[英]populate treeview from a list of path
我正在尝试从文件夹路径列表填充树视图,例如:
C:\WINDOWS\addins
C:\WINDOWS\AppPatch
C:\WINDOWS\AppPatch\MUI
C:\WINDOWS\AppPatch\MUI\040C
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI\0409
像这样的输出:
├───addins
├───AppPatch
│ └───MUI
│ └───040C
├───Microsoft.NET
│ └───Framework
│ └───v2.0.50727
│ └───MUI
│ └───0409
请注意列表中没有'C:\\ WINDOWS \\ Microsoft.NET'或'C:\\ WINDOWS \\ Microsoft.NET \\ Framework'。 我已经工作了将近两天,我的代码中有一堆bug。 希望我能从这里得到帮助。
谢谢。
埃里克
private void Form1_Load(object sender, EventArgs e)
{
var paths = new List<string>
{
@"C:\WINDOWS\AppPatch\MUI\040C",
@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727",
@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI",
@"C:\WINDOWS\addins",
@"C:\WINDOWS\AppPatch",
@"C:\WINDOWS\AppPatch\MUI",
@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI\0409"
};
treeView1.PathSeparator = @"\";
PopulateTreeView(treeView1, paths, '\\');
}
private static void PopulateTreeView(TreeView treeView, IEnumerable<string> paths, char pathSeparator)
{
TreeNode lastNode = null;
string subPathAgg;
foreach (string path in paths)
{
subPathAgg = string.Empty;
foreach (string subPath in path.Split(pathSeparator))
{
subPathAgg += subPath + pathSeparator;
TreeNode[] nodes = treeView.Nodes.Find(subPathAgg, true);
if (nodes.Length == 0)
if (lastNode == null)
lastNode = treeView.Nodes.Add(subPathAgg, subPath);
else
lastNode = lastNode.Nodes.Add(subPathAgg, subPath);
else
lastNode = nodes[0];
}
}
}
对于linq'y版本:
public static TreeNode MakeTreeFromPaths(List<string> paths, string rootNodeName = "", char separator = '/')
{
var rootNode = new TreeNode(rootNodeName);
foreach (var path in paths.Where(x => !string.IsNullOrEmpty(x.Trim()))) {
var currentNode = rootNode;
var pathItems = path.Split(separator);
foreach (var item in pathItems) {
var tmp = currentNode.Nodes.Cast<TreeNode>().Where(x => x.Text.Equals(item));
currentNode = tmp.Count() > 0 ? tmp.Single() : currentNode.Nodes.Add(item);
}
}
return rootNode;
}
ehosca回答correcr,但是当我改变这样的路径时,有一点问题
C:\WINDOWS\AppPatch\MUI\040C
D:\WIS\Microsoft.NET\Framework\v2.0.50727
E:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI
C:\WINDOWS\addins
C:\WINDOWS\AppPatch
C:\WINDOWS\AppPatch\MUI
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI\0409
它将像这样流行树视图。
但是添加一些额外的代码我们可以避免这种情况。 所以我改变了PopulateTreeView中的代码
private static void PopulateTreeView(TreeView treeView, string[] paths, char pathSeparator)
{
TreeNode lastNode = null;
string subPathAgg;
foreach (string path in paths)
{
subPathAgg = string.Empty;
foreach (string subPath in path.Split(pathSeparator))
{
subPathAgg += subPath + pathSeparator;
TreeNode[] nodes = treeView.Nodes.Find(subPathAgg, true);
if (nodes.Length == 0)
if (lastNode == null)
lastNode = treeView.Nodes.Add(subPathAgg, subPath);
else
lastNode = lastNode.Nodes.Add(subPathAgg, subPath);
else
lastNode = nodes[0];
}
lastNode = null; // This is the place code was changed
}
}
现在它工作得很好
我拿了你的代码,它运行得很好,但是我做了一点修改,以提高加载速度,当它被用于大量的文件列表时,它似乎找到了操作,而字符串操作通常很慢
private TreeNode PopulateTreeNode2(string[] paths, string pathSeparator)
{
if (paths == null)
return null;
TreeNode thisnode = new TreeNode();
TreeNode currentnode;
char[] cachedpathseparator = pathSeparator.ToCharArray();
foreach (string path in paths) {
currentnode = thisnode;
foreach (string subPath in path.Split(cachedpathseparator))
{
if (null == currentnode.Nodes[subPath])
currentnode = currentnode.Nodes.Add(subPath, subPath);
else
currentnode = currentnode.Nodes[subPath];
}
}
return thisnode;
}
然后你可以使用:
string[] paths = {
@"C:\WINDOWS\AppPatch\MUI\040C",
@"D:\WINDOWS\Microsoft.NET\Framework\v2.0.50727",
@"E:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI",
@"C:\WINDOWS\addins",
@"C:\WINDOWS\AppPatch",
@"C:\WINDOWS\AppPatch\MUI",
@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\MUI\0409"
};
TreeView treeview = new TreeView();
treeview.Nodes.Add(PopulateTreeNode2(paths, "\\"));
注意:可能需要在两个解决方案中进行一些字符串灵敏度检查,以防止某些文件夹重新创建。
因为某些网址可能指向磁盘上的同一文件夹但拼写不同,例如:Windows;
WinDOWs,WINDOWS
