Yaron Levi Yaron Levi - 20 days ago 10
C# Question

WaitAll vs WhenAll

What is the difference between

Task.WaitAll()
and
TaskEx.WhenAll()
from the Async CTP ?
Can you provide some sample code to illustrate the different use cases ?

Answer

Task.WaitAll blocks the current thread until everything has completed.

TaskEx.WhenAll returns a task which represents the action of waiting until everything has completed.

That means that from an async method, you can use:

await TaskEx.WhenAll(tasks);

... which means your method will continue when everything's completed, but you won't tie up a thread to just hang around until that time.