.NET Framework Exporting a Type (Basic)

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using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel.Composition;

namespace Demo
    public sealed class UserProvider : IUserProvider
        public ReadOnlyCollection<User> GetAllUsers()
            return new List<User>
                new User(0, "admin"),
                new User(1, "Dennis"),
                new User(2, "Samantha"),

This could be defined virtually anywhere; all that matters is that the application knows where to look for it (via the ComposablePartCatalogs it creates).

Importing (Basic)