/// <summary>
 /// Registers the Entity Framework stores.
 /// </summary>
 /// <param name="builder">The services builder used by OpenIddict to register new services.</param>
 /// <returns>The <see cref="OpenIddictBuilder"/>.</returns>
 public static OpenIddictBuilder AddEntityFramework <TContext>([NotNull] this OpenIddictBuilder builder)
     where TContext : DbContext
 {
     return(builder.AddEntityFramework <TContext, string>());
 }