Home / Community & Support / Developer Productivity Tools Forums / Silverlight > Map > Problem using SQLGeospatialDataReader & InformationLayer.GetBestView

• Brent

  Posted on Dec 14, 2011 (permalink)

  If I use SQLGeospatialDataReader to populate my InformationLayer with data, the InformationLayer.GetBestView method does not work.
  
  Even though I can see data from my InformationLayer on the map, when I debug, InformationLayer.Items is empty (has Count = 0). So when InformationLayer.Items gets passed to GetBestView method, the result is wrong.
  
  Please help.
  
  Here is a code snippet to illustrate.
  
  

  private InformationLayer informationLayer = new InformationLayer();     

  public InformationLayer IL

          {

              get

              {

                  return informationLayer;

              }

              set

              {

                  informationLayer = value;

              }

          }

     

  public SqlGeospatialDataReader SQLR = new SqlGeospatialDataReader();

   

  //Use SQLR to read geospatial data from SQL Server

  ReadSQLGeospatialData();

   

  IL.Reader = SQLR;

     

  LocationRect BestViewRect = IL.GetBestView(IL.Items);

  Reply

• Andrey Andrey

  Posted on Dec 19, 2011 (permalink)

  Hi Brent,
  
  The SQLGeospatialDataReader reads data asynchronously. So, to avoid a problem with incorrect "Best View" calculation you should handle the SQLGeospatialDataReader.ReadCompleted event which occurs when the reading complete and when the read shapes are already added to the information layer.
  
  Kind regards,
  Andrey Murzov
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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