We have written a generic class NameObjectCollection(Of T) that inherits
from NameObjectCollectionBase and implements IXmlSerializable.  We have an
interface class IBaseCondition and several classes that implement
IBaseCondition (StringCondition, NumericCondition, etc.).  We have another
class (SearchCriteria) that has a property (Conditions) which is defined as
Public ReadOnly Property Conditions() As NameObjectCollection(Of
IBaseCondition).

When we use return this SearchCriteria class from a web service, we get an
exception stating "System.NotSupportedException: Cannot serialize interface
IBaseCondition.".

Is there any way I can get this to work?  We must be able to serialize the
IBaseCondition since the NameObjectCollection is a collection of
IBaseCondition.

Thanks,

Mythran

Show quote Hide quote Then you need to make IBaseCondition inherit IXmlSerializable.

Mike

Show quote Hide quote I ended up implementing IXmlSerializable in NameObjectCollection(Of T) and
SearchCriteria.  We have numerous classes that implement IBaseCondition and
it would be a headache to add new ones and update the existing ones just for
serialization.  So far, it looks like the everything is
serialized/deserialized correctly (I have printed the serialized object as a
string and it looks correct, then took the string and deserialized and the
values of the objects come out correct too).

Thanks,
Mythran

Hi Mythran,

Since the XmlSerializer requires a concrete class to instantiate when
deserializing, there is not much options with the current design (a
collection of an interface type).

You may consider based on current implementation, let the classes that
implements the IBaseCondition to do the actual work generating XML during
serialization and instances during deserialization, and in the
NameObjectCollection's IXmlSerializable implementation, call those
individual classes' method to return the XML or instances.

Best regards.

Jie Wang

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""Jie Wang [MSFT]"" <jie***@online.microsoft.com> wrote in message
Show quoteHide quoteThanks for your response,

What I ended up doing was implementing IXmlSerializer on the collection
class itself.  During serialization, I loop through and serialize each item
in the collection, creating an XmlSerializer for each iteration based on the
type of the object stored in the collection.  So far, this works great.

Thanks,
Mythran

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