public static void UsingTaskFactory()
{
Task<Int32[]> parent = Task.Run(() =>
{
var result = new Int32[3];
TaskFactory tf = new System.Threading.Tasks.TaskFactory(TaskCreationOptions.AttachedToParent,
TaskContinuationOptions.ExecuteSynchronously);
tf.StartNew(() => result[0] = 0);
tf.StartNew(() => result[1] = 1);
tf.StartNew(() => result[2] = 2);
return result;
});
var finalTask = parent.ContinueWith(
ParentTask =>
{
foreach (int i in ParentTask.Result)
{
Console.WriteLine(i);
}
});
finalTask.Wait();
}
public static TResult RunSync <TResult>(Func <Task <TResult> > func)
{
var cultureUi = CultureInfo.CurrentUICulture;
var culture = CultureInfo.CurrentCulture;
return(taskFactory.StartNew(() =>
{
Thread.CurrentThread.CurrentCulture = culture;
Thread.CurrentThread.CurrentUICulture = cultureUi;
return func();
}).Unwrap().GetAwaiter().GetResult());
}
/// <summary>
/// Creates and starts a task.
/// </summary>
public static SystemTask StartNew(SystemTaskFactory factory, Action action, SystemCancellationToken cancellationToken)
{
var runtime = CoyoteRuntime.Current;
if (runtime.SchedulingPolicy is SchedulingPolicy.None)
{
return(factory.StartNew(action, cancellationToken));
}
return(runtime.TaskFactory.StartNew(action, cancellationToken,
runtime.TaskFactory.CreationOptions, runtime.TaskFactory.Scheduler));
}
/// <summary>
/// Creates and starts a generic task.
/// </summary>
public static SystemTasks.Task <TResult> StartNew <TResult>(SystemTaskFactory factory,
Func <object, TResult> function, object state, SystemCancellationToken cancellationToken)
{
var runtime = CoyoteRuntime.Current;
if (runtime.SchedulingPolicy is SchedulingPolicy.None)
{
return(factory.StartNew(function, state, cancellationToken));
}
return(runtime.TaskFactory.StartNew(function, state, cancellationToken,
runtime.TaskFactory.CreationOptions, runtime.TaskFactory.Scheduler));
}
/// <summary>
/// Creates and starts a task.
/// </summary>
public static SystemTask StartNew(SystemTaskFactory factory, Action action, SystemCancellationToken cancellationToken,
SystemTaskCreationOptions creationOptions, SystemTaskScheduler scheduler)
{
var runtime = CoyoteRuntime.Current;
if (runtime.SchedulingPolicy is SchedulingPolicy.None ||
scheduler.GetType() != SystemTaskScheduler.Default.GetType())
{
return(factory.StartNew(action, cancellationToken, creationOptions, scheduler));
}
return(runtime.TaskFactory.StartNew(action, cancellationToken,
runtime.TaskFactory.CreationOptions | creationOptions,
runtime.TaskFactory.Scheduler));
}
/// <summary>
/// Creates and starts a task.
