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POHow to use a copy (or same) object in multiple threads
 

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  1. POHow to use a copy (or same) object in multiple threads
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    <p>I am trying to make a warning window in an application. The window needs to run on a seperate thread and contains among other things a Canvas depicting a failing object. The Canvas already exists in the main application, and what i need is simply to show the same Canvas in the warning window. The problem is that i get an error saying that another thread owns the object. I tried doing a deep copy using <a href="http://msdn.microsoft.com/en-us/library/system.windows.markup.xamlwriter.aspx" rel="nofollow">this</a> method but with no luck. Is there anything i missed, or is there really no simple method to copy a Canvas, or a collection of images. Alternatively, would it be possible to do the deep copy and then change the treading affinity of the copied object?</p> <p>I should think that someone has encountered this problem before, but my serching skills have given me no relevant results this time.</p> <p>Thanks in advance! -ruNury</p> <p>EDIT 1</p> <pre><code> private Canvas cloneCanvas() { Canvas testcanv = new Canvas(); Dispatcher.Invoke(new Action(delegate { var t = SomeViewModel.GetCanvasWithImages(); testcanv = CopyCanvas(t); })); return testcanv; } public static UIElement DeepCopy(UIElement element) { if (element != null) { var xaml = XamlWriter.Save(element); var xamlString = new StringReader(xaml); var xmlTextReader = new XmlTextReader(xamlString); var deepCopyObject = (UIElement)XamlReader.Load(xmlTextReader); return deepCopyObject; } return null; } private Canvas CopyCanvas(Canvas inputCanvas) { if (inputCanvas != null) { var outputCanvas = new Canvas(); foreach (UIElement child in inputCanvas.Children) { outputCanvas.Children.Add(DeepCopy(child)); } return outputCanvas; } return null; } </code></pre>
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    1. USruNury
    1. USruNury
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    1. COOnly the thread that created a UI object (main) can access the UI object.
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      1. POHow to use a copy (or same) object in multiple threads
      1. USpaparazzo
    2. COYes, that is the reason why I need a COPY of the object which can be shown on the NEW thread...
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      1. POHow to use a copy (or same) object in multiple threads
      1. USruNury
    3. COI feel your pain. I have tried to do this and gave up. It seems that even a copy of a UI object still a UI object. I know this seems extreme but you may needs to serialize to string and create the canvas. I even had to serialize a FlowDocument to string to pass it from background to the main.
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      1. POHow to use a copy (or same) object in multiple threads
      1. USpaparazzo
 

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