How can I serialize/deserialize a kind of json mixing object and list of object at the same level in c#?

huangapple
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英文:

How can I serialize/deserialize a kind of json mixing object and list of object at the same level in c#?

问题

我正在使用Newtonsoft JSON，并且需要序列化/反序列化这种类型的JSON：

  1. [
  2.   {
  3.     "value": "value1",
  4.     "field": "field1"
  5.   },
  6.   {
  7.     "value": "value2",
  8.     "field": "field2"
  9.   },
  10.   {
  11.     "value": "value3",
  12.     "field": "field3"
  13.   },
  14.   [
  15.     {
  16.       "value": "value4",
  17.       "field": "field4"
  18.     },
  19.     {
  20.       "value": "value4",
  21.       "field": "field5"
  22.     }
  23.   ]
  24. ]

正如您所见，我可以在同一级别同时拥有一个对象或这个对象的列表。我已经为该对象创建了一个类，但我不知道如何使序列化过程处理这种类型的JSON，或者是否可以这样做。

编辑：我没有选择处理我收到的JSON。因此，请不要认为我喜欢这样做，如果您这么认为，是错误的。

英文:

I'm using newtonsoft json, and I need to serialize/deserialize this kind of json:

  1. [
  2.   {
  3.     "value": "value1",
  4.     "field": "field1"
  5.   },
  6.   {
  7.     "value": "value2",
  8.     "field": "field2"
  9.   },
  10.   {
  11.     "value": "value3",
  12.     "field": "field3"
  13.   },
  14.   [
  15.     {
  16.       "value": "value4",
  17.       "field": "field4"
  18.     },
  19.     {
  20.       "value": "value4",
  21.       "field": "field5"
  22.     }
  23.   ]
  24. ]

As you can see, I can have an object or a list of this object at the same level. I've created a class for the object but I don't know how to make the serialization process this kind of json, or if it's possible to do.

EDIT: I don't have the choice to process that json as it comes to me. So please, if you think I like this, you're wrong.

答案1

得分: 1

你可以创建一个自定义的JSON转换器：

  1. Result result = JsonConvert.DeserializeObject<Result>(json, new ArrayJsonConverter());

以下是自定义的ArrayJsonConverter类：

  1. public class ArrayJsonConverter : JsonConverter<Result>
  2. {
  3.     public override Result ReadJson(JsonReader reader, Type objectType, Result existingValue, bool hasExistingValue, JsonSerializer serializer)
  4.     {
  5.         JArray jArr = JArray.Load(reader);
  7.         var result = new Result { Items = new List<Item>(), ListItems = new List<List<Item>>() };
  9.         foreach (var item in jArr)
  10.             if (item.Type == JTokenType.Array) result.ListItems.Add(item.ToObject<List<Item>>());
  11.             else result.Items.Add(item.ToObject<Item>());
  13.         return result;
  14.     }
  16.     public override void WriteJson(JsonWriter writer, Result value, JsonSerializer serializer)
  17.     {
  18.         throw new NotImplementedException();
  19.     }
  20. }

接下来是Result类：

  1. public class Result
  2. {
  3.     public List<Item> Items { get; set; }
  4.     public List<List<Item>> ListItems { get; set; }
  5. }

最后是Item类：

  1. public class Item
  2. {
  3.     public string value { get; set; }
  4.     public string field { get; set; }
  5. }
英文:

you can create a custom json converter

  1. Result result = JsonConvert.DeserializeObject&lt;Result&gt;(json, new ArrayJsonConverter())
  3. public class ArrayJsonConverter : JsonConverter&lt;Result&gt;
  4. {
  5. 	public override Result ReadJson(JsonReader reader, Type objectType, Result existingValue, bool hasExistingValue, JsonSerializer serializer)
  6. 	{
  7. 		JArray jArr = JArray.Load(reader);
  9. 		var result = new Result { Items = new List&lt;Item&gt;(), ListItems = new List&lt;List&lt;Item&gt;&gt;() };
  11. 		foreach (var item in jArr)
  12. 			if (item.Type == JTokenType.Array) result.ListItems.Add(item.ToObject&lt;List&lt;Item&gt;&gt;());
  13. 			else result.Items.Add(item.ToObject&lt;Item&gt;());
  15. 		return result;
  16. 	}
  18. 	public override void WriteJson(JsonWriter writer, Result value, JsonSerializer serializer)
  19. 	{
  20. 		throw new NotImplementedException();
  21. 	}
  22. }
  24. public class Result
  25. {
  26. 	public List&lt;Item&gt; Items { get; set; }
  27. 	public List&lt;List&lt;Item&gt;&gt; ListItems { get; set; }
  28. }
  30. public class Item
  31. {
  32. 	public string value { get; set; }
  33. 	public string field { get; set; }
  34. }

