Task inside and outside a loop

Question

I have two methods below. Can you please tell me what each method do in brief and how does the two methods differ from each other ?

 public void Method1() { foreach (string symbol in arrList) { Task.Factory.StartNew(() => DoWork(symbol)); } } public void Method2() { Task.Factory.StartNew(() => { foreach (string symbol in arrList) { DoWork(symbol); } }); }

You already have an answer - "Task inside and outside a loop". Can you please clarify what you don't understand? Especially after reading documentation on StartNew? — Alexei Levenkov
– Alexei Levenkov, Commented Jul 19, 2016 at 17:50
Will method2 create separate task for each for-loop or no ?? — user3447602
– user3447602, Commented Jul 19, 2016 at 17:52
@user3447602 How many times is DoWork() called in Method2 (inside the loop) and how many times when you just made a single call? If you can answer that you have the answer to your question. — Sir Rufo
– Sir Rufo, Commented Jul 19, 2016 at 18:00

Matt Coats · Accepted Answer · 2016-07-19 17:52:54Z

3

The first will create many asynchronous Tasks that each call DoWork with the given symbol. The second will create one asynchronous Task that will do the entire loop before exiting.

answered Jul 19, 2016 at 17:52

Matt Coats

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2 Comments

user3447602 Over a year ago

Thanks. Is it possible to know if all the tasks in the first method got completed ?

juharr Over a year ago

@user3447602 Sure, collect them in a list and pass them to Task.WhenAll.

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