IEnumerable<Task<Request>> requestTasks = CreateRequestTasks();
Task<Trace> traceTask = CreateTraceTask();
var tasks = new List<Task>();
tasks.AddRange(requestTasks);
tasks.Add(traceTask);
await Task.WhenAll(tasks);
How do I get the result from the requestTasks collection?
How do I get the result from the requestTasks collection?
Keep it as a separate (reified) collection:
List<Task<Request>> requestTasks = CreateRequestTasks().ToList();
...
await Task.WhenAll(tasks);
var results = await Task.WhenAll(requestTasks);
Note that the second await Task.WhenAll won't actually do any "asynchronous waiting", because all those tasks are already completed.
Since you have to await them all, you can simply write
IEnumerable<Task<Request>> requestTasks = CreateRequestTasks();
Task<Trace> traceTask = CreateTraceTask();
var tasks = await Task.WhenAll(requestTasks);
var trace = await traceTask;
inside an equivalent async block: it may look clearer imho.
Notice also that the above traceTask starts on create (actually this is the same answer since the question itself is a duplicate).
foreach(var meTask in tasks) /*get result/*meTask.Result;? Or even simplierforeach(Task<Request> meTask in requestTasks) meTask.Result;Resultis a synchronous blocking wait.async-awaitis to not block a thread while you wait for a task to finish.await Task.WhenAll(tasks);so after these tasks are done he can just useforeachto retrieve results ( which were previously made in task ). Or maybe I'm missing something in here.