Task.WaitAll Method (Task, CancellationToken)
Waits for all of the provided Task objects to complete execution unless the wait is cancelled.
Assembly: mscorlib (in mscorlib.dll)
public static void WaitAll( Task tasks, CancellationToken cancellationToken )
The cancellationToken was canceled.
The tasks argument is null.
An exception was thrown during the execution of at least one of the Task instances.
The tasks argument contains a null element.
One or more of the Task objects in tasks has been disposed.
The cancellationToken argument is used to cancel the wait operation. Cancellation of the tasks is a distinct operation, and is signaled by the AggregateException as noted above.