public async Task <IdentityResult> UpdateRolesAsync(string userName, string[] roles)
{
var user = await _user.FindAsync(u => u.UserName == userName);
var assignedRoles = user.SsuserRole.Select(r => r.Role.Name);
var rolesToAdd = roles.Except(assignedRoles);
var rolesToRemove = assignedRoles.Except(roles);
var result = new IdentityResult();
if (rolesToAdd != null && rolesToAdd.Any())
{
result = await _user.AddRolesToUserAsync(user, rolesToAdd);
}
if (!result.Succeeded)
{
return(result);
}
if (rolesToRemove != null && rolesToRemove.Any())
{
result = await _user.RemoveRolesFromUserAsync(user, rolesToRemove);
}
return(result);
}