c# linq to sql two threads visit the same db, but one is very slow -


i've created 2 threads in application , first 1 main ui thread, normal job quering below

      var order = db.orders.where(x=>x.systemid==id).tolist();

the other thread checking if there warning situation handle, code below:

      transactionoptions transoptions = new transactionoptions()          { isolationlevel = system.transactions.isolationlevel.readuncommitted };         using (new transactionscope(transactionscopeoption.required, transoptions))         {             bathdbdatacontext dc = new bathdbdatacontext(connectionstring);             var all_menus = dc.menu.where(x => x.addautomatic);             var menus = all_menus.select(x => x.name).tolist();             var orders = dc.orders.where(x => menus.contains(x.menu) && !x.paid && x.deleteemployee == null);             var add_menus = orders.select(x => x.menu).distinct();             var ids = orders.select(x => x.systemid).distinct();             foreach (var systemid in ids)             {                 var seat_orders = orders.where(x => x.systemid == systemid);                 foreach (var add_menu in add_menus)                 {                     var add_orders = seat_orders.where(x => x.menu == add_menu && (x.pricetype == null || x.pricetype != "stop counting"));                     if (add_orders.count() == 0)                         continue;                      var max_time = add_orders.max(x => x.inputtime);                     var max_order = add_orders.orderbydescending(x => x.inputtime).firstordefault();                     //var max_order = add_orders.firstordefault(x => x.inputtime == max_time);                     if (max_order == null || max_order.pricetype == "per hour")                         continue;                      var the_menu = all_menus.firstordefault(x => x.name == add_menu);                     string menu_time = the_menu.timelimithour.tostring() +                         ":" + the_menu.timelimitminiute.tostring() +                         ":" + the_menu.timelimitsecond.tostring();                     timespan tsm = timespan.parse(menu_time);                     if (datetime.now - max_order.inputtime < tsm)                         continue;                      if (the_menu.addtype == "by unit")                     {                         orders new_order = new orders();                         new_order.menu = max_order.menu;                         new_order.text = max_order.text;                         new_order.systemid = systemid;                         new_order.number = 1;                         new_order.money = the_menu.price;                         new_order.technician = max_order.technician;                         new_order.techtype = max_order.techtype;                         new_order.inputtime = datetime.now;                         new_order.inputemployee = "computer";                         new_order.paid = false;                         dc.orders.insertonsubmit(new_order);                     }                     else if (the_menu.addtype == "by time")                     {                         orders new_order = new orders();                         new_order.menu = max_order.menu;                         new_order.text = max_order.text;                         new_order.systemid = systemid;                         new_order.number = 1;                         new_order.pricetype = "per hour";                         new_order.money = convert.todouble(the_menu.addmoney);                         new_order.technician = max_order.technician;                         new_order.techtype = max_order.techtype;                         new_order.inputtime = datetime.now;                         new_order.inputemployee = "computer";                         new_order.paid = false;                         dc.orders.insertonsubmit(new_order);                     }                 }                 dc.submitchanges();             }

in situation, query in main ui thread slow or doesn't work.

can me that?

correct me if wrong seem insert values orders in loop , trying use expression in main ui.

besides 5 seconds interval might short since linq expressions more complex time needed calculations increases.

loading "bathdbdatacontext" might take more time database gets new records. i'd suggest using cache , increase 5 seconds refresh timer.


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