Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>This is standard behavior for any Windows GUI application, screen updates don't happen until the UI thread goes idle so that Windows can deliver the Paint event. One of the absolute worst things you could do is calling Application.DoEvents(). Yes, that will deliver the Paint event. But it also allows your user to close the form. That produces a Big Kaboom when the control you are trying to update is suddenly not there anymore. Your loop is still running, but the form isn't there anymore.</p> <p>What you must have noticed is that the progress bar actually updated but the CheckedListBox did not. That's because ProgressBar often is used to show progress when the code is in a loop, so it makes sure that when you change the Value property, it immediately paints itself without waiting for Windows to tell it that it needs to be repainted. Dirty trick, very confusing.</p> <p>But you can take advantage of that trick as well, it is easy. Modify your code like this:</p> <pre><code>for (int i = 0; i &lt; 10; i++) { SOME_FUNCTION(); progressBar.Value++; checkListBoxItems.SetItemCheckState(i, CheckState.Checked); checkListBoxItems.Update(); } </code></pre> <p>The Update() method means "paint yourself when necessary". It is, you changed the check state of an item. Never does the Big Kaboom thingy on you, the user can't suddenly make the control disappear.</p> <p>If SOME_FUNCTION() takes a long time, like more than 10 x 0.3 seconds or so, then you should start thinking about using threads.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to update check boxes in a .NET checkListBox?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USHans Passant
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow to update check boxes in a .NET checkListBox?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThank you very much for this informative response. I actually just put Application.DoEvents() into my code yesterday because it worked. Thank you for telling me why it was a bad idea and a better alternative.
      singulars
      1. PO
      1. USKyle Van Koevering
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload