.net - DataContractSerializer, KnownType and inheritance -

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I have read many articles about known types and I should consider my example that work should be done. But this is not me getting the following exception on deserialization and I do not understand why:

Error in line 1 position 2. Except 'A' from the namespace, "name", "namespace". 

  using the system; Use the system. time. Timeliness; Using System.Xml; Using System.IO; Namespace Console Application 2 [[Detacontrkt] [known type (Taipf (c)) class A {} [Detacontrkt] Class C: A {} class Program {[static void main (String] ARG) {A a = new C () ; String data; Var Serializer = New Data Contrast Cylizer (a.GetType ()); (Var sw = new stringwriter ()) using ({var xw = new XmlTextWriter (sw)) serializer.WriteObject (xw, A); Data = sw.ToString (); } Serializer = New Data Contributorizer (Typef (A)); (Var sr = new string reader (using data)) (var xr = new XmlTextReader (sr)) a = (A) serializer.ReadObject (xr); }}}

What am I missing?

Change the way you create the serializer: 

  Var serializer = new datasetricetricularizer (typef (A));

instead of a.GetType ();

This works which XML is generated is different - something like this: 

  & lt; C & gt; ...

And now it is: 

  & lt; A i: type = "c" & gt; ...

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