Task.WaitAll, how to find the tasks causing AggregateException

Question

Let's say that I got the following code:

var tasks = BuildTaskList();
try
{
    Task.WaitAll(tasks.ToArray());
}
catch (AggregateException exception)
{

}

How do I know which task threw which of the exceptions in exception.InnerExceptions?

Answer 1

You still have the list of Tasks, and each Task has an Exception property. Using that you can figure out which exceptions belong with which Task.

But, if you can, it'd be better to use Task.WhenAll or TaskFactory.ContinueWhenAll than do a blocking Wait.