System.Runtime.Serialization.Json.JsonDataContract.TryReadNullAtTopLevel C# (CSharp) Метод

        protected static bool TryReadNullAtTopLevel(XmlReaderDelegator reader)
        {
            if (reader.MoveToAttribute(JsonGlobals.typeString) && (reader.Value == JsonGlobals.nullString))
            {
                reader.Skip();
                reader.MoveToElement();
                return true;
            }

            reader.MoveToElement();
            return false;
        }

 public override object ReadJsonValueCore(XmlReaderDelegator jsonReader, XmlObjectSerializerReadContextComplexJson context)
 {
     if (context != null)
     {
         return(JsonDataContract.HandleReadValue(jsonReader.ReadElementContentAsUri(), context));
     }
     if (!JsonDataContract.TryReadNullAtTopLevel(jsonReader))
     {
         return(jsonReader.ReadElementContentAsUri());
     }
     return(null);
 }