答案2

得分: 0

以下是我找到的解决方案，感谢您的帮助：

  1. public class Item
  2. {
  3.     public string Value { get; set; }
  4.     public string Field { get; set; }
  5. }
  7. public class ItemContainer
  8. {
  9.     public List<Item> Items { get; set; }
  10.     public List<List<Item>> NestedItems { get; set; }
  11. }
  13. public class ItemContainerConverter : JsonConverter<ItemContainer>
  14. {
  15.     public override ItemContainer ReadJson(JsonReader reader, Type objectType, ItemContainer existingValue,
  16.         bool hasExistingValue, JsonSerializer serializer)
  17.     {
  18.         var jsonObject = JArray.Load(reader);
  19.         var itemContainer = new ItemContainer
  20.         {
  21.             Items = new List<Item>(),
  22.             NestedItems = new List<List<Item>>()
  23.         };
  25.         foreach (var token in jsonObject)
  26.         {
  27.             if (token.Type == JTokenType.Array)
  28.             {
  29.                 var nestedItemList = token.ToObject<List<Item>>();
  30.                 itemContainer.NestedItems.Add(nestedItemList);
  31.             }
  32.             else if (token.Type == JTokenType.Object)
  33.             {
  34.                 var item = token.ToObject<Item>();
  35.                 itemContainer.Items.Add(item);
  36.             }
  37.         }
  39.         return itemContainer;
  40.     }
  42.     public override void WriteJson(JsonWriter writer, ItemContainer value, JsonSerializer serializer)
  43.     {
  44.         writer.WriteStartArray();
  46.         foreach (var item in value.Items)
  47.         {
  48.             serializer.Serialize(writer, item);
  49.         }
  51.         if (value.NestedItems != null && value.NestedItems.Any())
  52.         {
  53.             writer.WriteStartArray();
  54.             foreach (var nestedItem in value.NestedItems.SelectMany(nestedList => nestedList))
  55.             {
  56.                 serializer.Serialize(writer, nestedItem);
  57.             }
  58.             writer.WriteEndArray();
  59.         }
  61.         writer.WriteEndArray();
  62.     }
  63. }

以下是如何使用它的方式：

  1. var settings = new JsonSerializerSettings()
  2. {
  3.     ContractResolver = new DefaultContractResolver
  4.     {
  5.         NamingStrategy = new SnakeCaseNamingStrategy()
  6.     }
  7. };
  8. settings.Converters.Add(new ItemContainerConverter());
  10. var rootObject = JsonConvert.DeserializeObject<ItemContainer>(jsonString, settings);
  11. var json = JsonConvert.SerializeObject(rootObject, settings);

希望这对您有所帮助！如果您有任何其他问题，请随时提出。

英文:

Here is the solution I found thanks to your help:

  1. public class Item
  2. {
  3.     public string Value { get; set; }
  4.     public string Field { get; set; }
  5. }
  7. public class ItemContainer
  8. {
  9.     public List&lt;Item&gt; Items { get; set; }
  10.     public List&lt;List&lt;Item&gt;&gt; NestedItems { get; set; }
  11. }
  13. public class ItemContainerConverter : JsonConverter&lt;ItemContainer&gt;
  14. {
  15.     public override ItemContainer ReadJson(JsonReader reader, Type objectType, ItemContainer existingValue,
  16.         bool hasExistingValue, JsonSerializer serializer)
  17.     {
  18.         var jsonObject = JArray.Load(reader);
  19.         var itemContainer = new ItemContainer
  20.         {
  21.             Items = new List&lt;Item&gt;(),
  22.             NestedItems = new List&lt;List&lt;Item&gt;&gt;()
  23.         };
  25.         foreach (var token in jsonObject)
  26.         {
  27.             if (token.Type == JTokenType.Array)
  28.             {
  29.                 var nestedItemList = token.ToObject&lt;List&lt;Item&gt;&gt;();
  30.                 itemContainer.NestedItems.Add(nestedItemList);
  31.             }
  32.             else if (token.Type == JTokenType.Object)
  33.             {
  34.                 var item = token.ToObject&lt;Item&gt;();
  35.                 itemContainer.Items.Add(item);
  36.             }
  37.         }
  39.         return itemContainer;
  40.     }
  42.     public override void WriteJson(JsonWriter writer, ItemContainer value, JsonSerializer serializer)
  43.     {
  44.         writer.WriteStartArray();
  46.         foreach (var item in value.Items)
  47.         {
  48.             serializer.Serialize(writer, item);
  49.         }
  51.         if (value.NestedItems != null &amp;&amp; value.NestedItems.Any())
  52.         {
  53.             writer.WriteStartArray();
  54.             foreach (var nestedItem in value.NestedItems.SelectMany(nestedList =&gt; nestedList))
  55.             {
  56.                 serializer.Serialize(writer, nestedItem);
  57.             }
  58.             writer.WriteEndArray();
  59.         }
  61.         writer.WriteEndArray();
  62.     }
  63. }

And there is how to use it:

  1. var settings = new JsonSerializerSettings()
  2. {
  3.     ContractResolver = new DefaultContractResolver
  4.     {
  5.         NamingStrategy = new SnakeCaseNamingStrategy()
  6.     }
  7. };
  8. settings.Converters.Add(new ItemContainerConverter());
  10. var rootObject = JsonConvert.DeserializeObject&lt;ItemContainer&gt;(jsonString, settings);
  11. var json = JsonConvert.SerializeObject(rootObject, settings);

huangapple
  • 本文由 发表于 2023年7月4日 21:27:38
  • 转载请务必保留本文链接：https://go.coder-hub.com/76613143.html
  • c#
  • deserialization
  • json
  • json.net
  • serialization
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