Vista - statusbar textblock update in long running operation

I have a status bar on my window that contains a TextBlock. I am trying
to update the text in the textblock during a long operation that's
running inside a button click handler on the same window. The text
doesn't update until the end, which is not what I want. I've tried
several combinations of InvalidateArrange(), InvalidateVisual() and
UpdateLayout() on both the TextBlock and it's parent StatusBar without
success. How can I do this?

Thanks,
Scott

It needs to be on a different thread - best way is probably to spawn a new
thread on button click. Plenty of examples around.

"Scott Walters" <scottw512@hotmail.com> wrote in message
news:O1CkIyUzHHA.3400@TK2MSFTNGP03.phx.gbl...
>I have a status bar on my window that contains a TextBlock. I am trying to
>update the text in the textblock during a long operation that's running
>inside a button click handler on the same window. The text doesn't update
>until the end, which is not what I want. I've tried several combinations of
>InvalidateArrange(), InvalidateVisual() and UpdateLayout() on both the
>TextBlock and it's parent StatusBar without success. How can I do this?
>
> Thanks,
> Scott

Are you saying the long running operation should run in a second thread
with a sync context so it can update the status bar ui on it's thread?

If there's no other way, I guess that's what I have to do...but it seems
like I should be able to call into the framework from the UI thread and
tell it to refresh/repaint the status bar contents.

Radek Cerny wrote:
> It needs to be on a different thread - best way is probably to spawn a new
> thread on button click. Plenty of examples around.
>
> "Scott Walters" <scottw512@hotmail.com> wrote in message
> news:O1CkIyUzHHA.3400@TK2MSFTNGP03.phx.gbl...
>> I have a status bar on my window that contains a TextBlock. I am trying to
>> update the text in the textblock during a long operation that's running
>> inside a button click handler on the same window. The text doesn't update
>> until the end, which is not what I want. I've tried several combinations of
>> InvalidateArrange(), InvalidateVisual() and UpdateLayout() on both the
>> TextBlock and it's parent StatusBar without success. How can I do this?
>>
>> Thanks,
>> Scott
>
>

Its actually internally very complex, but externally simple, and the simple
answer is no. If the UI thread is busy, nothing will redraw.

"Scott Walters" <scottw512@hotmail.com> wrote in message
news:OOb$oA4zHHA.5160@TK2MSFTNGP05.phx.gbl...
> Are you saying the long running operation should run in a second thread
> with a sync context so it can update the status bar ui on it's thread?
>
> If there's no other way, I guess that's what I have to do...but it seems
> like I should be able to call into the framework from the UI thread and
> tell it to refresh/repaint the status bar contents.
>
> Radek Cerny wrote:
>> It needs to be on a different thread - best way is probably to spawn a
>> new thread on button click. Plenty of examples around.
>>
>> "Scott Walters" <scottw512@hotmail.com> wrote in message
>> news:O1CkIyUzHHA.3400@TK2MSFTNGP03.phx.gbl...
>>> I have a status bar on my window that contains a TextBlock. I am trying
>>> to update the text in the textblock during a long operation that's
>>> running inside a button click handler on the same window. The text
>>> doesn't update until the end, which is not what I want. I've tried
>>> several combinations of InvalidateArrange(), InvalidateVisual() and
>>> UpdateLayout() on both the TextBlock and it's parent StatusBar without
>>> success. How can I do this?
>>>
>>> Thanks,
>>> Scott
>>