如何使用 System.Text.Json.JsonSerializer 将 TimeSpan 序列化为“HH:mm:ss”

Question

我需要序列化一个具有 TimeSpan 属性的对象，并且我需要将该属性序列化为“HH:mm:ss”。相反，我得到以下信息：

{"Ticks":561342005619,"Days":0,"Hours":15,"Milliseconds":200,"Minutes":35,"Seconds":34,"TotalDays":0.6497013953923612,"TotalHours":15.592833489416666,"TotalMilliseconds":56134200.5619,"TotalMinutes":935.570009365,"TotalSeconds":56134.2005619}

有没有办法做到这一点？

Answer 1

您可以定义自己的转换器，如How to write custom converters for JSON serialization (marshalling) in .NET 中所述。您的转换器可能如下所示：

public class TimeSpanJsonConverter : JsonConverter<TimeSpan>
{
    public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        return TimeSpan.ParseExact(reader.GetString() ?? "", @"hh\:mm\:ss", CultureInfo.InvariantCulture);
    }

    public override void Write(Utf8JsonWriter writer, TimeSpan timeSpanValue, JsonSerializerOptions options)
    {
        writer.WriteStringValue(timeSpanValue.ToString(@"hh\:mm\:ss"));
    }
}

然后可以用于序列化和反序列化：

JsonSerializerOptions serializeOptions = new JsonSerializerOptions
{
    Converters =
    {
        new TimeSpanJsonConverter()
    }
};
string serializedString = JsonSerializer.Serialize(
    objectToSerialize, serializeOptions);
MyObject? deserializedObject = JsonSerializer.Deserialize<MyObject>(
    serializedString, serializeOptions);