finding an Item in listbox

[tek1ket]

i have a listbox with Items in it, and also a textbox. i want when the user type something in textbox, at first the new Item should be checked with the available Items in listbox so i used this syntax
lstProject.Items.Contains(txtPrj.Text.ToString())
but it always returns Flase as a result.
so am i wrong about the syntax?

 

[HarleyQuinn]

The item in the listbox exactly[/] matches the string you're getting from the textbox?

HarleyQuinn
---------------------------------
You can hang outside in the sun all day tossing a ball around, or you can sit at your computer and do something that matters. - Eric Cartman

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[jmeckley]

this returns false because Items contains ListItems, not strings. something like this should work

var item = listProject.Items.FindByText(txtPrj.Text);
if(item != null)
{
   item.Selected = true;
}

this requires the text to be an exact match. otherwise the logic will look like this

foreach(var item in lstProject.Items)
{
   if(!item.Text.StartsWith(txtPrj.Text) continue;
   item.Selected = true;
   break;
}

Jason Meckley
Programmer
Specialty Bakers, Inc.

 

[HarleyQuinn]

Jason, While I agree with the theory, you can successfully check strings against the Items (which I thought was an ObjectCollection?) using Contains() (this is admittedly based on the Forms ListBox and tested in a version prior to 3.0, but neither is specified by the OP).

A rather long winded (and overly simplistic) example but:

ListBox listBox1 = new ListBox();

            listBox1.Size = new System.Drawing.Size(100, 100);
            listBox1.Location = new System.Drawing.Point(100, 100);

            this.Controls.Add(listBox1);

            listBox1.BeginUpdate();

            listBox1.Items.Add("I'm in there");

            listBox1.EndUpdate();

            TextBox TextTest = new TextBox();

            TextTest.Size = new System.Drawing.Size(100, 100);
            TextTest.Location = new System.Drawing.Point(100, 50);

            this.Controls.Add(TextTest);

            TextTest.Text = "I'm in there";

            if (listBox1.Items.Contains(TextTest.Text.ToString()) == true)
            {
                MessageBox.Show("'" + TextTest.Text.ToString() + "' was in there");
            }

            TextTest.Text = "I'm not";

            if (listBox1.Items.Contains(TextTest.Text.ToString()) == true)
            {
                MessageBox.Show("'" + TextTest.Text.ToString() + "' was in there on the second run");
            }
            else
            {
                MessageBox.Show("But '" + TextTest.Text.ToString() + "' wasn't in there");
            }

HarleyQuinn
---------------------------------
You can hang outside in the sun all day tossing a ball around, or you can sit at your computer and do something that matters. - Eric Cartman

Get the most out of Tek-Tips, read FAQ222-2244: How to get the best answers before posting.

http://lessthandot.com

 

[tek1ket]

this one worked
lstProject.FindStringExact(txtPrj.Text.ToString());

thank you all