Json.Net，如何使用"Z"而不是+00:00序列化DateTimeOffset，但保留其他时区偏移量? [英] Json.Net, how to serialize DateTimeOffset with 'Z' instead of +00:00, but keep other timezone offsets?

问题描述

使用.NET Core和Json.NET，我如何序列化 DateTimeOffset (而不是 DateTime )，以使UTC +00:00 变为 Z ，同时保留其他任何时区偏移量(例如 -04:00 )?

With .NET Core and Json.NET, how can I serialize a DateTimeOffset (not DateTime) so that the UTC +00:00 becomes Z while keeping any other timezone offset (-04:00 for example)?

此SO帖子用于 DateTime ，但是我设法用它替换了将所有时区转换为UTC时 Z 的 +00:00

This SO post is for DateTime, but with it, I managed to replace the +00:00 by Z while converting all timezones to UTC

new JsonSerializerSettings {
    Converters = new JsonConverter[] {
        new IsoDateTimeConverter {
            DateTimeStyles = DateTimeStyles.AdjustToUniversal,
            DateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'",
        }
    }
};

我想保留时区偏移信息，即

I'd like to retain the timezone offset info, i.e.

2019-12-10T17:00:00Z for new DateTimeOffset(2019，12，10，17，0，0，TimeSpan.Zero)

和

2019-12-10T13:00:00-04:00 for new DateTimeOffset(2019，12，10，13，0，0，TimeSpan.FromHours(-4))

DateTimeFormat ="yyyy'-'MM'-'dd'T'HH':'mm':'ssK" 建议用于 DateTime ，但输出 +00:00 ，而不是 Z ，用于 DateTimeOffset ...

The DateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssK" suggested works for DateTime but outputs +00:00, not Z, for DateTimeOffset...

请参见此.NET小提琴，以复制我的尝试.

推荐答案

您可以子类化

You could subclass IsoDateTimeConverter and override CanConvert to only convert objects of type DateTimeOffset and DateTimeOffset?. Then, when DateTimeOffset.Offset is zero, output as a DateTime in universal format:

public class IsoDateTimeOffsetConverter : IsoDateTimeConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(DateTimeOffset) || objectType == typeof(DateTimeOffset?);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var dateTimeOffset = (DateTimeOffset)value;
        if (dateTimeOffset.Offset == TimeSpan.Zero)
        {
            // If there is no offset, serialize as a DateTime
            base.WriteJson(writer, dateTimeOffset.UtcDateTime, serializer);
        }
        else
        {
            base.WriteJson(writer, value, serializer);
        }
    }       
}

然后像这样使用它:

var settings = new JsonSerializerSettings {
    Converters = {
        new IsoDateTimeOffsetConverter(),
    }
};

演示小提琴此处.

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