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Error after LoadfromXML for Custom Shape node (Read 3996 times)

tusharpateluk YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 37 Joined: Sep 3^rd, 2008	Error after LoadfromXML for Custom Shape node Oct 1^st, 2008 at 12:47pm	Print Post
	Hi, I have extended Shape node with some additional data. Saving diagram to XML works fine. While load the save xml file it throws me error "Object reference not set to an instance of an object". I had override LoadFromXML and was getting this error after LoadFromXML was successfully completed. After further research, I found that error was coming from Draw method that was executing after the LoadFromXML. Can anyone please help me to fix this error. What exactly should I write in Draw method to fix this issue. Or their is any other solution. Below is the stack trace of the error. Looking forward to your reply. at MindFusion.Text.Layout.x8a1888a014534b73(Int32 xb1c30745a1525188) at MindFusion.Text.Layout.Draw(Double xOff, Double yOff, RenderTextCallback renderCallback, DrawTextHint hint) at MindFusion.Diagramming.Wpf.ShapeNode.xeda13f64d938197c(DrawingContext x41347a961b838962, RenderOptions xdfde339da46db651) at MindFusion.Diagramming.Wpf.ShapeNode.xc79d59e9288101bd(DrawingContext x41347a961b838962, Rect xa6236fc5cd405c4e, Boolean x2f9dabff87b2168b, Brush xb45de92d01a0ec1f, Pen x9c79b5ad7b769b12, RenderOptions xdfde339da46db651) at MindFusion.Diagramming.Wpf.ShapeNode.Draw(DrawingContext graphics, RenderOptions options) at Components.ValueObject.QuestionNode.Draw(DrawingContext graphics, RenderOptions options) in C:\Source\QuestionNode.cs:line 51 Thanks


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tusharpateluk YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 37 Joined: Sep 3^rd, 2008	Re: Error after LoadfromXML for Custom Shape node Reply #1 - Oct 1^st, 2008 at 12:58pm	Print Post
	While handling the exception on the Draw method, if I don't throw any exception then execution continues and Diagram is loaded. But, I am still not sure, if it is a bug or I might be missing something. Below is the Draw method. public override void Draw(DrawingContext graphics, MindFusion.Diagramming.Wpf.RenderOptions options) { try { base.Draw(graphics, options); } catch (Exception) { } } Please help me, if you have faced similar problem


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Error after LoadfromXML for Custom Shape node Reply #2 - Oct 1^st, 2008 at 1:49pm	Print Post
	Could you also post the LoadFromXml override code here?


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tusharpateluk YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 37 Joined: Sep 3^rd, 2008	Re: Error after LoadfromXML for Custom Shape node Reply #3 - Oct 2^nd, 2008 at 2:49pm	Print Post
	Below is the LoadfromXML method along with the SetCustomData method protected override void LoadFromXml(XmlElement xmlElement, MindFusion.Diagramming.Wpf.XmlPersistContext context) { SetCustomData(xmlElement); base.LoadFromXml(xmlElement, context); } private void SetCustomData(XmlElement doc) { question = new QuestionProperty(); question.StepNumber = doc.SelectSingleNode("Question/StepNumber").InnerText; ("Question/Explanation").InnerText; question.Eval = doc.SelectSingleNode("Question/Eval").InnerText; }


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Error after LoadfromXML for Custom Shape node Reply #4 - Oct 2^nd, 2008 at 3:02pm	Print Post
	Have you also overridden the OnLoad method by any chance?


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tusharpateluk YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 37 Joined: Sep 3^rd, 2008	Re: Error after LoadfromXML for Custom Shape node Reply #5 - Oct 2^nd, 2008 at 3:45pm	Print Post
	No, I have not override OnLoad method. Do I need to ? As per my understanding and debugging, After LoadfromXML, draw method is called and once all the nodes are drawn then OnLoad method get's called. Please let me know if you have any suggestion.


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Error after LoadfromXML for Custom Shape node Reply #6 - Oct 3^rd, 2008 at 10:26am	Print Post
	Could you email the QuestionNode code to support@mindfusion.eu? What value does the Text property have when the exception happens?


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