/// <summary>创建在线</summary>
/// <param name="sessionid"></param>
/// <returns></returns>
protected override IOnline CreateOnline(Int32 sessionid)
{
var ns = Session as NetSession;
var olt = UserOnline.FindBySessionID(sessionid) ?? new UserOnline();
olt.Version = Version;
olt.ExternalUri = ns.Remote + "";
return(olt);
}