使用属性定义要使用的JsonConverter

你可以定制 ContractResolver 那是你的 DataType 属性,并将值映射到相应的转换器。以下是您需要的代码:

public class DataTypeResolver : DefaultContractResolver
{
    private Dictionary<DataType, JsonConverter> ConvertersByDataType { get; set; }

    public DataTypeResolver()
    {
        // Adjust this list to match your actual data types and converters
        ConvertersByDataType = new Dictionary<DataType, JsonConverter>
        {
            { DataType.PostalCode, new PostalCodeConverter() },
            { DataType.PhoneNumber, new PhoneNumberConverter() },
        };
    }

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        JsonProperty prop = base.CreateProperty(member, memberSerialization);
        var att = prop.AttributeProvider.GetAttributes(true).OfType<DataTypeAttribute>().FirstOrDefault();
        if (att != null)
        {
            JsonConverter converter;
            if (ConvertersByDataType.TryGetValue(att.DataType, out converter))
            {
                prop.Converter = converter;
            }
        }
        return prop;
    }
}

然后将解析器传递给 SerializeObject 和/或 DeserializeObject

var settings = new JsonSerializerSettings
{
    ContractResolver = new DataTypeResolver()
};
string json = JsonConvert.SerializeObject(yourObject, settings);

https://dotnetfiddle.net/k1kWv5

您可以将转换器添加到JsonSerializerSettings。因此,与其装饰一切,不如在那里添加邮政编码JSONConverter(取决于使用频率,装饰器可能更好):

对于aspnet核心默认值:

services.AddMvc().AddJsonOptions(o => o.SerializerSettings.Converters.Add(new PostcodeJsonConverter()))

对于JsonConvert:

JsonConvert.SerializeObject(obj, new JsonSerializerSettings
{
    Converters = { new PostcodeJsonConverter() }
});