public virtual async Task AddToRoleAsync(User user, string normalizedRoleName, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
Throw.IfArgumentNull(user, nameof(user));
Throw.IfArgumentNull(normalizedRoleName, nameof(normalizedRoleName));
if (await IsInRoleAsync(user, normalizedRoleName, cancellationToken))
{
return;
}
var role = await _roleProvider.FindByNormalizedRoleNameAsync(normalizedRoleName);
if (role == null)
{
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, "Role {0} does not exist!", normalizedRoleName));
}
user.Roles.Add(new UserRole(user.Id, role.Id));
}