Imports System
Imports System.IO
Imports System.Collections
Imports System.Collections.Generic
Imports System.Runtime.Serialization
Imports ServiceStack
Imports ServiceStack.DataAnnotations
Imports Test.ServiceModel
Imports Test.ServiceModel.Types
Namespace Global
    Namespace Test.ServiceModel
        Public Partial Class HelloBase(Of T)
            Public Overridable Property Items As List(Of T) = New List(Of T)
            Public Overridable Property Counts As List(Of Integer) = New List(Of Integer)
        End Class
        Public Partial Class HelloWithGenericInheritance
            Inherits HelloBase(Of Poco)
            Public Overridable Property Result As String
        End Class
    End Namespace
    Namespace Test.ServiceModel.Types
        Public Partial Class Poco
            Public Overridable Property Name As String
        End Class
    End Namespace
End Namespace
VB.NET HelloWithGenericInheritance DTOs
To override the Content-type in your clients, use the HTTP Accept Header, append the .jsv suffix or ?format=jsv
The following are sample HTTP requests and responses. The placeholders shown need to be replaced with actual values.
POST /jsv/oneway/HelloWithGenericInheritance HTTP/1.1 
Host: test.servicestack.net 
Accept: text/jsv
Content-Type: text/jsv
Content-Length: length
{
	result: String,
	items: 
	[
		{
			name: String
		}
	],
	counts: 
	[
		0
	]
}