Assembly reference not resolving in the Web.config

Question

I am developing WCF service hosted by IIS. I need to add KnownType attribute to my base class. One way of adding KnownType attribute is to add a section into the Web.config file like this:

<system.runtime.serialization>
<dataContractSerializer>
  <declaredTypes>
    <add type="MyBase, MyBaseDll">
      <knownType type="MyDerived, MyDerivedDll"/>
    </add>
  </declaredTypes>
</dataContractSerializer>
</system.runtime.serialization>

But I got error message when my mouse is over the MyBase. The Error message is “Invalid Module Qualification: Failed to resolving assembly MyBaseDll”. Same error message for MyDerivedDll.

Additional information:
Both MyBaseDLL.dll and MyDerivedDLL.dll are in the IIS /bin folder. Both DLLs reference no other assembly other than .net system assemblies

Answer 1

What happens when you run the service? The error message could be bogus. For instance, ReSharper sometimes gets confused about assembly references in config files.

OTOH, other times, it's correct.

Answer 2

Have you tried giving the full name of the assemblies and full name of the types (namespaces and all) ...

<add type="MyNamespace.MyBase, 
           MyBaseDLL, Version=v.v.v.v, Culture=neutral,
           PublicKeyToken=XXXXXX">
           <knownType type="MyNamespace.MyDerived, 
                      MyDerivedDLL, Version=v.v.v.v, Culture=neutral,
                      PublicKeyToken=XXXXXX"/>
</add>