CODEWITHSUNDEEP
wpfc#-4.0task-parallel-library
Kiran Reddy
Kiran Reddy

Reputation: 2904

Task Parallel Library - running dependent tasks

Dot Net Version = 4. Language = C#

I am pretty much a novice in c# so please consider me a beginner :).

What i am trying to do: Create a WPF app that displays computer uptime information in a datagrid Get computernames from a listbox and run a "Ping" function using TPL which returns a status property indicating whether the computer was alive or unreachable.

If the status property from a task returned "success" then i would run an "uptime" function to get the uptime from the server and add it to an observable collection which will serve as input to a datagrid.

I am currently having trouble running the second task that is - "Uptime" function which seems to be freezing the UI. I am not sure if i should be running the "uptime" function inside a "continuewith" block. Also i would like to be able to cancel out of all operations when required.

CODE:

        private void btn_Uptime_Click(object sender, RoutedEventArgs e)
    {

        List<Task> tasks = new List<Task>();
        tokenSource = new CancellationTokenSource();
        var ui = TaskScheduler.FromCurrentSynchronizationContext();

        foreach (var item in Listbox1.Items)
        {

            string host = item.ToString();

            // Start Parallel execution of tasks
            var compute = Task.Factory.StartNew(() =>
            {
                return PingHost(host);

            }, tokenSource.Token);

            tasks.Add(compute);

            if(compute.Result.Status.ToLower() == "success")    
            {
                //Need to run the getuptime function based on the "success" result from each compute task 
                //without freeqing the UI.
                WMIHelper.GetUptime(compute.Result.ComputerName); 
            }
     }

Upvotes: 2

Views: 432

Answers (1)

yo chauhan
yo chauhan

Reputation: 12295

Try this

       ......
        tasks.Add(compute);
        compute.ContinueWith(c=>
        {
            if(c.Result.Status.ToLower() == "success")
            Dispatcher.Invoke(()=>WMIHelper.GetUptime(compute.Result.ComputerName));
        });

Upvotes: 1

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