Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You need to reverse your code. </p> <p>The constructor of FormWithLotData is running in the UI thread. This is the thread that must show your FormIsLoading form. So instead of trying to display this form using the new Thread, do your data loading with it.</p> <p>The DoEvents way others have suggested is the easiest to implement and (possibly? never done it myself) may work well. </p> <p>The better pattern to use is to do your data loading on a worker thread. Before you show your FormWithLotData, Begin loading data on a background thread and show your Loading dialog. The method that loads the data should have a callback method into the Loading dialog to signal when it should Close(). Once it closes you can then construct a new FWLD, pass it the already loaded data, and Show it.</p> <p>Trying to load your data after the form has already been invoked mixes your UI with your data operations, forcing your form to not only be in charge of the UI but also be in charge of data retrieval. Bad for KISS and Single Responsibility, imho. </p> <hr> <p>After your update, it seems like DoEvents is going to be the only real answer to your question, but with some caveats.</p> <p>You will not be able to show another form MODALLY while you construct your tree. You will still have to do your heavy work within your form's constructor. You will still have to hide your main form and Show() (not ShowDialog) your loading form. You will also have to call DoEvents <em>at every single possible moment</em> while constructing your tree. Its not exactly an elegant solution, but it will probably be your best bet at this point.</p>
    singulars
    1. This table or related slice is empty.
    1. POWinforms: How to display a "loading" form?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USWill
    1. USWill
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWinforms: How to display a "loading" form?
      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. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. CO+1. Better idea than mine, and should address the GIF not being animated... It's more complicated to do, but not by much, and I think worth the effort.
      singulars
      1. PO
      1. USDavid
    2. COThe heavy loading in my case is building a large treeview. If I put this method in a thread then it can't access the treeview because the treeview is in another thread.
      singulars
      1. PO
      1. USMartijn
    3. CO@Martijn: You can invoke the event of that object on that thread. That is what you'll need to do if you want to update the GUI object.
      singulars
      1. PO
      1. USgalford13x
 

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