CODEWITHSUNDEEP
c#listbox
coder
coder

Reputation: 558

Read text files into multiple list boxes c#

I need my app to put different lines/data from a text file into different list boxes. Right now I've written code that load all the data/lines into one listbox: 

public void OnLoad
{
OpenFileDialog load = new OpenFileDialog();

            //load.InitialDirectory = "c:\\";
            load.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            load.FilterIndex = 2;
            load.RestoreDirectory = true;

            if (load.ShowDialog() == true)
            {
                try
                {
                        List<string> lines = new List<string>(); 
                        using (StreamReader stream = new StreamReader(load.OpenFile())) 
                        {
                            string line; 
                            while((line = stream.ReadLine()) != null)
                            {
                                lb1.Items.Add(line); 
                            }
                        }
                    }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
                }
            }
}

I want the different list boxes to contain the lines/data that starts with the same two letters as they do.

Any ideas?

Upvotes: 0

Views: 303

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460108

So you want to group by the first two letters? Presuming you need dynamic ListBoxes too:

var twoLetterGroups = File.ReadLines(load.FileName)
   .Where(l => l.Length >= 2)
   .GroupBy(l => l.Substring(0, 2), StringComparer.InvariantCultureIgnoreCase)
   .Select(g => new { FirstTwoLetters = g.Key, Lines = g.ToArray()})
   .ToArray();

ListBox[] listboxes = Enumerable.Range(0, twoLetterGroups.Length).Select(i => new ListBox()).ToArray();
for (int i = 0; i < twoLetterGroups.Length; i++)
{
    listboxes[i].Items.AddRange(twoLetterGroups[i].Lines);
}
// add listboxes to form

Upvotes: 1

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