Separate files by filename to listbox

Question

5.00/5 (1 vote)

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Hello friends !!!!!

I have one folder with many txt files with filename 11111111111_a,11111111111_b,22222222_a,22222222_b
How can separate to 2 listboxes by last digit?

What I have tried:

C#

private void Form1_Load(object sender, EventArgs e)
{
	textBox1.Text = Form1.GetMACAddress();
	DirectoryInfo obj = new DirectoryInfo(@"C:\");
	DirectoryInfo[] folders = obj.GetDirectories();
	comboBox1.DataSource = folders;
}

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);
	var shortFilenames = filenames.Select(x => Path.GetFileName(x)).ToList();
	
	listBox1.DataSource = shortFilenames;
	listBox2.DataSource = shortFilenames;
}

Posted 6-Aug-20 23:56pm

Stm21

Updated 7-Aug-20 0:13am

TheRealSteveJudge

v2

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Comments

TheRealSteveJudge 7-Aug-20 6:04am

What do the file names really look like?
Don't they have a file type e.g. 11111111111_a.txt?

Stm21 7-Aug-20 6:10am

i have a machine that export log with this format not exactly 111111_a.txt
but the last 2 digits are always _a _b _c _e etc.

TheRealSteveJudge 7-Aug-20 6:18am

5* for asking an understandable question!

2 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2020-08-07T00:11:00

Solution 1

Something like this should work:

C#

var fileNames = directoryInfo.EnumerateFiles()
    .Select(f => f.Name)
    .ToLookup(f => Path.GetFileNameWithoutExtension(f).LastOrDefault());

listBox1.DataSource = fileNames['a'];
listBox2.DataSource = fileNames['b'];

Posted 7-Aug-20 0:11am

Richard Deeming

Comments

TheRealSteveJudge 7-Aug-20 6:15am

5* for the generic approach!

Stm21 7-Aug-20 6:17am

Thank you!!!!!!!!!!!!!

TheRealSteveJudge · Accepted Answer · 2020-08-07T00:13:00

If your filenames are like this
e.g. 11111111111_a.txt or 11111111111_b.txt
LINQ will help you.

C#

listBox1.DataSource = shortFilenames.Where(x => Path.GetFileNameWithoutExtension(x).EndsWith("a")).ToList();
listBox2.DataSource = shortFilenames.Where(x => Path.GetFileNameWithoutExtension(x).EndsWith("b")).ToList();

BTW It is recommended to assign more meaningful names to your user interface items.
e.g. listBox1 does not mean anything.

You could name the listBoxes e.g. listBoxLogA, listBoxLogB, listBoxLogC etc.

Separate files by filename to listbox

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Solution 2

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Separate files by filename to listbox

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