public async Task <bool> Handle(Command request, CancellationToken cancellationToken)
{
User user = await _userManager.Users
.Include(u => u.Person)
.SingleOrDefaultAsync(u => u.NormalizedUserName == _userManager.NormalizeName(request.Username), cancellationToken);
IList <string> currentRoles = await _userManager.GetRolesAsync(user);
var isNewUser = currentRoles.Count == 0;
if (!isNewUser)
{
await _userManager.RemoveFromRolesAsync(user, currentRoles);
}
await _userManager.AddToRolesAsync(user, request.RoleNames);
return(isNewUser);
}