/// <summary>
/// Throws <see cref="NotFoundException"/> if the item with the specified <paramref name="id"/> doesn't exist.
/// </summary>
public static async Task ThrowIfDoesNotExistAsync <TItem, TItemId>(this IIdentityStorage <TItem, TItemId> storage,
TItemId id) where TItem : class
{
bool itemExists = await storage.Exists(id)
.ConfigureAwait(false);
if (!itemExists)
{
throw new NotFoundException(typeof(TItem).Name, id);
}
}