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"Refresh" method does not refresh
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Dom
Nov 8, 2012, 1:12:20 PM11/8/12
to
A program I have contains a Listview that keeps track of different
stages in the program. For example, a line in the listview may
indicate "starting to read the database", or "producing averages".
The method used to write these lines ends with:
lstview1.Refresh();
this.Refresh();
The second line seems like overkill to me, but I added it because the
first line did not work alone. In fact, the two lines together don't
work either. This confuses the users, who think the program is stuck.
How do I refresh things?
Dom
stages in the program. For example, a line in the listview may
indicate "starting to read the database", or "producing averages".
The method used to write these lines ends with:
lstview1.Refresh();
this.Refresh();
The second line seems like overkill to me, but I added it because the
first line did not work alone. In fact, the two lines together don't
work either. This confuses the users, who think the program is stuck.
How do I refresh things?
Dom
Jeff Johnson
Nov 8, 2012, 5:19:47 PM11/8/12
to
"Dom" <doliv...@gmail.com> wrote in message
news:dfe2065a-1968-4152...@c17g2000yqe.googlegroups.com...
Is the code that's processing the data running on the main thread? If so,
and it's a long-running process, that's probably the issue. Put that code in
a separate thread. You'll have to do a little bit of extra coding to update
the UI, since updates can only be performed by code on the main UI thread,
but there are a zillion examples of doing this on the 'Net. Just search for
".net update main ui from other thread invoke" and you should get more hits
than you can eat.
news:dfe2065a-1968-4152...@c17g2000yqe.googlegroups.com...
and it's a long-running process, that's probably the issue. Put that code in
a separate thread. You'll have to do a little bit of extra coding to update
the UI, since updates can only be performed by code on the main UI thread,
but there are a zillion examples of doing this on the 'Net. Just search for
".net update main ui from other thread invoke" and you should get more hits
than you can eat.
Registered User
Nov 8, 2012, 7:12:08 PM11/8/12
to
INotifyPropertyChanged.
<http://msdn.microsoft.com/en-us/library/ms229614.aspx>
regards
A.G.
Dom
Nov 8, 2012, 8:53:04 PM11/8/12
to
Well,what I do is this ...
Open a DB connection
Process an SQL statement
Add item to list view and refresh
Process an SQL statement
Add item to list view and refresh
Etc.
Maybe what I should is ...
Open a DB connection
Process SQL statement
Close DB connection
Add item to list view and refresh
Open a DB connection, etc.
Would that change things?
Dom
Open a DB connection
Process an SQL statement
Add item to list view and refresh
Process an SQL statement
Add item to list view and refresh
Etc.
Maybe what I should is ...
Open a DB connection
Process SQL statement
Close DB connection
Add item to list view and refresh
Open a DB connection, etc.
Would that change things?
Dom
Dom
Nov 9, 2012, 9:49:48 AM11/9/12
to
Application.DoEvents(). I suppose there is some danger here of firing
off unintended mouse clicks, but that's the price you pay.
Dom
Jeff Johnson
Nov 13, 2012, 11:15:06 AM11/13/12
to
"Dom" <doliv...@gmail.com> wrote in message
news:98b12a8e-6e35-49e7...@h9g2000yqd.googlegroups.com...
to use DoEvents. I'd recommend you read up on it; it seems to be discouraged
in many circles.
Arne Vajhøj
Nov 19, 2012, 9:42:51 PM11/19/12
to
It is in most cases a poor workaround for a bad design.
Much better to fix the design.
Those interested in the juicy details can Google:
application doevents evil
Arne
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