使用WinForms TreeView递归目录列表? [英] Recursive directory listing using WinForms TreeView?

问题描述

我想制作一个树状视图，以显示系统上的所有文件夹，并且仅显示音乐文件，例如.mp3 .aiff .wav等.

I want to make a treeview that shows all folders on the system, and only shows music files, such as .mp3 .aiff .wav etc.

我记得读过我需要使用递归函数或类似的东西.

I remember reading that I need to use a recursive function or something along those lines.

推荐答案

通常，大多数计算机都具有成千上万个文件夹和成千上万个文件，因此以递归方式在TreeView中全部显示它们会很慢，并且会占用大量内存，请在此问题中查看我的答案，并引用我的答案并进行一些修改，以便在可以使用时变得非常有用. GUI:

Usually most computers have thousands of folders and hundreds of thousands of files, so displaying all of them in a TreeView recursively with be very slow and consume a lot of memory, view my answer in this question, citing my answer with some modifications when can get a pretty usable GUI:

// Handle the BeforeExpand event
private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
   if (e.Node.Tag != null) {
       AddDirectoriesAndMusicFiles(e.Node, (string)e.Node.Tag);
   }
}

private void AddDirectoriesAndMusicFiles(TreeNode node, string path)
{
    node.Nodes.Clear(); // clear dummy node if exists

    try {
        DirectoryInfo currentDir = new DirectoryInfo(path);
        DirectoryInfo[] subdirs = currentDir.GetDirectories();

        foreach (DirectoryInfo subdir in subdirs) {
            TreeNode child = new TreeNode(subdir.Name);
            child.Tag = subdir.FullName; // save full path in tag
            // TODO: Use some image for the node to show its a music file

            child.Nodes.Add(new TreeNode()); // add dummy node to allow expansion
            node.Nodes.Add(child);
        }

        List<FileInfo> files = new List<FileInfo>();
        files.AddRange(currentDir.GetFiles("*.mp3"));
        files.AddRange(currentDir.GetFiles("*.aiff"));
        files.AddRange(currentDir.GetFiles("*.wav")); // etc

        foreach (FileInfo file in files) {
            TreeNode child = new TreeNode(file.Name);
            // TODO: Use some image for the node to show its a music file

            child.Tag = file; // save full path for later use
            node.Nodes.Add(child);
        }

    } catch { // try to handle use each exception separately
    } finally {
        node.Tag = null; // clear tag
    }
}

private void MainForm_Load(object sender, EventArgs e)
{
    foreach (DriveInfo d in DriveInfo.GetDrives()) {
        TreeNode root = new TreeNode(d.Name);
        root.Tag = d.Name; // for later reference
        // TODO: Use Drive image for node

        root.Nodes.Add(new TreeNode()); // add dummy node to allow expansion
        treeView1.Nodes.Add(root);
    }
}

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