topic Re: Convert Geomtry to Json in ArcObjects SDK Questions

Convert Geomtry to Json

mody_buchbinder — Thu, 14 Apr 2022 11:24:25 GMT

In arcpy you just do geometry.JSON to get the json string for it.

I could not find a simple way to do the same in ArcObjects.

Convert single geometry (not in feature class) into json (or GeoJson) string.

The GeometryEngine in Pro SDK have ExportToJson.

Anybody?

Re: Convert Geomtry to Json

GKmieliauskas — Fri, 15 Apr 2022 05:35:50 GMT

Hi,

If you use ArcObjects .NET SDK 10.8 you can use JSONConverterGdb class . I don't know if it is available in earlier versions.

Another way is to use .NET serializer:

public static string To<T>(T obj) { string retVal = null; System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(obj.GetType()); using (MemoryStream ms = new MemoryStream()) { serializer.WriteObject(ms, obj); retVal = Encoding.Default.GetString(ms.ToArray()); } return retVal; }

Re: Convert Geomtry to Json

mody_buchbinder — Sun, 17 Apr 2022 12:03:27 GMT

I will give it a try.

I checked the ArcObjects JSONConverterGdb but as far as I understand it gets a Table and not single geometry. I will have to create a temporary table and gets all the attributes and not only geometry.

Thanks

Re: Convert Geomtry to Json

GKmieliauskas — Tue, 19 Apr 2022 05:22:57 GMT

There is method for geometry serializing:

- IExternalSerializerGdb.WriteGeometry Method (ArcObjects .NET 10.8 SDK) (arcgis.com)

Re: Convert Geomtry to Json

mody_buchbinder — Sun, 24 Apr 2022 14:17:28 GMT

Here is my final code. The doc's are real bad , no samples and every small change gives catastrophic error with no error message.

Have fun

private string geo2json(IFeature feature) { IJSONWriter jsonWriter = new JSONWriterClass(); jsonWriter.WriteToString(); IJSONSerializer jsonSerializer = new JSONSerializerGdb(); IPropertySet props = new PropertySetClass(); props.SetProperty("Format", "GeoJSON"); jsonSerializer.InitSerializer(jsonWriter, props); ((IExternalSerializerGdb)jsonSerializer).WriteGeometry(null, feature.Shape); var geoJson = Encoding.UTF8.GetString(jsonWriter.GetStringBuffer()); return geoJson; }

Re: Convert Geomtry to Json

FredericWalter — Thu, 26 Oct 2023 15:53:54 GMT

Another way to do the work is to use JSONConverterGeometry:

IJSONConverterGeometry JSONConverterGeometry = new JSONConverterGeometryClass(); IJSONObject JSONGeometry = new JSONObjectClass(); JSONConverterGeometry.QueryJSONGeometry(geometry, true, JSONGeometry); string strGeometry = JSONGeometry.ToJSONString(null);

Maybe a litlle bit simplier ...