I have a common library with some objects in it. Then I have a service project that references the common library and creates some derived types from objects in the common library.
I want my service to serialize the derived types as their base types defined in the common library.
I cannot use KnownTypes on the objects in the common library because I don't want the common library referencing the service assemblies.
So how can I have wcf serialize the derived types as their base types?
I wish I could do something like...
[DataContract(SerializeAsType = typeof(BaseType))] public class DerivedType : BaseType { }
Is anything like this possible?
Are you using .NET 4.0? You can use the DataContractResolver for this if you are:
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractresolver.aspx
This is also basically what Entity Framework 4.0 does for its DataContractResolver for proxy types.
Here is an example: Link
(see DeserializeAsBaseResolver in the link).
EDIT: If you're not using .NET 4.0, I think your next best option is a DataContractSurrogate: http://msdn.microsoft.com/en-us/library/system.runtime.serialization.idatacontractsurrogate.aspx. ...so you can control the serialization by hand, but this can get messy.
Both are passed into the constructor of your DataContractSerializer and can be configured for WCF via the DataContractSerializerOperationBehavior: http://msdn.microsoft.com/en-us/library/system.servicemodel.description.datacontractserializeroperationbehavior.aspx.