Question

我有一个嵌套对象

public class CardListViewModel
{

    public virtual Guid Id { get; set; }


    public virtual IEnumerable<Card> CardList { get; set; }

}

public class Card
{       
    public virtual Guid Id { get; set; }

    public virtual string IndexName { get; set; }

    public virtual Image CardImage { get; set; }
}

public class Image
{
//... 
public virtual string Src { get; set; }
//...
}

所以卡可能是

CardListViewModel.CardList[0] = {Id:5678, IndexName:"Visa", {Src:"Visa.png"}}
CardListViewModel.CardList[1] = {Id:5555, IndexName:"MasterCard", {Src:"MasterCard.png"}}

我想要的结果是Json对象，如下所示

{
    "Visa": "Visa.png",
    "MasterCard": "MasterCard.png"
}

我无法修改POCO，我想要的只是列表中每张卡的JSON片段及其相应的图像。当然，我可以使用StringBuilder和循环来强制执行此操作，但我想知道是否有办法通过JsonConvert库或任何其他可以为我处理映射的好工具来完成此操作？

Answer 1

我使用LINQ来映射它，使用NewtonsoftJson来构建JSON。

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Linq;

var mappedCards = JsonConvert.SerializeObject(new JObject (
  from card in CardListViewModel.CardList
  select new JProperty(card.IndexName, card.CardImage.Src)));

Answer 2

鉴于我无法修改POCO 并且您希望使用json.net，您可以为using Newtonsoft.Json; using Newtonsoft.Json.Linq; using Newtonsoft.Json.Converters; using Newtonsoft.Json.Serialization; public class CardListConverter : JsonConverter { public override bool CanConvert(Type objectType) { return typeof(IEnumerable<Card>).IsAssignableFrom(objectType); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { if (reader.TokenType == JsonToken.Null) return null; var list = existingValue as ICollection<Card> ?? new List<Card>(); var obj = JObject.Load(reader); foreach (var property in obj.Properties()) { list.Add(new Card { IndexName = property.Name, CardImage = new Image { Src = (string)property.Value } }); } return list; } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { var collection = (IEnumerable<Card>)value; writer.WriteStartObject(); foreach (var item in collection) { writer.WritePropertyName(item.IndexName); writer.WriteValue(item.CardImage == null ? null : item.CardImage.Src); } writer.WriteEndObject(); } }类型的对象创建custom JsonConverter作为如下：

var settings = new JsonSerializerSettings
{
    Converters = { new CardListConverter() },
};
var json = JsonConvert.SerializeObject(CardListViewModel, Formatting.Indented, settings);

然后在序列化设置中使用它，如下所示：

CardListViewModel

您的{ "Id": "c2a7cc0f-0e6b-40a0-9020-aeba436265d4", "CardList": { "Visa": "Visa.png", "MasterCard": "MasterCard.png" } }将按如下方式序列化：

public void updateChild()
{
    listaXBaldas.Clear();
    listaYBaldas.Clear();
    hueco1.updateChildAux();
    hueco2.updateChildAux();

}

private void updateChildAux()
{

    if (division == -1) return;
    else
    {
        aux1 = balda.transform.position.y;
        aux2 = balda.transform.position.x;
        listaYBaldas.Add(aux1);
        listaXBaldas.Add(aux2);
        Debug.Log(listaXBaldas.Count);
        hueco1.updateChildAux();
        hueco2.updateChildAux();
    }
}

示例fiddle。

将特定对象字段转换为Json

2 个答案: