RegistryTItem - класс

public class Registry<TItem> : IRegistry<TItem>
where TItem : class, ITypeIdentifier

Public Class Registry(Of TItem As {Class, ITypeIdentifier})
	Implements IRegistry(Of TItem)

generic<typename TItem>
where TItem : ref class, ITypeIdentifier
public ref class Registry : IRegistry<TItem>

type Registry<'TItem when 'TItem : not struct and ITypeIdentifier> =  
    class
        interface IRegistry<'TItem>
    end