CODEWITHSUNDEEP
c#winformslistbox
Bitz
Bitz

Reputation: 1148

Selecting listbox members with partially matching string

I am currently using this method to match exact strings and select the index of which it belongs in a Listbox:

private void searchbtn_Click(object sender, EventArgs e)
{
    string term  = searchbox.Text;
    int index = memlist.FindString(term);
    if (index != -1)
        memlist.SetSelected(index, true);
}

Would it be possible to have all partially matching strings selected? How would I have to go about doing that?

Upvotes: 1

Views: 491

Answers (1)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236188

You can use following code, which selects indexes of items, which start with your string, and then iterate over them and set items selected:

memlist.ClearSelected(); // clear previous selection
memlist.Items.Cast<object>()
       .Select((item, index) => new { Text = memlist.GetItemText(item), Index = index })
       .Where(x => x.Text.StartsWith(term, StringComparison.CurrentCultureIgnoreCase))
       .ToList()
       .ForEach(x => memlist.SetSelected(x.Index, true));

BTW Don't forget to set SelectMode of ListBox to multi select.

You can also select items in foreach loop:

var indexesToSelect = memlist.Items.Cast<object>()
      .Select((item, index) => new { Text = memlist.GetItemText(item), Index = index })
      .Where(x => x.Text.StartsWith(term, StringComparison.CurrentCultureIgnoreCase))
      .Select(x => x.Index);

foreach(int index in indexesToSelect)
     memlist.SetSelected(index, true);

Upvotes: 2

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