graphic multithreaded WPF error

When I create 2 wires that respectively show 2 graphics, an error occurs.

When I commented "_controlDispatcher1.BeginInvoke (aps1 [f], simulatedData)", no error occurs.

code in MainWindow.xaml.cs line: 320

complete code to testmultithread.zip

I was able to reproduce the problem with your test project and create a task to solve this problem for the next version.

The underlying problem is with the cache that allows us to record textures point when rendering with bitmaps. From your application, the simple workaround solutions as "using vector rendering" and "do not use item renderers" do not seem to appropriate. However, using pre-initialized converters shared, you can avoid the cache access exception and always use the point rendering. Here are the changes I have made to your project to get this working:

(1) PointGraphicsReal.xaml

Remove the section, where the point local renderers are created.

(2) PointGraphicsReal.xaml.cs

Declare a static collection of converters point to share between all the graphs and use them as the default value for the PointGraphicsReal graph:

private static readonly SolidColorBrush[] _pointFills = new[]{
        Brushes.Red,
        Brushes.Lime,
        Brushes.Blue,
        Brushes.Yellow,
        Brushes.Magenta,
        Brushes.Cyan,
        Brushes.Red,
        Brushes.Lime,
        Brushes.White,
        Brushes.Lime,
        Brushes.Red,
        Brushes.Yellow,
        Brushes.Blue,
        Brushes.Cyan,
        Brushes.Magenta,
        Brushes.Lime,
        Brushes.Red,
        Brushes.White,
    };

public static readonly PlotRendererCollection PointRenderers = new PlotRendererCollection(
        _pointFills.Select( fill => {
            var pointRenderer = new PointPlotRenderer { Shape = PointShape.Ellipse, Fill = fill, Stroke = null };
            // Freeze the renderer so that it can be used on any thread.
            pointRenderer.Freeze( );
            return pointRenderer;
        } )
    );

public PointGraphicsReal( ) {
        InitializeComponent( );

graph.DefaultPlotRenderers.AddRange( PointRenderers );

// ...
    }

(3) MainWindow.xaml.cs

Initialize the converters point shared on the main UI thread, before they are used on all other threads, but their use in a hidden graph.

public MainWindow( ) {
        new NationalInstruments.Controls.Primitives.Tables.RenderTargetBitmapWrapper( 1.0, 1.0 );
        InitializeComponent( );

// Use all of the the shared renderers on one thread, to pre-cache the render settings for safe use on all threads.
        var graph = new Graph( );
        graph.Visibility = Visibility.Hidden;
        graph.RenderMode = RenderMode.Hardware;
        graph.DefaultPlotRenderers.AddRange( PointGraphicsReal.PointRenderers );
        graph.Data.AddRange( Enumerable.Repeat( (object)default( Point ), graph.DefaultPlotRenderers.Count ) );
        var panel = (Panel)this.Content;
        panel.Children.Add( graph );
    }

Tags: NI Software

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