CODEWITHSUNDEEP
c#listboxcompare
Carl_Honcho
Carl_Honcho

Reputation: 73

Compare string between listboxes

I have two listboxes with several data, ListBox1 have this format:

C:\Users\Charlie\Desktop\Trials\Trial0004COP.txt

and in my ListBox2:

Trial0004COP

How can I check if Trial0004COP exists in my listbox1? I used Contain() but it doesn't work.

Upvotes: 0

Views: 304

Answers (3)

Scott Earle
Scott Earle

Reputation: 680

I would recommend something like:

var searchString = "Trial0004COP";
var isFound = false;
foreach(var name in listbox1.items)
{
    if (Path.GetFileNameWithoutExtension(name).ToLower() == searchString.ToLower())
    {
        _IsFound = true;
        break;
    }
}

Note that in Windows, file names are case-preserving but not case-sensitive, so you need to check the file name ignoring its case.

You could do it in a single line in Linq, if that's your thing.

var searchString = "Trial0004COP";
var isFound = listBox1.Items.Cast<string>()
                            .Any(x => Path.GetFileNameWithoutExtension(x).ToLower() == searchString.ToLower());

Upvotes: 1

JamieSee
JamieSee

Reputation: 13020

Using LINQ you can do:

listBox1.Items.Select(e => Path.GetFileNameWithoutExtension(e as string)).Contains("Trial0004COP");

Upvotes: 0

Omar
Omar

Reputation: 16623

What about:

bool found = listBox1.Items.Cast<string>()
                           .Where(x => x.Contains("Trial0004COP"))
                           .Any();

Or to make it more accurate use String.EndsWith() method but you also have to add ".txt" if you want to make it works:

bool found = listBox1.Items.Cast<string>()
                           .Where(x => x.EndsWith("Trial0004COP.txt"))
                           .Any();

Edit :

Hi Fuex, I'm using OpenFileDialog to select a file, then this file is added to my listbox1 with all the Directory name. In my listbox2 I read another file that contains several Trials000""" and add them to it, I want to know if the file that I selected from the open dialog exist in my listboz2

Yes can do it in this way:

bool found = false;
if(openFileDialog.ShowDialog() == DialogResult.OK){
   found = listBox.Items.Cast<string>()
                        .Where(x => x.EndsWith(openFileDialog.FileName))
                        .Any();

   if(!found)
      MessageBox.Show(openFileDialog.FileName + " doesn't exist in listBox1"); //show a message
}

Upvotes: 0

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