我可以读取具有不同名称的JSON属性到我的类与JSON.Net上的特定属性

Question

我有一个恼人的难题，我有多个类型从API返回，它们之间的唯一区别是属性名称。一种类型的int值为Count，另一种类型的int值为Customers，还有一种类型的int值为Replies。

类的例子:

public class DateAndCount
{
    public DateTime? Date { get; set; }
    public int Count { get; set; }
}
public class DateAndCount
{
    public DateTime? Date { get; set; }
    public int Customers { get; set; }
}
public class DateAndCount
{
    public DateTime? Date { get; set; }
    public int Replies { get; set; }
}

JSON的例子:

{
  "count": 40,
  "date": "2014-01-01T00:00:00Z"
},
{
  "customers": 40,
  "date": "2014-01-01T00:00:00Z"
},
{
  "replies": 40,
  "date": "2014-01-01T00:00:00Z"
},

而不是必须创建3+几乎相同的类，我可以以某种方式让序列化器反序列化任何属性名称到Count属性?

Answer 1

您可以创建一个简单的JsonConverter来处理这个:

class DateAndCountConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return (objectType == typeof(DateAndCount));
    }
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jo = JObject.Load(reader);
        DateAndCount dac = new DateAndCount();
        dac.Date = (DateTime?)jo["Date"];
        // put the value of the first integer property from the JSON into Count
        dac.Count = (int)jo.Properties().First(p => p.Value.Type == JTokenType.Integer).Value;
        return dac;
    }
    public override bool CanWrite
    {
        get { return false; }
    }
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

要使用它，使用[JsonConverter]属性修饰DateAndCount类，将转换器绑定到您的类，并像往常一样反序列化。下面是一个示例:

class Program
{
    static void Main(string[] args)
    {
        ParseAndDump(@"{ ""Date"" : ""2015-08-22T19:02:42Z"", ""Count"" : 40 }");
        ParseAndDump(@"{ ""Date"" : ""2015-08-20T15:55:04Z"", ""Customers"" : 26 }");
        ParseAndDump(@"{ ""Date"" : ""2015-08-21T10:17:31Z"", ""Replies"" : 35 }");
    }
    private static void ParseAndDump(string json)
    {
        DateAndCount dac = JsonConvert.DeserializeObject<DateAndCount>(json);
        Console.WriteLine("Date: " + dac.Date);
        Console.WriteLine("Count: " + dac.Count);
        Console.WriteLine();
    }
}
[JsonConverter(typeof(DateAndCountConverter))]
class DateAndCount
{
    public DateTime? Date { get; set; }
    public int Count { get; set; }
}

输出:

Date: 8/22/2015 7:02:42 PM
Count: 40
Date: 8/20/2015 3:55:04 PM
Count: 26
Date: 8/21/2015 10:17:31 AM
Count: 35