static async Task HandleLongRunningTask()
{
string currentMethodName = nameof(HandleLongRunningTask);
Task <bool> task = null;
bool result = false;
var _cts = new CancellationTokenSource();
var info = new InfoObject {
ThrowIfCancellingRequesting = true, TestCase = "CancellationToken", MillisToSleep = 2112
};
var lenghtyStuff = new LengthyStuff();
info.IncreaseIndentationLevel();
// cancel the task after some time
_cts.CancelAfter(4567);
try
{
info.Log($"In {currentMethodName} before starting DoLengthy...");
// there is really not much difference
//task = lenghtyStuff.DoLengthyOperationAsyncWithCancellationToken(info, _cts.Token);
//task = Task.Run(async () => await lenghtyStuff.DoLengthyOperationAsyncWithCancellationToken(info, _cts.Token), _cts.Token);
task = lenghtyStuff.DoLengthyOpAsyncWithCtInNewThread(info, _cts.Token);
result = await task;
info.Log($"In {currentMethodName} after awaiting DoLengthy...");
}
catch (OperationCanceledException)
{
info.Log($"In {currentMethodName} received OperationCanceledException, return false");
result = false;
}
info.Log($"In {currentMethodName} Task.State <{task?.Status}>, Result: <{result}>");
info.DecreaseIndentationLevel();
}
private async Task <bool> HandleLongRunningTask()
{
string currentMethodName = nameof(HandleLongRunningTask);
Task <bool> task = null;
bool result = false;
_cts = new CancellationTokenSource();
var info = new InfoObject {
Logger = LogIt, ThrowIfCancellingRequesting = true, TestCase = "CancellationToken", MillisToSleep = GetSimulatedWorkInMillis()
};
var lenghtyStuff = new LengthyStuff();
info.IncreaseIndentationLevel();
int testVariant = GetTestVariant();
if (testVariant == TV_LONG_RUNNING_CANCELED_BEFORE_START)
{
// cancel the task right away, will throw TaskCanceledException, if ct is provided for Task and not only for Method
_cts.Cancel();
}
try
{
info.Log($"In {currentMethodName} before starting DoLengthy...");
if (testVariant == TV_LONG_RUNNING_JUST_AWAIT)
{
task = lenghtyStuff.DoLengthyOperationAsyncWithCancellationToken(info, _cts.Token);
}
else if (testVariant == TV_LONG_RUNNING_AWAIT_AND_TASK_RUN)
{
task = Task.Run(async() => await lenghtyStuff.DoLengthyOperationAsyncWithCancellationToken(info, _cts.Token), _cts.Token);
}
else if (testVariant == TV_LONG_RUNNING_AWAIT_AND_TASK_RUN_WITH_EXCEPTION_HANDLING)
{
task = lenghtyStuff.DoLengthyOpAsyncWithCtInNewThread(info, _cts.Token);
}
if (null == task)
{
// to see a status of a task
task = Task.Run(async() => { await Task.Delay(1); return(false); }, _cts.Token);
}
result = await task;
info.Log($"In {currentMethodName} after awaiting DoLengthy...");
}
// unnecessary, cos TaskCanceledException is derived from OperationCanceledExceoption
//catch (TaskCanceledException)
//{
// info.Log($"In {currentMethodName} received TaskCanceledException, return false");
// result = false;
//}
catch (OperationCanceledException)
{
info.Log($"In {currentMethodName} received OperationCanceledException, return false");
result = false;
}
info.Log($"In {currentMethodName} Task.State <{task?.Status}>, Result: <{result}>");
info.DecreaseIndentationLevel();
return(result);
}