c# - 将 json 数组转换为数据表 asp.net

Question

拜托，我对 json 很陌生。我有一个 url，我传递值并且返回的数据采用 json 格式。我需要反序列化此 url 中的 json，然后将其绑定(bind)到 asp.net 中的 ListView 控件。这就是 json 数据的样子。

   {"records":[{"record":{"Ch_ID":"27","User_id":"1","Ch_Name":"test1","Ch_Description":"test1description","Ch_Starttime":""}},{"record":{"Ch_ID":"29","User_id":"1","Ch_Name":"w","Ch_Description":"ww","Ch_Starttime":"12"}},{"record":{"Ch_ID":"30","User_id":"1","Ch_Name":"qq","Ch_Description":"qqqdescription","Ch_Starttime":"1222"}},{"record":{"Ch_ID":"31","User_id":"1","Ch_Name":"v","Ch_Description":"vv","Ch_Starttime":"1"}},{"record":{"Ch_ID":"32","User_id":"1","Ch_Name":"n","Ch_Description":"nnnn","Ch_Starttime":"111"}}]} 

有谁知道我该如何做到这一点。我已经尝试过 json.net 但它给了我错误。

Answer 1

Json.NET 确实支持通过其内置的 DataTableConverter 反序列化 DataTable ，但是它希望将 JSON 格式化为数组，如下所示:

[
  {
    "Ch_ID": "27",
    "User_id": "1",
    // Other fields
  },
  {
    "Ch_ID": "29",
    "User_id": "1",
    // Other fields
  },
  // Other records
]

您的 JSON 的格式如下:

{
  "records": [
    {
      "record": {
        "Ch_ID": "27",
        "User_id": "1",
        // Other fields
      }
    },
    {
      "record": {
        "Ch_ID": "29",
        "User_id": "1",
        // Other fields
      }
    },
    // Other records
  ]
}

您可以使用 custom JsonConverter 将实际的 JSON 转换为 Json.NET 所需的格式。 :

public class RecordDataTableConverter : Newtonsoft.Json.Converters.DataTableConverter
{
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
            return null;
        if (reader.TokenType == JsonToken.StartObject)
        {
            var token = JToken.Load(reader);
            token = new JArray(token.SelectTokens("records[*].record"));
            using (var subReader = token.CreateReader())
            {
                while (subReader.TokenType == JsonToken.None)
                    subReader.Read();
                return base.ReadJson(subReader, objectType, existingValue, serializer); // Use base class to convert
            }
        }
        else
        {
            return base.ReadJson(reader, objectType, existingValue, serializer);
        }
    }
}

并按如下方式使用它:

var json = GetJson();

var settings = new JsonSerializerSettings
{
    Converters = new[] { new RecordDataTableConverter() },
};

var table = JsonConvert.DeserializeObject<DataTable>(json, settings);

样本fiddle .