How to properly XML-serialize collections with an extensible object hierarchy in .NET?

I think you are going to have to look at XmlAttributeOverrides which lets you supply the attributes at runtime. This is not trivial but not mind-melting either. The biggest catch: when you use the constructor that accepts XmlAttributeOverrides an assembly is generated every time so be sure to cache and re-use the XmlSerializer instance - otherwise you will leak assemblies (they can't be collected).

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