Quantcast
Channel: CSharp Forum Latest Questions
Viewing all articles
Browse latest Browse all 32065

WPF multitasking along with a timer and background worker

$
0
0
Few days ago I started using tasks in my WPF application for parallelization purposes. My application needs to perform some work every 5 seconds. This work has to be parallelized by 4 tasks. And in addition to that the background worker needs to be implemented in order to avoid freezing of UI while doing the work by tasks. I found lots of examples to understand how tasks work. However, I couldn't find any simple examples to understand how tasks work along with timers, background worker and locks of course. I wrote some simple example to show you how I understood. Please, give me advises whether I do it correctly. By this way I will have better understanding in multitasking in WPF. I'm looking forward to your replies.


namespace timer_and_thread {
/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>
publicpartialclassMainWindow:Window
{

DispatcherTimerTimerObject;
Task[] tasks;

readonlyobject _countLock =newobject();

int[]Summ=newint[10];

intIndex=0;

publicMainWindow()

{

InitializeComponent();

TimerObject=newDispatcherTimer();

TimerObject.Tick+=newEventHandler(timer_Elapsed);

TimerObject.Interval=newTimeSpan(0,0,5);

}// call the method every 5 seconds

privatevoid timer_Elapsed(object sender,EventArgs e)

{

TimerObject.Stop();

BackgroundWorker backgroundWorkerObject =newBackgroundWorker();

backgroundWorkerObject.DoWork+=newDoWorkEventHandler(StartThreads);

backgroundWorkerObject.RunWorkerAsync();

TimerObject.Start();
}

privatevoidStartThreads(object sender,DoWorkEventArgs e)

{
tasks
=newTask[4];
tasks
[0]=Task.Factory.StartNew(()=>DoSomeLongWork());
tasks
[1]=Task.Factory.StartNew(()=>DoSomeLongWork());
tasks[2]=Task.Factory.StartNew(()=>DoSomeLongWork());
tasks
[3]=Task.Factory.StartNew(()=>DoSomeLongWork());

// Give the tasks a second to start.
Thread.Sleep(1000);
}

privatevoidDoSomeLongWork()

{

while(Index<Summ.Length)

{

int localIndex =0;

// lock the global variable from accessing by multiple threads at a time
lock(_countLock)

{
localIndex
=Index;

Index++;

}

//I wrote rundom number generation just a an example of doing some calculation and getting some result. It can also be some long calculation.

Random rnd =newRandom();

int someResult = rnd.Next(1,100000);

// lock the global variable (Summ) to give it the result of calculation

lock(_countLock)

{

Summ[localIndex]= someResult;

}

}

}

// button by which I start the application working

privatevoidStart_Button_Click_1(object sender,RoutedEventArgs e)

{

TimerObject.Start();

}

}

}

Viewing all articles
Browse latest Browse all 32065

Trending Articles