如何反序列化复杂的 JSON 并将其创建为 C# 对象

Question

我有一个 JSON，如下所示：

{
    "Values": [
        {
            "MsgSource": null,
            "TagName": "Data.New_MSG",
            "RawValue": "[\r\n  {\r\n    \"ID\": 145,\r\n    \"StationNo\": 6,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 2,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T23:30:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 144,\r\n    \"StationNo\": 18,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 5,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:00:00\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 143,\r\n    \"StationNo\": 15,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 4,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:00:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 142,\r\n    \"StationNo\": 19,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 5,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:30:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  }\r\n]",
            "ScaledValue": "[\r\n  {\r\n    \"ID\": 145,\r\n    \"StationNo\": 6,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 2,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T23:30:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 144,\r\n    \"StationNo\": 18,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 5,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:00:00\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 143,\r\n    \"StationNo\": 15,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 4,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:00:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  },\r\n  {\r\n    \"ID\": 142,\r\n    \"StationNo\": 19,\r\n    \"RunTime\": 1800,\r\n    \"ControllerID\": 4,\r\n    \"ControllerAddress\": 2,\r\n    \"ProgramNo\": 5,\r\n    \"ModeID\": \"AutoProgram\",\r\n    \"EventDate\": \"2022-04-27T22:30:02\",\r\n    \"Description\": \"Irrigation Completed\",\r\n    \"MessageCode\": 5\r\n  }\r\n]",
            "Status": "Normal",
            "ComStatus": null,
            "TimeStamp": "2022-04-28 13:17:39.851"
        }
    ]
}

如何反序列化此 JSON 并创建一个仅包含 RawValue 内部值的列表，其中每个有效负载将充当列表中的单个元素。另外，如何从列表中的每个元素中删除不需要的 \r\n 和转义字符。

Answer 1

基本上，您已经获得了包含 JSON 的 JSON - 所以您应该期望必须反序列化一次。（诚​​然，如果您可以更改 JSON 的结构以避免这种双重序列化，那就更好了，但我假设这是固定的。）

例如，您可以：

public class Root
{
    public List<Value> Values { get; set; }
}

public class Value
{
    // Add other properties if you need them
    public string RawValue { get; set; }
}

然后：

public class Root
{
    public List<Value> Values { get; set; }
}

public class Value
{
    // Add other properties if you need them
    public string RawValue { get; set; }
}

假设您很乐意将JArray/JObject用于“嵌入”对象。如果您也想对它们进行建模，您将拥有：

string json = ...;
Root root = JsonConvert.DeserializeObject<Root>(json);
// This just takes the first value - we don't know whether you actually
// ever have more than one...
string rawValue = root.Values[0].RawValue;
JArray array = JArray.Parse(rawValue);

...然后进行反序列化：

public class Station
{
    [JsonProperty("ID")]
    public int Id { get; set; }
    public int StationNo { get; set; }
    // etc
}

当您反序列化两次时，不应该有任何“额外”转义。