C# search in a textfile words to a listbox

Question

I have an ASP.NET ListBox that displays a list of activites taken from a text file. Now what I want to do is to search words, for example "hockey", entered by the user in a TextBox control, and display in the ListBox only the activities containing that search string.

score 2 · Answer 1 · answered Apr 15 '12 at 20:00

2

The question is vague enough, but considering information got from the post, I would say follow this pattern (a pseudocode):

using (StreamReader sr = new StreamReader(filepath)) 
 {

       while (sr.Peek() >= 0) 
       {
           string fileLine = sr.ReadLine();
           if(fileLine .Contains("hockey"))
                 DisplayInListBox(fileLine );
       }
}

Something like this.

answered Apr 15 '12 at 20:00

Tigran

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1

Looks like he already read data from a file since already bound it to a ListBox. Also code which mixed togethe file read operations an UI update looks not quite good from my point of view, why just not separate low-leve file-read functionality from UI stuff? – sll Apr 15 '12 at 20:08
@sll: to be honest, not very clear.. cause in both cases he talks about `activites` – Tigran Apr 15 '12 at 20:12

score 0 · Answer 2 · answered Apr 15 '12 at 20:56

pretty trivial I guess:

var items = //listBox1.Items;
private void textBox1_TextChanged(object sender, EventArgs e)
{
    listBox1.Items.Clear();

    foreach (object s in items)
    {
        if (s.ToString().Contains("hockey"))
            listBox1.Items.Add(s);
    }

    if (listBox1.Items.Count > 0)
        listBox1.SelectedIndex = 0;
}

The basic idea is to cache listbox's initial items, and clear it and then fill according to string typed in textbox.

C# search in a textfile words to a listbox

2 Answers2