Configuration for accessing Amazon ListKeys service
Inheritance: ListKeysResult
        public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
        {
            ListKeysResponse response = new ListKeysResponse();

            context.Read();
            int targetDepth = context.CurrentDepth;
            while (context.ReadAtDepth(targetDepth))
            {
                if (context.TestExpression("Keys", targetDepth))
                {
                    var unmarshaller = new ListUnmarshaller<KeyListEntry, KeyListEntryUnmarshaller>(KeyListEntryUnmarshaller.Instance);
                    response.Keys = unmarshaller.Unmarshall(context);
                    continue;
                }
                if (context.TestExpression("NextMarker", targetDepth))
                {
                    var unmarshaller = StringUnmarshaller.Instance;
                    response.NextMarker = unmarshaller.Unmarshall(context);
                    continue;
                }
                if (context.TestExpression("Truncated", targetDepth))
                {
                    var unmarshaller = BoolUnmarshaller.Instance;
                    response.Truncated = unmarshaller.Unmarshall(context);
                    continue;
                }
            }

            return response;
        }