Question

I was looking for this and I couldn’t figure how to do it.

I have a some threats (tasks) in an App.

    foreach (string targetMachine in targetMachines)
    {
        Task<int> task = Task.Run(() => Magic(targetMachine));
    }

I created a task for every object in an array.
The task returns a value.
I want to process the values and act based on them. As example, if task return 0 dont do anything, if returns 1 write a log, if returns 2 run a process.

How can I acoomplish this?
If I process the return values inside the foreach:

foreach (string targetMachine in targetMachines)
    {
        Task<int> task = Task.Run(() => Magic(targetMachine));
        Task.Waitforexit()
        if (task.result == 2)
        {
        do something
        }
    }

I think, task are not going to be useful and the programa will wait each task to be completed to continue.

Answer 1

It can be something like this:

foreach (string targetMachine in targetMachines)
{
    Task.Run(() =>
    {
        var result = Magic(targetMachine);
        if (result == 2)
        {
            DoSomething();
        }
    });
}

OR (using async/await)

foreach (string targetMachine in targetMachines)
{
    var result = await Task.Run(() => Magic(targetMachine));
    if (result == 2)
    {
        DoSomething();
    }
}

OR (using ContinueWith)

foreach (string targetMachine in targetMachines)
{
    Task<int>.Run(()=>Magic(targetMachine))
        .ContinueWith(t =>
        {
            if (t.Result == 2)
            {
                DoSomething();
            }
        });
}

If you want to wait to finish all of your tasks

Parallel.ForEach(targetMachines, targetMachine =>
{
    var result = Magic(targetMachine);
    if (result == 2)
    {
        DoSomething();
    }
});