c# - BackgroundWorker OnWorkCompleted throws cross-thread exception -


I have a simple user control for database paging, which uses a controller to make a real DAL call. I use a BackgroundWorker to do the big task, and on the OnWorkCompleted event I re-enable some buttons, change a textbox.text Raise an event for property and parent form.

Form A keeps my user strings. When I click on a button that opens Form B, even if I do not do "there" and just close it, and from my database Trying to bring the next page, I call onWorkCompleted on the worker thread (and not my main thread), and throws an cross-thread exception.

At the moment I have added a check to the Codex on the handlebars, but the main code of the main code is called OnWorkCompleted ? Why would it not work as expected?

Edit:

I have been able to reduce the problem and the problem BackgroundWorker I have the following solution, which is called a command for the archmap , Which opens a simple form1 with two buttons.

The first button runs a BackgroundWorker that flows to 500 mms and updates a counter RunWorkerCompleted in the form it InvokeRequired , and updates the title to show that the method was originally going to run inside the main thread or worker thread. The second button just opens Form2 , which has nothing in it.

First of all, all calls to RunWorkerCompletedare are built inside the main thread (as expected - the whold point of RunWorkerComplete method, thats the least that what I BackgroundWorker )

After opening and closing Form2 , by understanding on the code, containing the Runverker always being called on the worker thread I want to add that I can skip this problem with this problem ( InvokeRequired for RunWorkerCompleted method Check it out), but I should understand why my expectations are against it. In my "real" code, I would always like to know that the Runaworker Compulsive method is being called on the main code.

I got this problem to pin form.Show (); In my BackgroundTesterBtn - If I use ShowDialog () instead, I can not find any problem ( RunWorkerCompleted always on the main thread Moves). I need to use the Show in my ArcMap project, so that the user will not be bound to the form.

I also tried to reproduce the bug on the usual WinForms project. I added a simple project that opens the first form without arcaxes, but in that case I could not reproduce the bug - the main code was running run worker compliant , even if I Shown () or ShowDialog () before and after Form2 . I tried to add a third form to work as a main form before my Form1 , but its results did not change.

is my simple SLN (VS2005 SP1) - it's

ESRI.ArcGIS.ADF (9.2.4.1420)

ESRI.ArcGIS.ArcMapUI (9.2.3.1380 )

ESRI.ArcGIS.SystemUI (9.2.3.1380)

This is a bug I suggest using bullet-proof: (i)

Code> if (control.InvokeRequired) control.Invoke (action); Else Action ()


Comments

Post a Comment

Popular posts from this blog

python - Overriding the save method in Django ModelForm -

I'm having trouble overriding a ModelForm save method. I get this error I'm: Exception type: TypeErier Exception Value: Save () found an unexpected keyword argument 'committed' My intentions include a form 3 fields Submit several values ​​for, then create an object for each combination of those areas, and to save each object file models.py class collarsult type (models.Model): id = model. AutoField (db_column = 'icontact_result_code_type_id', primary_key = true) callResult = models.ForeignKey ( 'CallResult', db_column = 'icontact_result_code_id') campaign = models.ForeignKey ( 'campaign', db_column = 'icampaign_id') CALLTYPE = models.ForeignKey ( 'CALLTYPE', db_column = 'icall_type_id') agent = models.BooleanField (db_column = 'bagent', default = true) teamLeader = models.BooleanField (db_column = 'bTeamLeader', default = true) active = models.BooleanField (db_column = Django.form...
Read more

html - CSS autoheight, but fit content to height of div -

I have a div in which there are three children- div in the left and middle div: float: left while true: float: true because it is my layout Actually will spoil, I've used ClearFix Hack: .cf {zoom: 1; }. Cf: First,. Cf: {content: ""; Display: Table; }. Cf: After {clear: both; } It still works, but I want to be the right div an indicator. So it should fill 100% of the parent unit of height. How can I complete this? PS is the full code: & Lt; / Div & gt; & Lt; Div class = "mobile_content" & gt; & Lt; H5 & gt; {{Data.titel}} & lt; / H5> & Lt; Table & gt; & Lt; TR & gt; & Lt; Th & gt; Komponist: & lt; / Th & gt; & Lt; TD & gt; {{Data.komponist}} & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; Th & gt; Instrument: & lt; / Th & gt; & Lt; TD & gt; {{Data.instrumente}} & lt; / TD & gt; & Lt; / TR & gt;...
Read more

qt - How to prevent QAudioInput from automatically boosting the master volume to 100%? -

I have been trying to use Qt5 multimedia to record audio with QAudioInput, however, when I see If QAudioInput is started, it increases the master volume of my sound device to 100%. How can I prevent QAudioInput from changing the master volume? My current development platform is Linux with PalsAdio (with flat audio disabled). How can I use QAudioInput : QAudioDeviceInfo device_info = QAudioDeviceInfo :: defaultInputDevice (); QAudio format format; Format.setSampleRate (44100); Format.setChannelCount (1); Format.setSampleSize (16); Format.setCodec ("Audio / PCM"); Format.setSampleType (QAudioFormat :: SignedInt); Format.setByteOrder (QAudioFormat :: LittleEndian); Std :: cout & lt; & Lt; Device_info.deviceName (). ToUtf8 (). ConstData () & lt; & Lt; Std :: endl; QAudioInput * default_device = new QAudioInput (device_info, format); QIODevice * default_io_device = default_device-> Start (); a QAudioInput.setVolume () method is not you I ...
Read more