>Because of how the base generic types are defined:

Public Overridable Function CanBuildChannelFactory(Of TChannel) ( _
>	context As BindingContext _
>) As Boolean

Public Overridable Function BuildChannelListener(Of TChannel As {Class, IChannel}) ( _
>	listenUriBaseAddress As Uri, _
>	ParamArray parameters As Object() _
>) As IChannelListener(Of TChannel)

>http://msdn.microsoft.com/en-us/library/ms405436(v=vs.110).aspx
>http://msdn.microsoft.com/en-us/library/ms405443(v=vs.110).aspx

Thanks, that is very useful.

With that reference, I was able to complete the last one, which also requires the addition of As Class in the Public line:

    Public Overrides Function GetProperty(Of T As Class)(context As System.ServiceModel.Channels.BindingContext) As T
        If GetType(T) = GetType(System.Xml.XmlDictionaryReaderQuotas) Then
            Return DirectCast(DirectCast(m_readerQuotas, Object), T)
        Else
            Return MyBase.GetProperty(Of T)(context)
        End If
    End Function

I just do not understand why the examples I got from the net did not have that. Or, maybe it is the C# to VB.NET converter which did not take care of that.