problem with checkbox to expect one

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Hi ,

I working with checkBox Days , if i checked all days checkbox -> all other days will be checked -> so my problem appears when i want to unchecked to other day -> the all days checkbox shold be changed to unchecked.

here's my code ... plz help to handle this case

C#

private void AllDays_CheckedChanged(object sender, EventArgs e)
{
    if (AllDays.CanFocus)
    {
        if (AllDays.CheckState == CheckState.Checked)
        {
            foreach (Control item in Controls)
            {
                if (item is CheckBox)
                {
                    (item as CheckBox).Checked = true;
                }
            }
        }
        else if (AllDays.CheckState == CheckState.Unchecked)
        {
            foreach (Control item in Controls)
            {
                if (item is CheckBox)
                {
                    (item as CheckBox).Checked = false;
                }
            }
        }
    }
}

Posted 27-Dec-11 3:31am

Honeyboy_20

Updated 27-Dec-11 3:33am

v2

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2 solutions

Solution 1

Try handling the individual days checked event:

C#

bool isAutoChange = false;
private Void IndividualDay_CheckedChanged(object sender, EventArgs e)
   {
   isAutoChange = true;
   
   AllDays.CheckState = CheckState.UnChecked;

   isAutoChange = false;
   }

Then check the isAutoChange in your AllDays handler and if set, do nothing at all.

The problem is that your AllDays event changes the state of the individual days, and the individual days change the state of AllDays - which causes All Days to fire the event, which...

You need to provide an "override" mechanism to prevent it.

Posted 27-Dec-11 3:48am

OriginalGriff

Comments

[no name] 27-Dec-11 10:10am

that looks good. And to be on the safe side maybe a try __finally. Anyway 5 from a cp noob.
Regards.

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Ahmed R El Bohoty · Accepted Answer · 2011-12-27T12:51:00

Here's the solution , I test it and it work good
- the problem is that :- all events fire without calling it so you need to use 'Focused' propriety to prevent code in event from firing.

bool checkChanged = false;

       private void AllDays_CheckedChanged(object sender, EventArgs e)
       {
           if (AllDays.Focused)
           {
               if (checkChanged == false)
               {
                   if (AllDays.CheckState == CheckState.Checked)
                   {
                       foreach (Control item in Controls)
                       {
                           if (item is CheckBox)
                           {
                               (item as CheckBox).Checked = true;
                           }
                       }
                   }
                   else if (AllDays.CheckState == CheckState.Unchecked)
                   {
                       foreach (Control item in Controls)
                       {
                           if (item is CheckBox)
                           {
                               (item as CheckBox).Checked = false;
                           }
                       }
                   }
               }
           }


       }

       private void Day4_CheckedChanged(object sender, EventArgs e)
       {
           CheckBox chk = sender as CheckBox;
           if (chk.Focused)
           {
               checkChanged = true;
               if (checkChanged == true)
               {
                   AllDays.CheckState = CheckState.Unchecked;
               }
               checkChanged = false;
           }
       }