这里有一些非常古老的代码我曾经用来从代码创建一个ASP.NET树视图(假设TreeView有一个TreeViewFolders的ID):
protected void Page_Load(object sender, EventArgs e)
{
GenerateTreeView(@"C:\WINDOWS\");
}
private void GenerateTreeView(string rootPath)
{
GetFolders(System.IO.Path.GetFullPath(rootPath), TreeViewFolders.Nodes);
TreeViewFolders.ExpandDepth = 1;
}
// recursive method to load all folders and files into tree
private void GetFolders(string path, TreeNodeCollection nodes)
{
// add nodes for all directories (folders)
string[] dirs = Directory.GetDirectories(path);
foreach (string p in dirs)
{
string dp = p.Substring(path.Length);
nodes.Add(Node("", p.Substring(path.Length), "folder"));
}
// add nodes for all files in this directory (folder)
string[] files = Directory.GetFiles(path, "*.*");
foreach (string p in files)
{
nodes.Add(Node(p, p.Substring(path.Length), "file"));
}
// add all subdirectories for each directory (recursive)
for (int i = 0; i < nodes.Count; i++)
{
if (nodes[i].Value == "folder")
GetFolders(dirs[i] + "\\", nodes[i].ChildNodes);
}
}
// create a TreeNode from the specified path, text and type
private TreeNode Node(string path, string text, string type)
{
TreeNode n = new TreeNode();
n.Value = type;
n.Text = text;
return n;
}
private void Form2_Load(object sender, EventArgs e)
{
treeView1.CheckBoxes = true;
foreach (TreeNode node in treeView1.Nodes)
{
node.Checked = true;
}
string[] drives = Environment.GetLogicalDrives();
foreach (string drive in drives)
{
// treeView1.Nodes[0].Nodes[1].Checked = true;
DriveInfo di = new DriveInfo(drive);
int driveImage;
switch (di.DriveType)
{
case DriveType.CDRom:
driveImage = 3;
break;
case DriveType.Network:
driveImage = 6;
break;
case DriveType.NoRootDirectory:
driveImage = 8;
break;
case DriveType.Unknown:
driveImage = 8;
break;
default:
driveImage = 2;
break;
}
TreeNode node = new TreeNode(drive.Substring(0, 1), driveImage, driveImage);
node.Tag = drive;
if (di.IsReady == true)
node.Nodes.Add("...");
treeView1.Nodes.Add(node);
}
foreach (TreeNode node in treeView1.Nodes)
{
node.Checked = true;
}
}
private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
{
if (e.Node.Nodes.Count > 0)
{
if (e.Node.Nodes[0].Text == "..." && e.Node.Nodes[0].Tag == null)
{
e.Node.Nodes.Clear();
string[] dirs = Directory.GetDirectories(e.Node.Tag.ToString());
foreach (string dir in dirs)
{
DirectoryInfo di = new DirectoryInfo(dir);
TreeNode node = new TreeNode(di.Name, 0, 1);
node.Checked = true;
try
{
node.Tag = dir;
if (di.GetDirectories().Count() > 0)
node.Nodes.Add(null, "...", 0, 0).Checked = node.Checked;
}
catch (UnauthorizedAccessException)
{
node.ImageIndex = 12;
node.SelectedImageIndex = 12;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "DirectoryLister", MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
finally
{
node.Checked = e.Node.Checked;
e.Node.Nodes.Add(node);
}
}
}
}
}
}
private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
{
button1.Enabled = false;
TreeNode node = e.Node;
bool is_checked = node.Checked;
foreach (TreeNode childNode in e.Node.Nodes)
{
childNode.Checked = e.Node.Checked;
}
treeView1.SelectedNode = node;
}
我设法只for
循环从路径列表创建一个树。 看起来这是目前这个问题最简单的答案。
使用此代码块创建树。 list
是您的文件或文件夹列表, treeView1
是您的TreeView。
//Creates a tree from given path list
foreach (string path in list)
{
TreeNodeCollection nodes = treeView1.Nodes;
foreach (string path_part in path.Split('\\'))
{
//Here it adds a new node (file or folder)
if (!nodes.ContainsKey(path_part))
nodes.Add(path_part, path_part);
//Go one node deeper
nodes = nodes[path_part].Nodes;
}
}
注意 - 如果您使用以路径分隔符开头的路径(例如/home/user
),这可能会中断
如果要删除路径的公共部分(或删除单个父节点),请在上一个之后使用此代码块:
//This removes "single" TreeNodes (common paths)
while (treeView1.Nodes.Count == 1)
{
//This "unpacks" child TreeNodes from the only parent TreeNode
for (int i = 0; i < treeView1.Nodes[0].Nodes.Count; i++)
treeView1.Nodes.Add(treeView1.Nodes[0].Nodes[i]);
//This removes parent TreeNode
treeView1.Nodes.RemoveAt(0);
}
如果所有路径都相同,这将生成一个空树。
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