c#5.0 Asynchronous Programming

The BeginInvoke implementation of the delegate is asynchronous

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Threading;namespaceconsoleapplication1{ Public Delegate intMyDelegate (intx); classProgram {Static voidMain (string[] args) {MyDelegate del=NewMyDelegate ((a) ={Console.WriteLine ("Sub Thread Begin"); Thread.Sleep ( -); return 1;            }); //delegate's BeginInvoke method implements asynchronous invocationDel. BeginInvoke (1, (a) = = {Console.WriteLine ("Sub Thread Callback"); },NULL); Console.WriteLine ("Main Thread over");        Console.read (); }    }}

Delegate's BeginInvoke

c#5.0 Async function Linear programming for asynchronous programming

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Threading;namespaceconsoleapplication1{classProgram {Static voidMain (string[] args) {Console.WriteLine ("Main Thread Begin");            MyFunc (); Console.WriteLine ("Main Thread over");        Console.read (); }        Static Async voidMyFunc () {Console.WriteLine ("MyFunc Begin"); //The program executes here to open the asynchronous task            awaitTask.run (() ={Console.WriteLine ("time-consuming operation starts"); Thread.Sleep ( -); Console.WriteLine ("time-consuming operation ends");            }); Console.WriteLine ("MyFunc over"); }    }}

c#5.0 Asynchronous Functions

c#5.0 Async Function Wrapping Method

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Threading;namespaceconsoleapplication1{classProgram {Static voidMain (string[] args) {Console.WriteLine ("Main Thread Begin"); NewTestClass ().            Displayresult (); Console.WriteLine ("Main Thread over");        Console.read (); }    }    classTestClass { Public Async voidDisplayresult () {Console.WriteLine ("time-consuming operation starts"); //asynchronously calling a function encapsulated as a task in an asynchronous function            intres =awaitGetresultasync (2);            Console.WriteLine (RES); Console.WriteLine ("time-consuming operation ends"); }        //encapsulating time-consuming operations into a task function         Publictask<int> Getresultasync (intN) {returnTask.run (() ={Thread.Sleep ( the); returnn +1;        }); }    }}

c#5.0 Asynchronous Functions

Encapsulating functions Asynchronous execution

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Threading;namespaceconsoleapplication1{classProgram {Static voidMain (string[] args) {Console.WriteLine ("Main Thread Begin"); Taskasynchelper.runasync (Newfunc<int,int> (MyFunc),Newaction<int> (Displayresult),2); Console.WriteLine ("Main Thread over");        Console.read (); }        Static intMyFunc (inti) {Console.WriteLine ("time-consuming operation starts"); Thread.Sleep ( the); returni +Ten; }        Static voidDisplayresult (inti) {Console.WriteLine ("The result is:"+i); Console.WriteLine ("time-consuming operation ends"); }    }    //encapsulates a common function that executes asynchronously after passing in a function and after a callback function     Public Static classTaskasynchelper { Public Static Async voidRunasync<tresult> (func<int, tresult> function, Action<tresult> callback,intnum) {            //encapsulates an incoming function as a taskFunc<task<tresult>> Taskfunc = () =            {                returnTask.run (() =                {                    returnfunction (num);            });            }; //asynchronously executes a encapsulated taskTResult res =awaitTaskfunc (); if(Callback! =NULL) {callback (res); }        }    }}

encapsulates an incoming function as an asynchronous execution

Semaphore control Number of threads

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Threading;namespaceconsoleapplication1{classProgram {//declares the semaphore, indicating that the maximum number of threads in the same resource is 3        StaticSemaphoreslim Semlim =NewSemaphoreslim (3); Static voidMain (string[] args) {Console.WriteLine ("Main Thread Begin");  for(inti =0; I < -; i++)            {                NewThread (semaphoretest).            Start (); } Console.WriteLine ("Main Thread over");        Console.read (); }        Static voidsemaphoretest () {semlim.wait ();//blocks the current thread until the semaphore is releasedConsole.WriteLine ("Threads"+thread.currentthread.managedthreadid.tostring () +"execution Start ..."); Thread.Sleep ( -); Console.WriteLine ("Threads"+ Thread.CurrentThread.ManagedThreadId.ToString () +"end of execution ..."); Semlim.release ();//release Semaphore        }    }}

semaphore control Number of threads

c#5.0 Asynchronous Programming