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alfrye
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Serialize diagramitemcollection to JSON
Jun 30th, 2010 at 4:33pm
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We have implemented our own copy selected items routine that save the selected items to a diagramitemcollection. I am trying to serialize the diagramitemcollection to a JSON  to put on the windows clipboard and then deserialize the JSON string from the clipboard back into a diagramitemcollection.


I am able to get the diagramitemcollection to serialize but I am unable to get the json string to deserialize back to the object.

any ideas !!

Alan
  
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Stoyo
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Re: Serialize diagramitemcollection to JSON
Reply #1 - Jun 30th, 2010 at 4:47pm
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Hi,

Is there any reason not to use the CopyToClipboard and PasteFromClipboard methods?

Stoyan
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #2 - Jun 30th, 2010 at 6:51pm
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We do custom validation of the items that are selected from the diagram to ensure everything that is needed is copied.
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #3 - Jun 30th, 2010 at 6:58pm
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Also when using the diagram.CopytoClipbord I am getting stackoverflow error.
  
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Re: Serialize diagramitemcollection to JSON
Reply #4 - Jun 30th, 2010 at 7:38pm
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What method is shown at the top of the stack?
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #5 - Jun 30th, 2010 at 8:04pm
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>System.dll!System.ComponentModel.ReflectPropertyDescriptor.ShouldSerializeValue
(object component = {System.Windows.Controls.Image}) + 0x99 bytes
  
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Re: Serialize diagramitemcollection to JSON
Reply #6 - Jun 30th, 2010 at 9:53pm
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Is this image hosted inside a DiagramNodeAdapter, or it's a part of a user control? I suppose you might get such exception if there are circular references between hosted user controls; in such case try handling the SerializeControl event to implement your own serialization.

As for JSON serialization - are you using the .NET's JavaScriptSerializer, or custom serialization code?
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #7 - Jun 30th, 2010 at 9:57pm
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I am using JSON.NET for my JSON serializer
  
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Re: Serialize diagramitemcollection to JSON
Reply #8 - Jul 1st, 2010 at 2:57pm
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Is this the library you are using?
http://json.codeplex.com/releases/view/43775

Could you copy here your serialization and deserialization code?
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #9 - Jul 1st, 2010 at 3:19pm
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Yes that is the library I am using.

Here is serialization and deserialization code.

Code
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public void copyItemsToSerialize(DiagramItemCollection itemsCopied)
{
    JsonSerializerSettings jss = new      JsonSerializerSettings{ ReferenceLoopHandling=ReferenceLoopHandling.Ignore};
            string jsonString =   JsonConvert.SerializeObject(itemsCopied,Newtonsoft.Json.Formatting.Indented, jss);
}


Code
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      public DiagramItemCollection getItems()
             {
                 DiagramItemCollection items;
                 JsonSerializerSettings jss = new JsonSerializerSettings {  ReferenceLoopHandling = ReferenceLoopHandling.Ignore };
                 string clpData = Clipboard.GetData(DataFormats.StringFormat) as String;
                 items = JsonConvert.DeserializeObject<DiagramItemCollection>(clpData, jss);
              return items;

             }


  
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Re: Serialize diagramitemcollection to JSON
Reply #10 - Jul 2nd, 2010 at 8:42am
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What versions of Json.NET and WpfDiagram are you using? I can't get even SerializeObject to work, it throws a "property Parent already exists" exception. I've added an Error handler to the settings to ignore the error, but then SerializeObject returns an empty Json string "[]" ...
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #11 - Jul 2nd, 2010 at 12:00pm
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I am using Mindfusion.Diagramming.wpf.dll 2.2.0.2560p and json.net 3.5.0.

When you serialize are using using JSON.convert or the jsonserializer class.  Also what object are you trying to serialize.


  
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Re: Serialize diagramitemcollection to JSON
Reply #12 - Jul 2nd, 2010 at 1:22pm
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I'm using v2.3.3 of the diagram control, and SerializeObject in the code below does not work. I will try this with v2.2 next week.

Code
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public void copyItemsToSerialize(DiagramItemCollection itemsCopied)
{
	var jss = new JsonSerializerSettings
	{
		Error = OnJsonError,
		ReferenceLoopHandling = ReferenceLoopHandling.Ignore
	};
	string jsonString = JsonConvert.SerializeObject(itemsCopied, Newtonsoft.Json.Formatting.Indented, jss);
	var items = JsonConvert.DeserializeObject<DiagramItemCollection>(jsonString, jss);
	Debug.WriteLine(items.Count);
}

private void OnJsonError(object sender, ErrorEventArgs e)
{
	e.ErrorContext.Handled = true;
}

private void OnClipboardJson(object sender, RoutedEventArgs e)
{
	copyItemsToSerialize(diagram.Selection.Items);
}
  
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alfrye
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Re: Serialize diagramitemcollection to JSON
Reply #13 - Jul 2nd, 2010 at 1:45pm
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In your example is jsonString empty.
  
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Re: Serialize diagramitemcollection to JSON
Reply #14 - Jul 2nd, 2010 at 2:33pm
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It returns "[]", and there are several items in the collection - the OnError handler is called for each of them.
  
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