Json.net反序列化不一致的JSON

Question

Json.net反序列化不一致的JSON

4

我正在处理一个不一致的Json数据，想要将其反序列化为我的.Net类。问题是有时我有一个对象，有时它是一个数组。如何最好地解决这个问题？使用转换器？以下是我的Json数据片段：

[
{
"@class": "odd",
"td": [
  {
    "@class": "user",
    "@onmouseover": "userInfo('469');",
    "@onmouseout": "userInfo(0);",
    "@onmousemove": "moveSlotInfo();",
    "#text": " AAA"
  },
  {
    "@id": "day-469-2014-04-07",
    "@style": "vertical-align: top;",
    "table": {
      "@class": "ss",
      "@cellspacing": "1",
      "tbody": {
        "tr": {
          "td": {
            "@class": "as",
            "@style": "color: #ffffff; background-color: #4040ff;",
            "@onmouseover": "this.className=(document.week_vs_doctor.activityId.value==-1?'sd':'sp');slotInfo('177935',false);",
            "@onmouseout": "this.className='as';slotInfo(0,false);",
            "@onmousemove": "moveSlotInfo();",
            "#text": "KAVAul"
          }
        }
      }
    }
  }
]
},
{
"@class": "even",
"td": [
  {
    "@class": "user",
    "@onmouseover": "userInfo('262');",
    "@onmouseout": "userInfo(0);",
    "@onmousemove": "moveSlotInfo();",
    "#text": " BBB"
  },
  {
    "@id": "day-262-2014-04-07",
    "@style": "vertical-align: top;",
    "table": {
      "@class": "ss",
      "@cellspacing": "1",
      "tbody": {
        "tr": [
          {
            "td": {
              "@class": "as",
              "@style": "color: #ffffff; background-color: #4040ff;",
              "@onmouseover": "this.className=(document.week_vs_doctor.activityId.value==-1?'sd':'sp');slotInfo('174318',false);",
              "@onmouseout": "this.className='as';slotInfo(0,false);",
              "@onmousemove": "moveSlotInfo();",
              "#text": "KAVA "
            }
          },
          {
            "td": {
              "@class": "as",
              "@style": "color: #000000; background-color: #ffc0c0;",
              "@onmouseover": "this.className=(document.week_vs_doctor.activityId.value==-1?'sd':'sp');slotInfo('174338',false);",
              "@onmouseout": "this.className='as';slotInfo(0,false);",
              "@onmousemove": "moveSlotInfo();",
              "#text": "Dagbak"
            }
          }
        ]
      }
    }
  }
]
}
]

问题出在 tr 对象上，它可能是对象（Object）或数组（Array）。

下面是我的代码片段：

    public class Td2
{
    [JsonProperty("@class")]
    public string TdClass { get; set; }

    [JsonProperty("@style")]
    public string style { get; set; }

    [JsonProperty("@onmouseover")]
    public string onmouseover { get; set; }

    [JsonProperty("@onmouseout")]
    public string onmouseout { get; set; }

    [JsonProperty("@onmousemove")]
    public string onmousemove { get; set; }

    [JsonProperty("#text")]
    public string text { get; set; }
}

public class Tr2
{
    public Td2 td { get; set; }
}

public class Tbody2
{
    [JsonProperty]
    [JsonConverter(typeof(ScheduleJsonConverter<Tr2>))]
    public List<Tr2> tr { get; set; }
}

public class Table
{
    [JsonProperty("@cellspacing")]
    public string cellspacing { get; set; }

    public Tbody2 tbody { get; set; }

    [JsonProperty("@class")]
    public string tClass { get; set; }
}

- DreamNet

包括一个相关的代码片段（和/或突出显示）“不一致性”。不要让它变得困难。 - user2864740

我猜这个人在处理 Tr 元素时遇到了问题。在 JSON 中，它显示为单个对象。然而，一个表可以有多行。 - kmacdonald

如果您查看Json片段和下面的文本“问题出在tr对象上，它可能是对象或数组。”，您会发现这并不难 ;) - DreamNet

1个回答

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原文链接

- kmacdonald · Accepted Answer

我从某个地方得到了这个转换器，它在我的一个项目中使用。我很想给出信用。我会尝试搜索这篇文章。然而，这应该可以解决你的问题。

编辑：啊哈，找到了：JSON.NET 反序列化对象数组中的对象将此属性添加到可能是单个对象或对象数组的类中，如下所示：

public class Tbody2
{
     [JsonProperty]
     [JsonConverter(typeof (ObjectToArrayConverter<Tr2>))]
     public List<Tr2> tr { get; set; }
 }

如果JSON只有一个元素而不是数组，转换器将使用单个元素填充数组。否则，它将反序列化为列表。

public class ObjectToArrayConverter<T> : CustomCreationConverter<List<T>> where T : new()
{
    public override List<T> Create(Type objectType)
    {
        return new List<T>();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        var target = new List<T>();

        try
        {
            // Load JObject from stream
            var jArray = JArray.Load(reader);

            // Populate the object properties
            serializer.Populate(jArray.CreateReader(), target);
        }
        catch (JsonReaderException)
        {
            // Handle case when object is not an array...

            // Load JObject from stream
            var jObject = JObject.Load(reader);

            // Create target object based on JObject
            var t = new T();

            // Populate the object properties
            serializer.Populate(jObject.CreateReader(), t);

            target.Add(t);
        }

        return target;
    }
}