WCF中未返回DateTime.Kind

Question

When dealing with DateTime objects with WCF, returned DateTime objects are missing the Kind property, it will always be DateTimeKind.Unspecified even if I change it manually before returning it!

I did this in the WCF side:

dateFrom = DateTime.SpecifyKind(dateFrom , DateTimeKind.Utc);

still, it is sent as DateTimeKind.Unspecified to the client...

Client is WinForm application, server is WCF hosted in IIS.

PS I am aware of the DateTime.ToUniversalTime() method but that's not what I need.

Answer 1

You can find the solution in this question:

Roundtrip XML Serialization of DateTime and xsd:date?

There are different behaviors for handling Date, Time and DateTime values. For DateTime values, if XmlDateTimeSerializationMode is not Local the information about the kind (UTC, Local or Unspecified) is preserved. This is also true while deserializing. However, for Date and Time, they are always serialized out with the same format: (yyyy-MM-dd for Date and HH:mm:ss.fffffff.zzzzzz for Time). So the information about kind is lost on serializing and deserializing.