时间戳

首页 > 解决方案 > 反序列化字符串编码的 JSON

c# - 反序列化字符串编码的 JSON

问题描述

有没有办法正确反序列化以双引号开头和结尾的 JSON 字符串？

数据以流的形式传入（来自 AWS S3 对象）。这是流的内容（注意开头和结尾的双引号字符）：

"[{\"startTime\":1610396717400,\"eventCode\":44,\"eventParam\":5},{\"startTime\":1610396717700,\"eventCode\":81,\"eventParam\":56},{\"startTime\":1610396717800,\"eventCode\":44,\"eventParam\":4}]"

JsonSerializer 似乎没有正确反序列化它。但是，对于以下内容，它按预期工作：

[{"startTime":1610396717400,"eventCode":44,"eventParam":5},{"startTime":1610396717700,"eventCode":81,"eventParam":56}]

这是片段：

public class ControllerEventJson
{
    [JsonProperty("startTime")]
    public long StartTime { get; set; }

    [JsonProperty("eventCode")]
    public int EventCode { get; set; }

    [JsonProperty("eventParam")]
    public int EventParam { get; set; }
}


class Program
{
    static void Main(string[] args)
    {
        // stream is a MemoryStream
        using (StreamReader sr = new StreamReader(stream))
        using (JsonTextReader reader = new JsonTextReader(sr))
        {
            // Required for large JSON objects to avoid errors when streaming
            reader.SupportMultipleContent = true;

            JsonSerializer serializer = new JsonSerializer();
            while (reader.Read())
            {
                // Deserialize each object in array individually
                if (reader.TokenType == JsonToken.StartObject)
                {
                    var obj = serializer.Deserialize<ControllerEventJson>(reader);
                    // Do something with obj
                }
            }
        }
    }
}

标签： c#json.net

解决方案

你可以试试这个。这已经在 Visual Studio 中测试过并且可以正常工作

Dictionary<string, string> items = null;
var list = new List<Dictionary<string, string>>();
    ...... your code
    using (JsonTextReader reader = new JsonTextReader(sr))
    {
        reader.SupportMultipleContent = true;

        Item item = null;
        while (reader.Read())
        {
            switch (reader.TokenType)
            {
                case JsonToken.StartArray:
                 items = new Dictionary<string, string>();
                    continue;

                case JsonToken.StartObject:
                    item = new Item();
                    break;

                case JsonToken.PropertyName:
                    item.Key = reader.Value.ToString();
                    break;

                case JsonToken.EndObject:
                    list.Add(items);
                    items = new Dictionary<string, string>();
                    break;

                case JsonToken.Integer:
                    item.Value = reader.Value.ToString();
                    if (item != null) items.Add(item.Key, item.Value);
                    item = new Item();
                    break;
            }
        }
    }

    var json = JsonConvert.SerializeObject(list);
    var jd = JsonConvert.DeserializeObject(json, typeof( List<ControllerEventJson>));

结果

[
  {
    "startTime": 1610396717400,
    "eventCode": 44,
    "eventParam": 5
  },
  {
    "startTime": 1610396717700,
    "eventCode": 81,
    "eventParam": 56
  },
  {
    "startTime": 1610396717800,
    "eventCode": 44,
    "eventParam": 4
  }
]

班级

public class Item
{
    public string Key { get; set; }
    public string Value { get; set; }
}

推荐阅读