Going into an infinite loop

[Mark Allison]

Hi,

I'm a DBA learning C#, so am quite green.

I have a form http://www.markallison.co.uk/Images/squealfind2.jpg, on
the right there is a group of checkboxes with All Object Types as the
header.

Now, when I check All Object Types, all the other checkboxes take on the
chkAllObjectTypes check value. Great. What I want to happen is when one
of the other check boxes are checked, I want the chkAllObjectTypes
checkbox to change state to

1) Indeterminate (tristate) if all other checkboxes are not the same
2) Change to checked, if all other checkboxes are checked
3) Change to unchecked, if all other checkboxes are unchecked.

I've pretty much got 2 and 3 covered, I'm having a little trouble with
1. Code snapshot:
http://paste.mine.nu/Pastebin/Uploads/paste_01144674226.htm

Thanks.

--
Mark Allison, SQL Server MVP
http://www.markallison.co.uk

Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602m.html

 

[Justin Rogers]

You have loads of checks here. What you might want to do is think about
updating an integer or other value based on some bit ordinal... Something
like the following:

int allBits = 0;
allBits = (allBits << 1) + ((chkColumn.Checked) ? 1 : 0);
allBits = (allBits << 1) + ((chkColumn2.Checked) ? 1 : 0);

When you are done, you need to know how many bits you used. The
reason is you are going to & the value.. Above we added 2 bits, so we'll
use the value of 0x3 (11 in binary).

switch(allBits & 0x3) {
case 0x0:
chkAll.Checked = false;
break;
case 0x3:
chkAll.Checked = true;
break;
default:
chkAll.ThreeState = true; chkAll.CheckState = CheckState.Indeterminate;
break;
}

I'm not testing the above code, so there may be some fixes you need to make, but
the concept is solid enough for you to change your program appropriately...