How to return a List<object> in WCF

Question

I have my WCF service returning data both in XML and JSON format.

One functios has to return a List, because I don\'t know which class will be used to fill this list

Answer 1

You could define

[KnownType(typeof(MyChildObject0))]
...
[KnownType(typeof(MyChildObjectM))]
public class MyBaseObject { ... }

public class MyChildObject0 : MyBaseObject { ... }
...
public class MyChildObjectM : MyBaseObject { ... }

Or you could add the attribute only once and define static method that returns all M+1 types at once.

and modify:

public class WrapHome
{
  ...
  public List CHART { get;set; }
}