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Pattern for doing parallel work off UI thread. #2

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4 changes: 4 additions & 0 deletions DigitDisplay/DigitDisplay.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,9 @@
<Reference Include="System.Configuration" />
<Reference Include="System.Data" />
<Reference Include="System.Drawing" />
<Reference Include="System.ValueTuple, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
<HintPath>..\packages\System.ValueTuple.4.4.0\lib\netstandard1.0\System.ValueTuple.dll</HintPath>
</Reference>
<Reference Include="System.Xml" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Core" />
Expand Down Expand Up @@ -103,6 +106,7 @@
<Generator>ResXFileCodeGenerator</Generator>
<LastGenOutput>Resources.Designer.cs</LastGenOutput>
</EmbeddedResource>
<None Include="packages.config" />
<None Include="Properties\Settings.settings">
<Generator>SettingsSingleFileGenerator</Generator>
<LastGenOutput>Settings.Designer.cs</LastGenOutput>
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37 changes: 10 additions & 27 deletions DigitDisplay/ParallelRecognizerControl.xaml.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,11 +35,11 @@ public ParallelRecognizerControl(string classifierName, FSharpFunc<int[], string
Loaded += RecognizerControl_Loaded;
}

private void RecognizerControl_Loaded(object sender, RoutedEventArgs e)
private async void RecognizerControl_Loaded(object sender, RoutedEventArgs e)
{

ClassifierText.Text = classifierName;
PopulatePanel(rawData);
await PopulatePanelAsync(rawData);
}

private struct PredictionData
Expand All @@ -49,39 +49,22 @@ private struct PredictionData
public string imageData;
}

private void PopulatePanel(string[] rawData)
private async Task PopulatePanelAsync(string[] rawData)
{
startTime = DateTime.Now;

var options = new ParallelOptions();
options.TaskScheduler = TaskScheduler.FromCurrentSynchronizationContext();
IProgress<(string prediction, string actual, string imageData)> progress = new Progress<(string prediction, string actual, string imageData)>(args =>
{
CreateUIElements(args.prediction, args.actual, args.imageData, DigitsBox);
});

var loopResult = Parallel.ForEach(rawData, s =>
var loopResult = await Task.Run(() => Parallel.ForEach(rawData, s =>
{
int act = s.Split(',').Select(x => Convert.ToInt32(x)).First();
int[] ints = s.Split(',').Select(x => Convert.ToInt32(x)).Skip(1).ToArray();
var result = Recognizer.predict<string>(ints, classifier);

//predictions.Enqueue(new PredictionData() {
// prediction = result, actual = act.ToString(), imageData = s });

Task.Factory.StartNew(() =>
CreateUIElements(result, act.ToString(), s, DigitsBox),
CancellationToken.None,
TaskCreationOptions.None,
options.TaskScheduler
);
});

//Parallel.Invoke(options, () =>
//{
// PredictionData d;
// while (predictions.TryDequeue(out d))
// {
// if (d.imageData != null)
// CreateUIElements(d.prediction, d.actual, d.imageData, DigitsBox);
// }
//});
progress.Report((result, act.ToString(), s));
}));
}

private void CreateUIElements(string prediction, string actual, string imageData,
Expand Down
4 changes: 4 additions & 0 deletions DigitDisplay/packages.config
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="System.ValueTuple" version="4.4.0" targetFramework="net45" />
</packages>