arcobjects - How can I deserialize json to create an IRecordset?

I've got a Silverlight client that serializes a FeatureSet and sends to an SOE. I'd like for the SOE to deserialize the json into an IRecordSet. ESRI.ArcGIS.SOESupport.Conversion has a method for going from IRecordset to json, but not the reverse.

How can I deserialize json to create an IRecordset?

{
    "displayFieldName": "",
    "fieldAliases": {
        "OBJECTID": "OBJECTID",
        "DissolveID": "DissolveID",

        "CatchID": "CatchID",
        "Length": "Length",
        "Fnode": "Fnode",
        "Tnode": "Tnode",
        "CatchID2": "CatchID2",
        "OrigOID": "OrigOID",
        "Shape_Length": "Shape_Length"
    },
    "geometryType": "esriGeometryPolyline",
    "spatialReference": {

        "wkid": 102113
    },
    "fields": [
        {
            "name": "OBJECTID",
            "type": "esriFieldTypeOID",
            "alias": "OBJECTID"
        },
        {
            "name": "DissolveID",

            "type": "esriFieldTypeInteger",
            "alias": "DissolveID"
        },
        {
            "name": "CatchID",
            "type": "esriFieldTypeDouble",
            "alias": "CatchID"
        },
        {
            "name": "Length",

            "type": "esriFieldTypeDouble",
            "alias": "Length"
        },
        {
            "name": "Fnode",
            "type": "esriFieldTypeInteger",
            "alias": "Fnode"
        },
        {
            "name": "Tnode",

            "type": "esriFieldTypeInteger",
            "alias": "Tnode"
        },
        {
            "name": "CatchID2",
            "type": "esriFieldTypeInteger",
            "alias": "CatchID2"
        },
        {
            "name": "OrigOID",

            "type": "esriFieldTypeInteger",
            "alias": "OrigOID"
        },
        {
            "name": "Shape_Length",
            "type": "esriFieldTypeDouble",
            "alias": "Shape_Length"
        }
    ],
    "features": [

        {
            "attributes": {
                "OBJECTID": 1,
                "DissolveID": 27595,
                "CatchID": 27595,
                "Length": 2781.07146565,
                "Fnode": 26156,
                "Tnode": 26157,
                "CatchID2": 27595,
                "OrigOID": 26064,

                "Shape_Length": 3396.52480192211
            },
            "geometry": {
                "paths": [
                    [
                        [
                            -12199216.57915191,
                            4173685.6358526573
                        ],
                        [

                            -12201719.387905361,
                            4170671.685971223
                        ],
// (snip)
                        [
                            -12201768.97746418,
                            4170677.9241078123
                        ]
                    ]
                ]

            }
        }
    ]
}

Answer

You can use ESRI.ArcGIS.Geodatabase.IJSONConverterGdb

The operation handler in your SOE would have something like this:

JsonObject jsonObj;
            bool found = operationInput.TryGetJsonObject("RecordSet", out jsonObj);
            if (!found)

                throw new ArgumentNullException("RecordSet");

            string recordSetJsonString = jsonObj.ToJson();
            IJSONReader jsonReader = new JSONReaderClass();
            jsonReader.ReadFromString(recordSetJsonString);

            IJSONConverterGdb jsonConverterGdb = new JSONConverterGdbClass();

            IPropertySet originalToNewFieldMap;
            IRecordSet recordSet;

            jsonConverterGdb.ReadRecordSet(jsonReader, null, null, out recordSet, out originalToNewFieldMap);