Question

我有以下使用Json.net的代码：

class HistorianRecord
{
    public string tagname { get; set; }
    public string engunits { get; set; }
    public string value { get; set; }
    public string quality { get; set; }
    public DateTime timestamp { get; set; }
}

private static void createJSONFile(DataTable dt)
{
    var HistorianData = new List<HistorianRecord>();

    foreach(DataRow row in dt.Rows)
    {
        HistorianData.Add(new HistorianRecord()
        {
            tagname = row["tagname"].ToString(),
            engunits = row["engunits"].ToString(),
            value =  row["value"].ToString(),
            quality = row["quality"].ToString(),
            timestamp = DateTime.Parse(row["timestamp"].ToString())
        });
    }

    var serializer = new JavaScriptSerializer();
    var serializedResult = serializer.Serialize(HistorianData);
    var deserializedResult = serializer.Deserialize<List<HistorianRecord>>(serializedResult);

    File.WriteAllText(folderPath + fileName, JsonConvert.SerializeObject(deserializedResult));
}

哪个会生成以下JSON文件，我在本文中将其简化为datatable中的> 1000行：

[
  {
    "tagname": "mytag1",
    "engunits": "",
    "value": "2",
    "quality": "Good NonSpecific",
    "timestamp": "2018-12-13T10:45:05Z"
  },
  {
    "tagname": "myTag2",
    "engunits": "",
    "value": "0",
    "quality": "Good NonSpecific",
    "timestamp": "2018-12-13T10:45:00Z"
  }
]

我想将代码修改为，以便可以在JSON文件的开头添加一些项目，使其看起来更像这样：

[
  {
    "name": "ARandomName",
    "content": [
      {
        "tagname": "mytag1",
        "engunits": "",
        "value": "2",
        "quality": "Good NonSpecific",
        "timestamp": "2018-12-13T10:45:05Z"
      },
      {
        "tagname": "myTag2",
        "engunits": "",
        "value": "0",
        "quality": "Good NonSpecific",
        "timestamp": "2018-12-13T10:45:00Z"
      }
    ]
  }
]

因此，我可以为我正在调查的MongoDB测试安装创建一些文档，以感谢所有帮助。

Answer 1

您只需将HistorianRecords的反序列化列表包装在一个匿名对象中并对其进行重新序列化：

var anon = new 
{
    name = "ARandomName",
    content = deserializedResult 
};

string newJson = JsonConvert.SerializeObject(anon, Formatting.Indented);

提琴：https://dotnetfiddle.net/6kSvxS

Json.net附加JSON文件

1 个答案: