Newtonsoft.Json.JsonSerializer.Populate C# (CSharp) Method

    public void Populate(JsonReader reader, object target)
    {
      PopulateInternal(reader, target);
    }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
            JsonSerializer serializer)
        {
            JObject o = JObject.Load(reader);

            var prop = o.Properties().First();
            var key = prop.Name;
            switch (key)
            {
                case "delete":
                    var deleteItem = new BulkDeleteResponseItem();
                    serializer.Populate(prop.Value.CreateReader(), deleteItem);
                    if (deleteItem != null)
                        deleteItem.Operation = key;
                    return deleteItem;
                case "index":
                    var indexItem = new BulkIndexResponseItem();
                    serializer.Populate(prop.Value.CreateReader(), indexItem);
                    if (indexItem != null)
                        indexItem.Operation = key;
                    return indexItem;
                case "create":
                    var createItem = new BulkCreateResponseItem();
                    serializer.Populate(prop.Value.CreateReader(), createItem);
                    if (createItem != null)
                        createItem.Operation = key;
                    return createItem;
            }
            return null;
        }