Problem with SelectedIndexChanged

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Hi I have this code.

private void cmbIndex()
      {
          foreach (Control myControl in this.Controls)
          {
              ComboBox comboBox = myControl as ComboBox;
              if (comboBox != null && comboBox.Items.Count > 0)
              {
                  comboBox.SelectedIndex = 0;
              }
          }
      }

This selects all combo box index to zero. But I have one combo box with a selectedindexchanged event.
cmbIndex() does not fire anymore. Should I revise my codes for cmbIndex? Thank you

Posted 10-Sep-14 19:36pm

BeastMode10

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Comments

Sergey Alexandrovich Kryukov 11-Sep-14 1:57am

cmbIndex cannot be "fired". This is a method. And it may or may not be used as a handler. Check up your += operators...
—SA

Bernhard Hiller 11-Sep-14 2:12am

Is that a follow-up question to
http://www.codeproject.com/Questions/729061/selectedindexchanged-not-firing?arn=0
?
Or did you expect the SelectIndexChanged event to be fired when you set SelectedIndex=0 ?
Note the "Changed" part of the name - if the index was already 0, and you set it to 0 again, it is not changed, hence no event!

2 solutions

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Raul Iloc · Answer 1 · 2014-09-10T19:56:00

If I understood correctly you want tu use this method to init/reinit all your combo box controls that do not have yet index selected. For doing that you should change your method like this (because SelectedIndex with value -1 means no index selected):

C#

private void cmbIndex()
{
    foreach (Control myControl in this.Controls)
    {
        ComboBox comboBox = myControl as ComboBox;
        if (comboBox != null && comboBox.Items.Count > 0 && comboBox.SelectedIndex < 0)
        {
            comboBox.SelectedIndex = 0;
        }
    }
}

MuhammadUSman1 · Answer 2 · 2014-09-10T19:56:00

C#

//try this code.
private void cmbIndex()
        {
  foreach (Control c in this.Controls)
        {
            foreach (Control childc in c.Controls)
            {
                if (childc is ComboBox)
                {
                 ComboBox comboBox = childc as ComboBox;
                if (comboBox != null && comboBox.Items.Count > 0)
                {
                    comboBox.SelectedIndex = 0;
                }
                  // ((ComboBox)childc).SelectedIndex = 0;
                }
            }
        }
        }

if any issue then let me know.

-> M.U

Problem with SelectedIndexChanged

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Problem with SelectedIndexChanged

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