How can I Wait for Arrays of Tasks of different Types?

Question

I have a pretty simple looking problem, but I can't seem to find the answer anywhere.

Given I have several arrays of tasks of different types e.g.

Task<Dog>[] dogTasks = GetDogTasks();
Task<Cat>[] catTasks = GetCatTasks();
Task<Fish>[] fishTasks = GetFishTasks();

What would be the best way to WaitAll() for these tasks?

@PatrickHofman I get the error `The best overloaded method match for 'System.Threading.Tasks.Task.WaitAll(params System.Threading.Tasks.Task[])' has some invalid arguments` - `Argument 1: cannot convert from 'System.Threading.Tasks.Task — Phil Pill, Dec 03 '15 at 10:45
Sorry, missed it was an array. See the duplicate to see how to construct a new array of all tasks. — Patrick Hofman, Dec 03 '15 at 10:49
No worries. I tried the other solution already - it doesn't work for differing types. My question is not a duplicate of the other. — Phil Pill, Dec 03 '15 at 10:50

Sergii Zhevzhyk · Accepted Answer · 2015-12-03T10:57:46.420

5

WaitAll should solve your problem. You have arrays of tasks so you should create one array from them:

var tasks = new List<Task>();
tasks.AddRange(dogTasks);
tasks.AddRange(catTasks);
tasks.AddRange(fishTasks);
Task.WaitAll(tasks.ToArray());

edited Dec 03 '15 at 10:57

answered Dec 03 '15 at 10:41

Sergii Zhevzhyk

1 Answers1