. NET implements parallelism through Async/await

If parallelism can greatly improve performance, but in our use, it is not all parallel and wired line operation, so we need to do parallel operation in the business logic layer of the Protection exhibition:

The data access layer is unchanged or the same as before:

     Public classUserdal { PublicUser GetUser () {User User=NewUser (); User. Name="N1"; User. Address="A1"; returnuser; }         PublicList<user>getuserlist () {List<User> list =NewList<user>(); List. ADD (NewUser {Name ="N11", Address ="A11" }); List. ADD (NewUser {Name ="N12", Address ="A12" }); returnlist; }    }

The business logic layer needs to have async in the protection exhibition, as follows:

     Public classuserbll {userdal dal=NewUserdal ();  Public AsyncTask<user>Getuserasync () {return awaitTask.run (() = {returndal. GetUser ();        }); }         PublicUser GetUser () {returndal.        GetUser (); }         Public AsyncTask<list<user>>Getuserlistasync () {return awaitTask.run (() = {returndal. Getuserlist ();        }); }         PublicList<user>getuserlist () {returndal.        Getuserlist (); }    }

The last is called, as follows:

 USERBLL USERBLL =  USERBLL ();  public  async  task<  Actionresult> Index () { var             User = Userbll.getuserasync ();  var  listuser = Userbll.getuserlistasync            ();             int  t1 = Environment.tickcount;             await   Task.whenall (user, listuser); Viewbag.user  = User.            Result; Viewbag.listuser  = Listuser.result;  

Viewbag.user = await User;
Viewbag.listuser = await listuser;

            = Environment.tickcount- t1;             return View ();        }

Specific performance we can test, in the data access layer each time delay 500 milliseconds, with parallel and line line test, parallel about the time of about 500 milliseconds, and the line is about 1000 milliseconds

The above reference Dudu practical case: Implementing parallel http://www.cnblogs.com/dudu/p/async_await_parallel.html in existing code through ASYNC/AWAIT

. NET implements parallelism through Async/await