Hi,
I'm writing a little application that scans a large number of media
files for processing.
The main application currently uses a backgroundworke rprocess to
perform the scan. Each media file has meta data extracted and is added
to one of a range of lists (pseudo-queues) for later processing. This
is all fine. But, I want to provide more feedback to the end user as to
progress as the process takes a considerable time.
To do so I have implemented a new modal dialog which outputs counts on
queues, and the current location in the filesystem that the scanning
has reached.
However, I have problems with this.
Firstly, I tried creating the new progress window in the main form
class, that then failed as when I tried to update the labels and
controls on the progress window I could not as the window was created
in another thread.
Then, I tried to create the progress window within the method that the
backgroundworke rprocess thread runs. This did not allow me to create a
modal dialog as I could not pass "this" into the constructor, because
the variable was not created in the same process.
I don't really want to move the logic into the progress window, because
I need to deal with the queues when populated.
This is just all seeming to be too much of a mess. Updating a progress
window is such a COMMON thing that applications do all the time. There
/must/ be a tried and tested pattern for doing so, I can't beleive that
..NET doesn't have a nice simple way to do this.
However, I've failed to find it so far. I'm new to .NET and winforms.
I've done some limited GUI programming in Delphi and a tiny bit in VB6,
I'm primarily an enterprise web application developer. i.e. I can code
well in the web paradigm, but my thick client gui stuff is almost
completely non-extant.
Any pointers to RTFM greatly accepted.
(Oh, .NET 2.0 in C# Express 2005)
Cheers,
Mike
2  3564 
RTFM.. ;-)
In your DoWork event handler, you'll have to use the
BackgroundWorke r.ReportProgres s method. DoWork should be adding to
the queues, and you UI should be handling the ProgressChanged event to
update the labels / progress bar.
HTH
Michael Jervis wrote:
Hi,
I'm writing a little application that scans a large number of media
files for processing.
The main application currently uses a backgroundworke rprocess to
perform the scan. Each media file has meta data extracted and is added
to one of a range of lists (pseudo-queues) for later processing. This
is all fine. But, I want to provide more feedback to the end user as to
progress as the process takes a considerable time.
To do so I have implemented a new modal dialog which outputs counts on
queues, and the current location in the filesystem that the scanning
has reached.
However, I have problems with this.
Firstly, I tried creating the new progress window in the main form
class, that then failed as when I tried to update the labels and
controls on the progress window I could not as the window was created
in another thread.
Then, I tried to create the progress window within the method that the
backgroundworke rprocess thread runs. This did not allow me to create a
modal dialog as I could not pass "this" into the constructor, because
the variable was not created in the same process.
I don't really want to move the logic into the progress window, because
I need to deal with the queues when populated.
This is just all seeming to be too much of a mess. Updating a progress
window is such a COMMON thing that applications do all the time. There
/must/ be a tried and tested pattern for doing so, I can't beleive that
.NET doesn't have a nice simple way to do this.
However, I've failed to find it so far. I'm new to .NET and winforms.
I've done some limited GUI programming in Delphi and a tiny bit in VB6,
I'm primarily an enterprise web application developer. i.e. I can code
well in the web paradigm, but my thick client gui stuff is almost
completely non-extant.
Any pointers to RTFM greatly accepted.
(Oh, .NET 2.0 in C# Express 2005)
Cheers,
Mike
Andy wrote:
RTFM.. ;-)
In your DoWork event handler, you'll have to use the
BackgroundWorke r.ReportProgres s method. DoWork should be adding to
the queues, and you UI should be handling the ProgressChanged event to
update the labels / progress bar.
I can't beleive I missed that...
Thanks a lot. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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