JSON.NET将DateTime.MinValue序列化为null [英] JSON.NET Serialize DateTime.MinValue as null
问题描述
我希望将由我的Web API返回的设置为DateTime.MinValue
的DateTime
字段序列化为NULL
而不是"0001-01-01T00:00:00"
.
I'd like DateTime
fields that are set to DateTime.MinValue
returned by my Web API to be serialized to NULL
instead of "0001-01-01T00:00:00"
.
我知道有一种方法可以使JSON.NET忽略设置为默认值的字段,但是我更希望JSON.NET专门序列化DateTime MinValue / "0001-01-01T00:00:00" as null
.
I understand there's a way to get JSON.NET to omit fields that are set to default values, but I would prefer JSON.NET to specifically serialize DateTime MinValue / "0001-01-01T00:00:00" as null
.
有没有办法做到这一点?
Is there a way to do this?
推荐答案
创建一个自定义转换器,将DateTime.MinValue
序列化为null
,并(如果需要)将null
反序列化为DateTime.MinValue
:
Create a custom converter which serializes DateTime.MinValue
into null
, and (if required) deserializes null
into DateTime.MinValue
:
public class MinDateTimeConverter : DateTimeConverterBase
{
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.Value == null)
return DateTime.MinValue;
return (DateTime)reader.Value;
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
DateTime dateTimeValue = (DateTime)value;
if (dateTimeValue == DateTime.MinValue)
{
writer.WriteNull();
return;
}
writer.WriteValue(value);
}
}
然后可以使用属性将转换器添加到数据类中,如本示例所示:
You can then use attributes to add the converter to your data class, as shown in this example:
public class Example
{
[JsonConverter(typeof(MinDateTimeConverter))]
public DateTime ValueOne { get; set; }
[JsonConverter(typeof(MinDateTimeConverter))]
public DateTime ValueTwo { get; set; }
}
public static void Main(string[] args)
{
Example data = new Example();
data.ValueOne = DateTime.MinValue;
data.ValueTwo = DateTime.Now;
JsonSerializer serializer = new JsonSerializer();
using (StringWriter writer = new StringWriter())
{
serializer.Serialize(writer, data);
Console.Write(writer.ToString());
}
Console.ReadKey();
}
控制台输出:
{"ValueOne":null,"ValueTwo":"2016-10-26T09:54:48.497463+01:00"}
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