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how to get value returned from ThreeState Property?

Question

In DataGridView I have 1 DataGridViewCheckBoxColumn,set ThreeState=true. I want when tick into CheckBox,for one status it will export an any value in TextBox

private void grd_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if ((grd.CurrentCell is DataGridViewCheckBoxCell) && (!grd.CurrentCell.Value.Equals(CheckState.Checked)))
            {
                     textBox1.Text = "true value";
            }
            if ((grd.CurrentCell is DataGridViewCheckBoxCell) && (!grd.CurrentCell.Value.Equals(CheckState.Unchecked)))
            {
                    textBox1.Text = "fasle value";
            }
            if ((grd.CurrentCell is DataGridViewCheckBoxCell) && (!grd.CurrentCell.Value.Equals(CheckState.Indeterminate)))
            {
              
                textBox1.Text = "indeterminate value";
            }
        }

when I debug program, its only export the last value "indeterminate value".please show me how to set status Check,Uncheck,Indeterminate is right?

binhnt

Wednesday, March 24, 2010 10:19 AM

Answers

You have a bug in your code:

if ((grd.CurrentCell is DataGridViewCheckBoxCell) && (!grd.CurrentCell.Value.Equals(CheckState.Indeterminate)))

This is going to set the text to "indeterminate value" any time the current cell value does not equal CheckState.Indeterminate.  I think you need to remove all three ! in your second condition.

However, I would also recommend rewriting this routine as:

private void grd_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    DataGridViewCheckBoxCell box = grd.CurrentCell as DataGridViewCheckBoxCell;

    if (box != null)
    {
          CheckState value = (CheckState)box.Value;
          switch(value)
          {
              case CheckState.Checked:
                  textBox1.Text = "true value";
                  break;
              case CheckState.Unchecked:
                  textBox1.Text = "false value";
                  break;
              default:
                  textBox1.Text = "indeterminate value";
                  break;
          }
    }
}

This, in my opinion, is less error prone and easier to follow.

Reed Copsey, Jr. - http://reedcopsey.com

Proposed as answer by CiaranODonnell Wednesday, March 24, 2010 5:43 PM
Marked as answer by Figo Fei Monday, March 29, 2010 6:50 AM

Wednesday, March 24, 2010 5:20 PM

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how to get value returned from ThreeState Property?

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