How to save ESRI.ArcGIS.Client.Graphic object into isolated storage

Question

I am attempting to save an ESRI.ArcGIS.Client.Graphic object into silverlight's isolated storage.

My code appears as such:

private void GraphicQueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs queryEventArgs)
{
 //...
 FeatureSet featureSet = queryEventArgs.FeatureSet;
 string featureSetDisplayName = featureSet.DisplayFieldName;
 //...
 foreach (Graphic graphicFeature in featureSet.Features)
 {
 
 using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
 {
 using (IsolatedStorageFileStream isoStream =
 new IsolatedStorageFileStream(featureSetDisplayName, FileMode.Create, isoStore))
 { 
 // What do I do here?  
 
 }
 }
 // ...
 }
}

I don't know what do do to save the Graphic object graphicFeature into isolated storage once I have my IsolatedStorageFileStream.

DorothyMortenson · Answer

Hi Babak,
I found a comment you had on this site, regarding printing to pdf:
http://forums.silverlight.net/t/118030.aspx/2/10#

I wondered if you ever found a resolution to this. It sounds like this thread is related.

Dorothy

Teresa_Blader_3-1768586004175.png

DominiqueBroux · Answer

You can tweak the code from a GraphicsLayer extension to a graphics list extension: public static class GraphicsExtension { public static void SerializeGraphics(this IList graphics, XmlWriter writer) { XMLSerialize(writer, new SerializableGraphicCollection(graphics)); } public static void DeserializeGraphics(this IList graphics, XmlReader reader) { foreach (SerializableGraphic g in XMLDeserialize(reader)) { graphics.Add(g.Graphic); } } ...... You have also to change the argument of SerializableGraphicCollection public SerializableGraphicCollection(IEnumerable graphicCollection) This version is even much better since useable in both cases (graphicsLayer.Graphics or featureSet.Features):)

BabakSekandari1 · Answer

Hmmm, I ran into an obstacle.

In the GraphicsLayerExtension.cs file, I tried to convert the following function:

public static void SerializeGraphics(this GraphicsLayer graphicsLayer, XmlWriter writer)
  {
   XMLSerialize(writer, new SerializableGraphicCollection(graphicsLayer.Graphics));
  }

into the following function:

public static void SerializeGraphic(this Graphic graphic, XmlWriter writer)
        {
            XMLSerialize(writer, new SerializableGraphicCollection(graphic.Graphics()));
        }

But that doesn't work because the Graphic class does not have a Graphics property the way the GraphicsLayer class has a Graphics property.

I tried using a graphic.Geometry property, but that doesn't work because SerializableGraphicCollection() accepts a GraphicsLayer object, not a Graphic object.

So, I'm going to try to tweak the SerializableGraphicCollection() method in the DataContracts.cs file to accept a Graphic object in the constructor.