How to set the StreamingContext for DataContractSerializer?

Question

I have some code something like this:

[DataContract]
class Foo {
    [OnSerializing]
    private void BeforeSerialize(StreamingContext ctx)
    {
        ((MtType)ctx.Context).DoStuff()
    }

    ...
}

var reader = new XmlTextReader(filename);
var serializer = new DataContractSerializer(typeof(Type));
Type type = (Type)serializer.ReadObject(reader);

and I need to provide the StreamingContext structure. I have found several references that this can be done for NetDataContractSerializer but none for DataContractSerializer.

• Is there a way to make this work?
• Am I just doing this wrong?