/// <summary>Returns true if a user is in the role</summary>
/// <param name="user">用户实体</param>
/// <param name="roleName"></param>
/// <returns></returns>
public Task <bool> IsInRoleAsync(TUser user, string roleName, CancellationToken cancellationToken)
{
if (user == null)
{
throw new ArgumentNullException("user");
}
if (string.IsNullOrEmpty(roleName))
{
throw new ArgumentNullException("roleName");
}
return(TaskHelper.RunTask(() =>
{
var userId = user.Id;
return _objectStorage.Any <UserRole>(p => p.UserId == userId && p.RoleName == roleName);
}));
}