topic Bug: Serialization of Attribute values in ArcGIS Runtime SDK for WPF (Retired) Questions

Bug: Serialization of Attribute values

BKuiper — Thu, 09 Jan 2014 10:28:08 GMT

Hi,

I found a bug in ArcGIS Runtime for WPF version: 10.1.1.0 when using ToJson() to serialize a GraphicsLayer. It seems that attribute values are not serialized correctly as they lose their original datatype and are converted into strings.

the error is in the following line
jw.WriteProperty(pair.Key, (pair.Value != null) ? string.Format(CultureInfo.InvariantCulture, "{0}", new object[] { pair.Value }) : null);

within
public static void WriteAttributes(ArcGISJsonWriter jw, IDictionary<string, object> attributes, bool onlyDirty, Dictionary<string, object> dirtyList, List<string> fields, string objectIdField)

Because of the string.format() call the value of the attribute, whether it is a boolean, double or string, is converted into a string and then stored as
key: "value"

in the json, instead of (with a double)
key: value

This bug is pretty inconvenient for us as it affects our application and thus our users.

Is this fixed in the latest release of ArcGIS Runtime ? Sadly enough we can't yet upgrade to VS2012 or VS2013 and are still using VS2010.

Can you confirm the bug and perhaps give advise on how to proceed to get this fixed for our installation that would work on VS2010.

Thanks!

Re: Bug: Serialization of Attribute values

DavidLednik — Tue, 14 Jan 2014 13:27:26 GMT

Hi Bjorn,

From the code provided it's not really clear how you serialize the layer.
Can you show bigger block of code or even better attach a small reproducible sample app?

regards,
David

Re: Bug: Serialization of Attribute values

BKuiper — Sat, 11 Dec 2021 20:53:08 GMT

Hi David,

I'm calling ToJson on FeatureSet. I get the GraphicsLayer, group by geometry and serialize the group one by one by creating a new FeatureSet object and calling ToJson(true).

So the problem is that the attributes on the FeatureSet are stored as key,value <string, string> instead of <string, object>, due to the call to string.format as explained in my original post.

                    GraphicsLayer gl = layer as GraphicsLayer;
                    if (gl != null)
                    {
                        var graphicsByGeometry = gl.Graphics.GroupBy(x => x.Geometry.GetType());
                        foreach (var group in graphicsByGeometry)
                        {
                            List<Graphic> graphics = group.ToList();
                            FeatureSet fs = new FeatureSet(graphics);
                            jsonfeaturesets.JsonFeatures.Add(fs.ToJson(true));
                        }
                    }

Re: Bug: Serialization of Attribute values

BKuiper — Sun, 09 Feb 2014 20:02:18 GMT

It seems that the code in 10.2 is still broken

                    if (fields == null)
                    {
                        jw.WriteProperty(pair.Key, (pair.Value != null) ? string.Format(CultureInfo.InvariantCulture, "{0}", new object[] { pair.Value }) : null);
                    }

public static void WriteAttributes(ArcGISJsonWriter jw, IDictionary<string, object> attributes, bool onlyDirty, Dictionary<string, object> dirtyList, List<string> fields, string objectIdField)

of class ESRI.ArcGIS.Client.Tasks.Utils.JSON.ArcGISJsonWriter

It should not use string.format to write the result as attributes are of dictionary type <string, object> not <string, string> and in this case, will lose its type definition.

Re: Bug: Serialization of Attribute values

BKuiper — Thu, 10 Apr 2014 11:16:50 GMT

It seems that setting the Fields collection on the FeatureSet object (by looping through the attributes and creating them) mitigates this issue.

Re: Bug: Serialization of Attribute values

dotMorten_esri — Wed, 15 Oct 2014 20:41:03 GMT

Yes it is required to set the Fields property to ensure proper type serialization, or the fallback will be strings.