ASP.NET C# listing directory structure into a listbox

Question

I want to list all the folders and their subfolders and theirs till reaching to deepest folder.

I have written a method like this:

public void scanFolders(string path)
{
    foreach (var dir in new DirectoryInfo(path).GetDirectories("*", SearchOption.AllDirectories))
    {
        listBox_Folders.Items.Add(dir.Name);
    }
}

This brings me all the folders and subfolders. It is OK

But I need a little different solution. I want to list subfolders of a folder just beneath its parent starting with a hyphen (-).

It should look like

<select>
    <option>folder1</option>
    <option>-subfolder11</option>
    <option>folder2</option>
    <option>-subfolder21</option>
    <option>-subfolder22</option>
</select>

What I have is

<select>
    <option>folder1</option>
    <option>folder2</option>
    <option>subfolder11</option>
    <option>subfolder21</option>
    <option>subfolder22</option>
</select>

Why can't you try to load on demand, sub folder data when user click on the folder. — Bhasyakarulu Kottakota
– Bhasyakarulu Kottakota, Commented Sep 22, 2014 at 19:24

Pafka · Accepted Answer · 2014-09-22 19:31:15Z

1

You can use recursion

    private void ScanFolder(String prefix, String path)
    {
        foreach (var dir in new DirectoryInfo(path).GetDirectories("*", SearchOption.TopDirectoryOnly))
        {
            listBox_Folders.Items.Add(prefix + dir.Name);

            ScanFolder(prefix + "-", dir.FullName);
        }
    }

First call like ScanFolder(String.Empty, 'yourpathhere');

answered Sep 22, 2014 at 19:31

Pafka

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Comments

Claudio Redi · Accepted Answer · 2014-09-22 19:23:58Z

1

Try adding a sort by FullName before iterating.

    foreach (var dir in new DirectoryInfo(path)
        .GetDirectories("*", SearchOption.AllDirectories)
        .OrderBy(d => d.FullName))
    {
        listBox_Folders.Items.Add(dir.Name);
    }

answered Sep 22, 2014 at 19:23

Claudio Redi

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2 Comments

zkanoca Over a year ago

OrderBy is not accepted. I mean it is underlined with red line. Could it be a version issue? I use VS2010.

Claudio Redi Over a year ago

@Please check if you have System.Linq namespace included

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