如果子文件夹和它们本身不包含任何文件，如何删除没有任何文件的子文件夹然后删除父文件夹

Question

我稍微修改了 codes 以仅使用 .PDF 文件填充我的 treeView1。它运行良好，除了留下许多空文件夹。是否有删除这些文件夹的方法？

  private void Begin()
    {
        treeView1.Nodes.Clear();
        if (Directory.Exists(FilePath))
            LoadDirectory(FilePath);
    }

    public void LoadDirectory(string Dir)
    {
        DirectoryInfo di = new DirectoryInfo(Dir);
        TreeNode tds = treeView1.Nodes.Add(di.Name);
        tds.Tag = di.FullName;
        tds.StateImageIndex = 0;
        LoadFiles(Dir, tds);
        LoadSubDirectories(Dir, tds);
    }

    private void LoadSubDirectories(string dir, TreeNode td)
    {
        // Get all subdirectories  
        string[] subdirectoryEntries = Directory.GetDirectories(dir);
        // Loop through them to see if they have any other subdirectories  
        foreach (string subdirectory in subdirectoryEntries)
        {
            DirectoryInfo di = new DirectoryInfo(subdirectory);
            TreeNode tds = td.Nodes.Add(di.Name);
            tds.StateImageIndex = 0;
            tds.Tag = di.FullName;
            LoadFiles(subdirectory, tds);
            LoadSubDirectories(subdirectory, tds);
        }
    }


    private void LoadFiles(string dir, TreeNode td)
    {
        string[] Files = Directory.GetFiles(dir, "*.PDF");
        // Loop through them to see files
        foreach (string file in Files)
        {
            FileInfo fi = new FileInfo(file);
            TreeNode tds = td.Nodes.Add(fi.Name);
            tds.Tag = fi.FullName;
            tds.StateImageIndex = 1;
        }
    }

Answer 1

我假设您在 TreeView 控件中留下了许多空文件夹，并且没有尝试清理文件系统。我这样做的方法是编写一个执行此清理的递归方法。递归允许我们遍历整个树并首先在最低级别采取行动，然后返回到根节点以确保 100% 的覆盖率，并尽可能少地进行额外处理。

这是实现此类解决方案的一种方法：

 private void CleanupEmptyNodes(TreeView thisTreeView)
    {
        List<TreeNode> emptyChildren = new List<TreeNode>();
        foreach (TreeNode topLevelNode in thisTreeView.Nodes)
        {
            var isEmpty = CleanupEmptyNodesRecursive(topLevelNode);
            if (isEmpty)
            {
                emptyChildren.Add(topLevelNode);
            }
        }
        foreach (TreeNode emptyChild in emptyChildren)
        {
            emptyChild.Remove();
        }
    }
    private bool CleanupEmptyNodesRecursive(TreeNode thisTreeNode)
    {
        List<TreeNode> emptyChildren = new List<TreeNode>();

        foreach(TreeNode node in thisTreeNode.Nodes)
        {
            var isEmpty = CleanupEmptyNodesRecursive(node);
            if (isEmpty)
            {
                emptyChildren.Add(node);
            }
        }

        //you can't delete the nodes from within the foreach
        foreach(TreeNode emptyChild in emptyChildren)
        {
            emptyChild.Remove();
        }
        
        //were all the nodes removed?
        if (thisTreeNode.Nodes.Count == 0)
        {
            if(/*perform test here to tell whether this node IS the file or not*/)
            {
                //is a file, so do not delete
                return false;
            }
            else
            {
                //this is a folder, and has no contents. Delete it!
                return true;
            }
        }
        else
        {
            //has files within it so do not delete
            return false;
        }
    }

那么你可以这样调用它：

CleanupEmptyNodes(treeView1);

就个人而言，我希望它成为一种扩展方法，这样我就可以 treeView1.CleanupEmptyNodes(); 但对每个人来说都是如此。

如果子文件夹和它们本身不包含任何文件，如何删除没有任何文件的子文件夹然后删除父文件夹

How to remove sub folders without any files then parent folders if their sub folders and themselves do not contain any files

c#

treeview