Combobox and listbox folder and files

Question

5.00/5 (1 vote)

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Good morning
I think my question is very simple for your experience
one combobox with specific path give me the folders that have in it
I want when i select one folder from combobox the files in the folder placed in the list box.

What I have tried:

C#

private void Form1_Load(object sender, EventArgs e)
{
    DirectoryInfo obj = new DirectoryInfo(@"C:\");
    DirectoryInfo[] folders = obj.GetDirectories();
    comboBox1.DataSource = folders;            
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    // ???     
}

Posted 4-Aug-20 21:31pm

Stm21

Updated 4-Aug-20 22:26pm

TheRealSteveJudge

v4

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Comments

BillWoodruff 5-Aug-20 8:20am

You may have what you need, now, however, I'd like to suggest you use a TreeView to represent the possibly nested directory structures. If you want to see some code for that: just ask.

TheRealSteveJudge 5-Aug-20 8:54am

This is a brilliant idea!

3 solutions

Solution 3

See Path.GetFileName Method (System.IO) | Microsoft Docs[^].

Posted 4-Aug-20 22:26pm

Richard MacCutchan

Comments

BillWoodruff 5-Aug-20 8:16am

+5 unwarranted down-vote countered.

Richard MacCutchan 5-Aug-20 11:15am

Thanks Bill.

Solution 1

Code in combobox selected change would be roughly:

C#

String[] files = System.IO.Directory.GetFiles("combobox selected path of folder");
for (i = 0; i < files.Length; i++)
{
    listBox1.Items.Add(files[i]);
}

try out!

Reference Updated: Directory.GetFiles Method (System.IO) | Microsoft Docs[^]

Posted 4-Aug-20 21:44pm

Sandeep Mewara

Updated 8-Aug-20 6:41am

v2

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TheRealSteveJudge · Accepted Answer · 2020-08-04T21:52:00

Solution 2

First of all you must cast "sender" which is just an object
to "ComboBox".
Then you must get "SelectedValue".
Finally you must get the files that are in the selected directory and use it as data source for the ListBox.

C#

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    var comboBox = (ComboBox) sender;

    var directoryInfo = comboBox.SelectedValue as DirectoryInfo;

    if(directoryInfo == null) return;

    var filenames = Directory.GetFiles(directoryInfo.FullName);

    listBox1.DataSource = filenames;

    var shortFilenames = filenames.Select(x => Path.GetFileName(x)).ToList();

    listBox1.DataSource = shortFilenames;
}

Posted 4-Aug-20 21:52pm

TheRealSteveJudge

Updated 4-Aug-20 22:32pm

v4

Comments

Stm21 5-Aug-20 4:20am

Thank you for the quick response
the code work but in the list box the results is c:\bla bla bla...
i want only the filename not all the path

TheRealSteveJudge 5-Aug-20 4:33am

Please have a look at the updated solution.

Stm21 5-Aug-20 4:34am

Thank you so so so so so much for your help.

TheRealSteveJudge 5-Aug-20 4:35am

You're welcome!

BillWoodruff 5-Aug-20 8:21am

+5

TheRealSteveJudge 5-Aug-20 8:50am

Thank you, Bill!