CODEWITHSUNDEEP
c#
DaveB
DaveB

Reputation: 51

Filtering Listbox by content from text file

Can someone explain why the following code it isn't filtering?

private void LoadAppointments()
{
    // load all "Routine" appointments into the listbox
    string[] lines = File.ReadAllLines(@"D:\appointments.txt");

    string filter = "Routine";

    // this part is not working. It isn't filtering by only showing 
    // "Routine" appointments in the listbox.
    if (lines.Contains(filter))
    {
        listAppts.Items.Add(lines);
    }

    listAppts.Items.AddRange(lines);  
    // if I leave this out, nothing gets loaded, but if I add this 
    // line, everything gets loaded without being filtered.
}

Upvotes: 0

Views: 38

Answers (2)

G. B.
G. B.

Reputation: 628

The problem is with this:

if (lines.Contains(filter))
{
    listAppts.Items.Add(lines);
}

The contains function returns true, if any of the lines matches, in its entirety, "Routine". What you really need is the list of lines where a substring of that line has "Routine". Eg.

List<string> res = lines.Where(x => x.Contains(filter)).ToList();
listAppts.Items.Addrange(res);

Upvotes: 2

gandalf
gandalf

Reputation: 470

    private void LoadAppointments()
{
    // load all "Routine" appointments into the listbox
    string[] lines = File.ReadAllLines(@"D:\appointments.txt");

    string filter = "Routine";

    var filteredLines = lines.Where(line => line.Contains(filter)).ToList();
}

Upvotes: 1

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