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  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 398
  • Last Modified:

Stopping Repeating Text In ListBox - C#

Hey guys,

In my program I have code to refresh the form every 20 seconds or so to see if values have been updated, this works fine.   The problem comes from a message it is to post into a listbox.  Every 20 seconds it goes through this 'loop' and posts the same message.   I know that it is because I havent got any code to tell it not to.

namespace TimerTesting
{
    public partial class frmMain:Form
    {
        Timer _RefreshFormTimer = new Timer();

        public frmMain()
        {
            InitializeComponent();
            _RefreshFormTimer.Interval = 1000 * 10;
            _RefreshFormTimer.Tick += new EventHandler(RefreshFormTimer_Tick);
            _RefreshFormTimer.Enabled = true;

        }

        private void frmMain_Load(object sender, EventArgs e)
        {

        }

               private void RefreshFormTimer_Tick(object sender, EventArgs e)
        {
            GetUpdatedResults();
        }
 
        public void GetUpdatedResults();
        {
             textBox1.Text = "2";
             listBox.Items.Insert(0, "The number is 2");
       }
  }
}

Is there a way that I can stop it from posting the same message if it is already present within the listbox?  If so what code should I use?
0
angus_young_acdc
Asked:
angus_young_acdc
  • 3
1 Solution
 
ozymandiasCommented:
You can check the items in the listbox to see if it is there and only insert it if it's not, or just clear the listbox before you add it.

<pseudocode>
bool found = false;
foreach(object o in listbox.Items){
    if (o.ToString() == "The number is 2"){
        found = true;
        break;
    }
}
if (!found){
     listBox.Items.Insert(0, "The number is 2");
}
</pseudocode>
0
 
REA_ANDREWCommented:
OR...

        public void GetUpdatedResults();
        {
             textBox1.Text = "2";
             listBox.Items.Clear();
             listBox.Items.Insert(0, "The number is 2");
       }

This simply clears the items first and then adds it
0
 
angus_young_acdcAuthor Commented:
Cheers guys.  I did consider clearing the text box, but that would have caused more hassle than it was worth as I need to keep certain records in it.
0
 
REA_ANDREWCommented:
I am not clearing the text box, I am clearing the ListBox
0
 
REA_ANDREWCommented:
I see what you mean lol
0

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