Error 2203 when assigning Silverlight collections RSS

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  sompost

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  Error 2203 when assigning Silverlight collections

  Dec 18, 2007 09:05 AM | LINK

  I have found a few instances (there might be more) where assigning a run-time created collection object (e.g. a GradientStopCollection) to the corresponding property (e.g. GradientStops) invariably causes an error 2203. Note that the Silverlight reference explicitely permits such assignments. Here's a minimal example:

  var plugin=canvas.getHost();
  var lgb=plugin.content.createFromXaml("<LinearGradientBrush/>");
  lgb.GradientStops=plugin.content.createFromXaml("<GradientStopCollection/>"); //ERROR 2203
  lgb.GradientStops.Add(plugin.content.createFromXaml("<GradientStop Color='Red' Offset='0.0'/>")); //OK

  Likewise with PathGeometry's Figures property. Assigning a PathFigureCollection causes error 2203. This is particularly absurd as the Figures property is initially actually null (i.e. you cannot append anything to it).

  var pg=plugin.content.createFromXaml("<PathGeometry/>");
  pg.Figures=plugin.content.createFromXaml("<PathFigureCollection/>"); //ERROR 2203
  pg.Figures.Add(plugin.content.createFromXaml("<PathFigure/>")); //ERROR Figures is null

  Unless I'm doing something really dumb here (which is thoroughly possible), it's either a bug in Silverlight or in the documentation.

  Any ideas? Thanks!

  JavaScript error 2203 bug

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  Yi-Lun Luo -...

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  Re: Error 2203 when assigning Silverlight collections

  Dec 20, 2007 03:45 AM | LINK

  Hello, for GradientBrush, you don’t need to specify a GradientStopCollection. It has been already created for you. You can directly add children. For PathGeometry, you can use createFromXaml("<PathGeometry><PathFigureCollection/ ></PathGeometry>"). This won’t cause an error. Looks like there’re some problems with JavaScript here. In managed code, if you use:

   

  brush.GradientStops = new GradientStopCollection();

  pg.Figures = new PathFigureCollection();

   

  Or even:

  GradientStopCollection collection = (GradientStopCollection)XamlReader.Load("<GradientStopCollection/>");

  brush.GradientStops = collection;

   

  It won’t cause any errors.

   

  shanaolanxing - I'll transfer to the Windows Azure team, and will have limited time to participate in the Silverlight forum. Apologize if I don't answer your questions in time.