Question

我正在尝试从文件夹路径列表中填充树视图，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

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。

感谢。

埃里克

Answer 1

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];
            }
        }
    }

alt text

Answer 2

对于linq＆＃39; 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;
}

Answer 3

ehosca回答相关问题，但有一点问题，当我改变这样的路径时

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

它会像这样看到树视图。

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 } }

现在它可以正常工作

Answer 4

我拿了你的代码，它运作得很好，但我做了一点改进，以提高负载速度当它用于大量文件时它看起来像find操作，而字符串操作一般都很慢

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：两种解决方案都可能需要进行一些字符串灵敏度检查，为了防止一些文件夹重新创建。~~

~~因为某些网址可能指向磁盘上的同一文件夹但拼写不同，如： Windows; WinDOWs，WINDOWS~~

Answer 5

以下是我曾经用于从代码创建ASP.NET树视图的一些非常旧的代码（假设TreeView的ID为TreeViewFolders）：

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;
}

Answer 6

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;
 }

Answer 7

此代码填充Windows窗体的TreeView控件。它比给定的答案简单得多。

using System;
using System.Windows.Forms;
using System.IO;

// ...
    private void Form1_Load(object sender, EventArgs e)
    {
        treeView1.Nodes.Add(@"C:\");
        treeView1.Nodes[0].Tag = @"C:\";
        Populate((string)treeView1.Nodes[0].Tag, treeView1.Nodes[0]);
    }

    private void Populate(string address, TreeNode rootNode)
    {
        DirectoryInfo[] directories = new DirectoryInfo(address).GetDirectories();
        foreach (DirectoryInfo directory in directories)
        {
            TreeNode newNode = new TreeNode(directory.Name);
            rootNode.Nodes.Add(newNode);
            newNode.Tag = directory.FullName;

            try
            {
                DirectoryInfo[] innerDirectories = new DirectoryInfo(directory.FullName).GetDirectories();
                if (innerDirectories.Length > 0)
                    newNode.Nodes.Add(new TreeNode());

                FileInfo[] innerFiles = new DirectoryInfo(directory.FullName).GetFiles();
                if (innerFiles.Length > 0)
                    newNode.Nodes.Add(new TreeNode());
            }

            catch
            {
                continue;
            }
        }

        FileInfo[] files = new DirectoryInfo(address).GetFiles();
        foreach (FileInfo file in files)
            rootNode.Nodes.Add(file.Name);
    }

    private void treeView1_AfterExpand(object sender, TreeViewEventArgs e)
    {
        if (e.Node.Nodes.Count < 3)
        {
            e.Node.Nodes.Clear();
            Populate((string)e.Node.Tag, e.Node);
        }
    }

Answer 8

我设法仅使用for个循环就从路径列表中创建了树。看来这是此刻最简单的答案。

使用此代码块创建树。 list是文件或文件夹的列表，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-如果将其与以路径分隔符开头的路径（例如/home/user）一起使用，则可能会中断

如果要删除路径的公共部分（或删除单个父节点），请在上一个代码之后立即使用此代码块：

//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，则会生成一棵空树。

从路径列表填充树视图

8 个答案: