public async Task <ActionResult> FlowOfExecutionExample()
{
ViewBag.ExperimentType = "Asynchronous experiments - flow of execution example.";
var asyncExperiments = new AsyncExperiments();
return(View("AsyncExperiments", await asyncExperiments.FlowOfExecutionExample()));
}
public async Task <ActionResult> NestedAsyncCallsWithWait()
{
ViewBag.ExperimentType = "Asynchronous experiments - nested 11-second call which we wait for.";
var asyncExperiments = new AsyncExperiments();
return(View("AsyncExperiments", await asyncExperiments.NestedAsyncExperimentsNumberSix()));
}
public async Task <ActionResult> CallingCodeWhichContainsMultipleAwaits()
{
ViewBag.ExperimentType = "Asynchronous experiments - Calling Code Which Contains Multiple Awaits.";
var asyncExperiments = new AsyncExperiments();
await asyncExperiments.CallingCodeWhichContainsMultipleAwaits();
return(View("AsyncExperiments", 10));
}
public async Task <ActionResult> NestedAsyncCallsNoWait()
{
ViewBag.ExperimentType = "Asynchronous experiments - nested 11-second call which we don't wait for.";
var asyncExperiments = new AsyncExperiments();
var task = asyncExperiments.NestedAsyncExperimentsNumberSeven();
await Task.Delay(1000);
return(View("AsyncExperiments", await task));
//await Task.Delay(10);
//return View("AsyncExperiments", 1);
}
public ActionResult CallAsyncCodeInANonAsyncContext()
{
ViewBag.ExperimentType = "Asynchronous experiments - Call Async Code In A Non-Async Context.";
var asyncExperiments = new AsyncExperiments();
Debug.WriteLine("Because we are not in an async method, even though we do not await the return, we will still block the thread until it is completed.");
asyncExperiments.ReturnATaskEvenThoughWeHaveUsedTheAwaitKeywordMoreThanOnce();
Debug.WriteLine("We won't get here until the async function is completed.");
return(View("AsyncExperiments", 10));
}
public async Task <ActionResult> CreateADeadlock()
{
ViewBag.ExperimentType = "Asynchronous experiments - deadlock example. Warning! This will hang!!";
var asyncExperiments = new AsyncExperiments();
var task = asyncExperiments.FlowOfExecutionExample();
var result = task.Result;
System.Diagnostics.Debug.WriteLine("Because of the deadlock, this line of code will never be reached!");
return(View("AsyncExperiments", result));
}
public async Task <ActionResult> PlaceATaskInADifferentContextAndWaitForIt()
{
ViewBag.ExperimentType = "Asynchronous experiments - awaiting a task in a different context.";
var asyncExperiments = new AsyncExperiments();
var task = asyncExperiments.PlaceATaskInADifferentContext(102);
System.Diagnostics.Debug.WriteLine("R1. The task in the different context has been kicked off.");
System.Diagnostics.Debug.WriteLine("R2. We ARE awaiting its results.");
return(View("AsyncExperiments", await task));
}
public async Task <ActionResult> EachAsyncMethodHasItsOwnContext()
{
ViewBag.ExperimentType = "Asynchronous experiments - Each Async Method Has Its Own Context.";
var asyncExperiments = new AsyncExperiments();
// At this point the current http context and sychronization contexts are both populated.
ContextHelper.OutputRequestAndSynchronizationContexts("Before ConfigureAwait(false): ");
var result = await asyncExperiments.EachAsyncMethodHasItsOwnContext().ConfigureAwait(false);
// At this point the current http context and sychronization contexts are no longer populated.
ContextHelper.OutputRequestAndSynchronizationContexts("After ConfigureAwait(false): ");
// Note that even though we are no longer in the request context, the base controller class has kept
// track of the response in its Response property, so we can still access the response in this class.
Response.StatusCode = (int)HttpStatusCode.BadRequest;
return(View("AsyncExperiments", result));
}
public async Task <ActionResult> ReportProgress()
{
ViewBag.ExperimentType = "Asynchronous experiments - Reporting Progress.";
var asyncExperiments = new AsyncExperiments();
var progressIndicator = new Progress <ProgressIndicator>(ReportProgress);
try
{
_cancellationToken.Dispose();
_cancellationToken = new CancellationTokenSource();
await asyncExperiments.MarkedAsyncWithIntegerTaskReturningRandomValueToDifferentContext(
_cancellationToken.Token,
progressIndicator);
}
catch (Exception e)
{
ProgressHub.CancelProcessing(e.Message);
}
return(View("AsyncExperiments", 10));
}
