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Receives binding warning in debug output

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Tormod
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Tormod asked on 17 Aug 2012, 09:37 AM
I receive this message when binding to a graphsource for each connection in the graphsource:
System.Windows.Data Error: 40 : BindingExpression path error: 'Content' property not found on 'object' ''SeqLink' (HashCode=58169988)'. BindingExpression:Path=Content; DataItem='SeqLink' (HashCode=58169988); target element is 'ContentPresenter' (Name=''); target property is 'Content' (type 'Object')

Commenting out all binding in the Style for connections in xaml does not help.

internal class SeqLink:ILink<SeqStep>
    {
        public string ConnectionSide { get; internal set; }
 
        object ILink.Source
        {
            get { return Source; }
            set { Source = (SeqStep) value; }
        }
 
        public SeqStep Target { get; set; }
 
        //Uncomment either of these to remove the runtime binding error in debug window. However, the appearance is unchanged, AFAICT.
 
        //public string Content
        //{
        //    get { return String.Empty; }
        //    set { throw new NotImplementedException("Set content was called");}
        //}
 
        //public FrameworkElement Content
        //{
        //    get { return new Button() {Height = 30,Width = 30,Content = "SampleText"}; }
        //    set { throw new NotImplementedException("Set was called"); }
        //}
 
        public SeqStep Source { get; set; }
 
        object ILink.Target
        {
            get { return Target; }
            set { Target = (SeqStep) value; }
        }
    }

Have I done something wrong, is this a bug or is there something that I should be exposing through this property that would achieve some functionality that I fail to grasp? 

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Alex Fidanov
Telerik team
answered on 22 Aug 2012, 07:18 AM
Hi,

 The binding seems to be resolving the correct property of source object, but still fails. I believe this is because the SeqLink class is internal. If you make it public, then it would be able to correctly find the Content property. Moreover, I would recommend using another name different than 'Content' for your property in the SeqLink class. The RadDiagramConnection already has a Content property (of type object) and there could be some ambiguity between the two properties.

Greetings,
Alex Fidanov
the Telerik team

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