I've created an objectdataprovider in a resource dictionary with some method parameters.

<ObjectDataProvider x:Key="PatientsList" 
                        ObjectType="{x:Type vm:AllPatientsViewModel}" 
      <system: Double>22</system:Double>      

I've having a problem getting the <system:Double> tag to be recognised. I receive the following error:

Error 1 The type 'system:Double' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

I can't seem to resolve this by adding a reference to the namespace. I thought it should be System, but this does not work.

Can anyone help please?