// http://patrickdesjardins.com/blog/validation-failed-for-one-or-more-entities-see-entityvalidationerrors-property-for-more-details-2
// ((System.Data.Entity.Validation.DbEntityValidationException)$exception).EntityValidationErrors
#endregion
#region 在线用户相关
protected void UpdateOnlineUser(string username)
{
DateTime now = DateTime.Now;
object lastUpdateTime = Session[SK_ONLINE_UPDATE_TIME];
if (lastUpdateTime == null || (Convert.ToDateTime(lastUpdateTime).Subtract(now).TotalMinutes > 5))
{
// 记录本次更新时间
Session[SK_ONLINE_UPDATE_TIME] = now;
Online online = DB.Onlines.Where(o => o.User.Name == username).FirstOrDefault();
if (online != null)
{
online.UpdateTime = now;
DB.SaveChanges();
}
}
}
protected void RegisterOnlineUser(User user)
{
Online online = DB.Onlines.Where(o => o.User.ID == user.ID).FirstOrDefault();
// 如果不存在，就创建一条新的记录
if (online == null)
{
online = new Online();
DB.Onlines.Add(online);
}
DateTime now = DateTime.Now;
online.User = user;
online.IPAdddress = Request.UserHostAddress;
online.LoginTime = now;
online.UpdateTime = now;
DB.SaveChanges();
// 记录本次更新时间
Session[SK_ONLINE_UPDATE_TIME] = now;
}