c# - newtonsoft.json 反序列化逻辑

Question

我正在尝试在反序列化过程中将带有例如 [1,2,3] 的 json 字符串解析为数组。

这是我的 json 数据:

[
    {
        "id": "1",
        "district": "1",
        "lon": "4.420650000000000000",
        "lat": "51.21782000000000000",
        "bikes": "19",
        "slots": "14",
        "zip": "2018",
        "address": "Koningin Astridplein",
        "addressNumber": null,
        "nearbyStations": "3,4,5,24",
        "status": "OPN",
        "name": "001- Centraal Station - Astrid"
    }
]

这是我的 C# 当前映射到一个常规字符串，我希望它是一个整数数组。

var AvailabilityMap = new[] { new Station() };
var data = JsonConvert.DeserializeAnonymousType(json, AvailabilityMap);

public class Station
{
    public int Id { get; set; }
    public double Lon { get; set; }
    public double Lat { get; set; }
    public int Bikes { get; set; }
    public int Slots { get; set; }
    public string Address { get; set; }
    public string NearbyStations { get; set; }
    public string Status { get; set; }
    public string Name { get; set; }
}

到目前为止，我还没有找到正确的方法来执行此操作，而无需再次遍历我当前的数组..

Answer 1

创建自定义转换器。像这样:

public class StringToIntEnumerable : JsonConverter
{

    public override bool CanConvert(Type objectType)
    {
        throw new NotImplementedException();
    }

    public override bool CanWrite
    {
        get
        {
            return false;    // we'll stick to read-only. If you want to be able 
                             // to write it isn't that much harder to do.
        }
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        // Note: I've skipped over a lot of error checking and trapping here
        // but you might want to add some
        var str = reader.Value.ToString();
        return str.Split(',').Select(s => int.Parse(s));
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

现在更改类以使用 JsonConverterAttribute 来使用转换器:

public class Station
{
    public int Id { get; set; }
    public double Lon { get; set; }
    public double Lat { get; set; }
    public int Bikes { get; set; }
    public int Slots { get; set; }
    public string Address { get; set; }
    [JsonConverter(typeof(StringToIntEnumerable))]
    public IEnumerable<int> NearbyStations { get; set; }  // or List<int> or int[] if 
                                                          // you prefer, just make 
                                                          // sure the convert returns 
                                                          // the same type
    public string Status { get; set; }
    public string Name { get; set; }
}

现在反序列化:

var stations = JsonConvert.DeserializeObject<List<Station>>(json);