.WebControls.TreeView控件

给你一段代码作为参考：
treeview的源代码作者：不详  
2001-11-21 1:35:42 [被查看:2次]    （推荐作品） --------------------------------------------------------------------------------
 
 
using System;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
using System.IO;class FolderDialog:Form
{
TreeView FolderTree;
ImageList FolderTreeIcons;
TreeNode RootNode;
string[] IconFileNames={"MyComp.ico","Drive.ico","OpenFold.ico","ClsdFold.ico"};
public FolderDialog()
{
//Manipulate ImageList
FolderTreeIcons=new ImageList();
for(int i=0;i<IconFileNames.Length;i++)
{
FolderTreeIcons.Images.Add(Image.FromFile(@"Images\" + IconFileNames));
}//Setting Properties for TreeView
FolderTree=new TreeView();
FolderTree.AfterSelect+=new TreeViewEventHandler(Node_Select);
FolderTree.ImageList=FolderTreeIcons;
FolderTree.Anchor=AnchorStyles.Top|AnchorStyles.Bottom|AnchorStyles.Left|AnchorStyles.Right;
//Root Node
RootNode=new TreeNode();
RootNode.Text="My Computer";
RootNode.Tag="My Computer";
RootNode.ImageIndex=0;
FolderTree.Nodes.Add(RootNode);
FolderTree.SelectedNode=RootNode;
FolderTree.SelectedNode.ImageIndex=0;this.Text="Browse For Folder";
this.Size=new Size(300,300);
FolderTree.Size=new Size(290,275);this.Controls.Add(FolderTree);
}private void EnumDrives(TreeNode ParentNode)
{
if(ParentNode.Nodes.Count==0)
{ 
foreach(string drive in Directory.GetLogicalDrives())
{
FolderTree.SelectedNode=ParentNode;
TreeNode TempNode=new TreeNode();
TempNode.Text=drive.Substring(0,drive.Length-1);
TempNode.Tag=drive;
TempNode.ImageIndex=1;
TempNode.SelectedImageIndex=1; 
FolderTree.SelectedNode.Nodes.Add(TempNode);
FolderTree.SelectedNode.Nodes[FolderTree.SelectedNode.Nodes.Count-1].EnsureVisible();
}
}
}private void EnumDirectories(TreeNode ParentNode)
{
FolderTree.SelectedNode=ParentNode;
string DirectoryPath=ParentNode.Tag.ToString();
if(ParentNode.Nodes.Count==0)
{
if(DirectoryPath.Substring(DirectoryPath.Length-1)!=@"\")
DirectoryPath+=@"\";
try
{
foreach(string directory in Directory.GetDirectories(DirectoryPath))
{
TreeNode TempNode=new TreeNode();
TempNode.Text=directory.Substring(directory.LastIndexOf(@"\")+1);
TempNode.Tag=directory;
TempNode.ImageIndex=3;
TempNode.SelectedImageIndex=2;
FolderTree.SelectedNode.Nodes.Add(TempNode);
FolderTree.SelectedNode.Nodes[FolderTree.SelectedNode.Nodes.Count-1].EnsureVisible();
}
}
catch(Exception)
{
}
}
}private void Node_Select(object sender,TreeViewEventArgs e)
{
if(e.Node.Tag.ToString()!="My Computer")
EnumDirectories(e.Node);
else
EnumDrives(e.Node);
}public static void Main()
{
Application.Run(new FolderDialog());
}
}
在一打开这个页面就将tree展开 可以在Form_Load()中
treeView1.Nodes[0].ExpandAll()  这是展开0节点下的所有子节点