/// </summary>
public static SystemTasks.Task <TResult> StartNew <TResult>(SystemTaskFactory factory,
Func <object, TResult> function, object state, SystemCancellationToken cancellationToken,
SystemTaskCreationOptions creationOptions, SystemTaskScheduler scheduler)
{
var runtime = CoyoteRuntime.Current;
if (runtime.SchedulingPolicy is SchedulingPolicy.None ||
scheduler.GetType() != SystemTaskScheduler.Default.GetType())
{
return(factory.StartNew(function, state, cancellationToken, creationOptions, scheduler));
}
return(runtime.TaskFactory.StartNew(function, state, cancellationToken,
runtime.TaskFactory.CreationOptions | creationOptions,
runtime.TaskFactory.Scheduler));
}
/// <inheritdoc />
public void Start(Action action)
{
_cancellationTokenSource = new CancellationTokenSource();
_task = _taskFactory.StartNew(action, _cancellationTokenSource.Token);
}
public static Task <T> StartNewDexterTask <T>(this TaskFactory factory, Func <T> action, TaskCreationOptions options = TaskCreationOptions.None)
{
return(factory.StartNew(CreateNewFunc(action), options));
}
public static Task StartNewDexterTask(this TaskFactory factory, Action action, TaskCreationOptions options = TaskCreationOptions.None)
{
return(factory.StartNew(CreateNewAction(action), options));
}
/// <summary>Asynchronously iterates through an enumerable of tasks.</summary>
/// <param name="factory">The target factory.</param>
/// <param name="source">The enumerable containing the tasks to be iterated through.</param>
/// <param name="state">The asynchronous state for the returned Task.</param>
/// <param name="cancellationToken">The cancellation token used to cancel the iteration.</param>
/// <param name="creationOptions">Options that control the task's behavior.</param>
/// <param name="scheduler">The scheduler to which tasks will be scheduled.</param>
/// <returns>A Task that represents the complete asynchronous operation.</returns>
public static Task Iterate(
this TaskFactory factory,
IEnumerable <object> source, object state,
CancellationToken cancellationToken, TaskCreationOptions creationOptions, TaskScheduler scheduler)
{
// Validate/update parameters
if (factory == null)
{
throw new ArgumentNullException("factory");
}
if (source == null)
{
throw new ArgumentNullException("asyncIterator");
}
if (scheduler == null)
{
throw new ArgumentNullException("scheduler");
}
// Get an enumerator from the enumerable
var enumerator = source.GetEnumerator();
if (enumerator == null)
{
throw new InvalidOperationException("Invalid enumerable - GetEnumerator returned null");
}
// Create the task to be returned to the caller. And ensure
// that when everything is done, the enumerator is cleaned up.
var trs = new TaskCompletionSource <object>(state, creationOptions);
trs.Task.ContinueWith(_ => enumerator.Dispose(), CancellationToken.None, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
// This will be called every time more work can be done.
Action <Task> recursiveBody = null;
recursiveBody = antecedent =>
{
try
{
// If we should continue iterating and there's more to iterate
// over, create a continuation to continue processing. We only
// want to continue processing once the current Task (as yielded
// from the enumerator) is complete.
if (enumerator.MoveNext())
{
var nextItem = enumerator.Current;
// If we got a Task, continue from it to continue iterating
if (nextItem is Task)
{
var nextTask = (Task)nextItem;
/**/ nextTask.IgnoreExceptions(); // TODO: Is this a good idea?
nextTask.ContinueWith(recursiveBody).IgnoreExceptions();
}
// If we got a scheduler, continue iterating under the new scheduler,
// enabling hopping between contexts.
else if (nextItem is TaskScheduler)
{
Task.Factory.StartNew(() => recursiveBody(null), CancellationToken.None, TaskCreationOptions.None, (TaskScheduler)nextItem).IgnoreExceptions();
}
// Anything else is invalid
else
{
trs.TrySetException(new InvalidOperationException("Task or TaskScheduler object expected in Iterate"));
}
}
// Otherwise, we're done!
else
{
trs.TrySetResult(null);
}
}
// If MoveNext throws an exception, propagate that to the user,
// either as cancellation or as a fault
catch (Exception exc)
{
var oce = exc as OperationCanceledException;
if (oce != null && oce.CancellationToken == cancellationToken)
{
trs.TrySetCanceled();
}
else
{
trs.TrySetException(exc);
}
}
};
// Get things started by launching the first task
factory.StartNew(() => recursiveBody(null), CancellationToken.None, TaskCreationOptions.None, scheduler).IgnoreExceptions();
// Return the representative task to the user
return(trs.Task);
}
/// <summary> /// Executes an async Task method which has a void return value synchronously /// USAGE: AsyncUtil.RunSync(() => AsyncMethod()); /// </summary> /// <param name="task">Task method to execute</param> public static void RunSync(Func <Task> task) => _taskFactory .StartNew(task) .Unwrap() .GetAwaiter() .GetResult();
