Parsing ISO Duration with JSON.Net

问题:

I have a Web API project with the following settings in Global.asax.cs:

var serializerSettings = new JsonSerializerSettings     {         DateFormatHandling = DateFormatHandling.IsoDateFormat,          DateTimeZoneHandling = DateTimeZoneHandling.Utc     };  serializerSettings.Converters.Add(new IsoDateTimeConverter());  var jsonFormatter = new JsonMediaTypeFormatter { SerializerSettings = serializerSettings }; jsonFormatter.MediaTypeMappings.Add(GlobalConfiguration.Configuration.Formatters[0].MediaTypeMappings[0]);  GlobalConfiguration.Configuration.Formatters[0] = jsonFormatter;  WebApiConfig.Register(GlobalConfiguration.Configuration);

Despite all this, Json.Net cannot parse ISO durations.

It throws this error:

Error converting value "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z" to type 'System.TimeSpan'.

I'm using Json.Net v4.5.

I've tried different values such as "P1M" and others listed on the wiki page with no luck.

So the question is:

1. Am I missing something?
2. Or do I have to write some custom formatter?

回答1:

I ran into the same problem and am now using this custom converter to Convert .NET TimeSpans to ISO 8601 Duration strings.

public class TimeSpanConverter : JsonConverter {     public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)     {         var ts = (TimeSpan) value;         var tsString = XmlConvert.ToString(ts);         serializer.Serialize(writer, tsString);     }      public override object ReadJson(JsonReader reader, Type objectType, object existingValue,         JsonSerializer serializer)     {         if (reader.TokenType == JsonToken.Null)         {             return null;         }          var value = serializer.Deserialize(reader);         return XmlConvert.ToTimeSpan(value);     }      public override bool CanConvert(Type objectType)     {         return objectType == typeof (TimeSpan) || objectType == typeof (TimeSpan?);     } }

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