[IronPython] Hosting IronPython in Silverlight - background loading

[Jimmy Schementi]

True, but according to his exception stack it never gets there ... it throws
on the "runtime = DynamicEngine.CreateRuntime(true);" line. It throws
because somewhere in that method it doesn't dispatch to the UI thread as you
described. Those are the fixes I need to do.

~Jimmy


2010/8/17 Dave Curylo <curylod at asme.org>

> Lukas,
>
> I think the problem is the RunWorkerCompleted handler trying to update the
> UI. Wrap calls from a background thread to update UI controls in something
> like this so the Dispatcher updates any controls on the UI thread:
>
> this.Dispatcher.BeginInvoke(() =>
>     {
>         this.textBlock1.Text = "IronPython loaded";
>     });
>
> Hope that helps.
>
> -Dave
>
> 2010/8/17 Lukas Cenovsky <cenovsky at bakalari.cz>
>
>   Hi all,
>> is it possible to load IronPython engine in the background thread in
>> Silverlight?
>>
>> I tried to load it via BackgroundWorker:
>>
>> private void UserControl_Loaded(object sender, RoutedEventArgs ev)
>> {
>>    IPloader = new BackgroundWorker();
>>    IPloader.DoWork += new DoWorkEventHandler((s, e) =>
>>        {
>>            runtime = DynamicEngine.CreateRuntime(true); // debug mode true
>>            engine = runtime.GetEngine("python");
>>        }
>>    );
>>    IPloader.RunWorkerCompleted += new RunWorkerCompletedEventHandler((s,
>> e) =>
>>    {
>>        this.textBlock1.Text = "IronPython loaded";
>>    }
>>    );
>>    IPloader.RunWorkerAsync();
>> }
>>
>> It fails with the following exception:
>>
>> System.UnauthorizedAccessException was unhandled by user code
>>  Message=Invalid cross-thread access.
>>  StackTrace:
>>       at MS.Internal.XcpImports.CheckThread()
>>       at
>> System.Windows.DependencyObject.GetValueInternal(DependencyProperty dp)
>>       at System.Windows.Deployment.get_Parts()
>>       at
>> Microsoft.Scripting.Silverlight.DynamicAppManifest.AssemblyParts()
>>       at Microsoft.Scripting.Silverlight.DynamicAppManifest..ctor()
>>       at Microsoft.Scripting.Silverlight.DynamicEngine.CreateLangConfig()
>>       at
>> Microsoft.Scripting.Silverlight.DynamicEngine.CreateRuntimeSetup(Boolean
>> debugMode)
>>       at
>> Microsoft.Scripting.Silverlight.DynamicEngine.CreateRuntime(Boolean
>> debugMode)
>>       at SLHosting.MainPage.<UserControl_Loaded>b__0(Object s,
>> DoWorkEventArgs e)
>>       at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs
>> e)
>>       at System.ComponentModel.BackgroundWorker.OnRun(Object argument)
>>  InnerException:
>>
>> Thanks for any advice.
>>
>> --
>> -- Lukáš
>>
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>>
>
>
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