public void RunAndWait(
Action <object, DoWorkEventArgs> action,
Action <object, RunWorkerCompletedEventArgs> actionComplete,
int millisecondsTimeout)
{
using (var worker = new TaskWorker(null))
{
// can be rewritten to support cancelling by adding
// the worker to the TasksQueue and implementing
// worker.CancellationTokenSource.Token.WaitHandle.WaitOne
worker.WorkerReportsProgress = false;
worker.WorkerSupportsCancellation = true;
AutoResetEvent waitEvent = new AutoResetEvent(false);
worker.DoWork += (sender, args) =>
{
if (worker.CancellationPending == false && !worker.CancellationTokenSource.IsCancellationRequested)
{
if (action != null)
{
action.Invoke(sender, args);
}
}
else
{
args.Cancel = true;
return;
}
};
worker.RunWorkerCompleted += (sender, args) =>
{
if (actionComplete != null)
{
actionComplete.Invoke(sender, args);
}
waitEvent.Set();
};
worker.RunWorkerAsync();
var waitResult = waitEvent.WaitOne(millisecondsTimeout);
if (waitResult == false)
{
throw new TimeoutException("Task thread timed out.");
}
}
}
public void QueueWorkerWithDelay(
Queue <TaskWorker> queue,
object item,
Action <object, DoWorkEventArgs> action,
Action <object, RunWorkerCompletedEventArgs> actionComplete,
Action <RunWorkerCompletedEventArgs> displayError,
Action <object, ProgressChangedEventArgs> progressChange,
int millisecondsDelay)
{
if (queue == null)
{
throw new ArgumentNullException("queue");
}
using (var worker = new TaskWorker(item))
{
worker.WorkerReportsProgress = true;
worker.WorkerSupportsCancellation = true;
worker.ProgressChanged += (sender, args) =>
{
if (worker.CancellationPending == false && progressChange != null)
{
progressChange.Invoke(sender, args);
}
};
worker.DoWork += (sender, args) =>
{
if (worker.CancellationPending == false)
{
if (millisecondsDelay > 0)
{
var cancelled = worker.CancellationTokenSource.Token
.WaitHandle.WaitOne(millisecondsDelay);
if (cancelled)
{
args.Cancel = true;
return;
}
}
if (action != null)
{
action.Invoke(sender, args);
}
}
else
{
args.Cancel = true;
return;
}
};
// This method may not fire if the worker is destroyed prematurely!
worker.RunWorkerCompleted += (sender, args) =>
{
if (actionComplete != null)
{
actionComplete.Invoke(sender, args);
}
if (queue.Count != 0)
{
queue.Dequeue();
}
if (queue.Count > 0)
{
var next = queue.Peek();
if (next.WorkerReportsProgress)
{
next.ReportProgress(0, "Performing operation...");
}
next.RunWorkerAsync(next.Sender);
}
else
{
if (displayError != null)
{
displayError.Invoke(args);
}
}
};
queue.Enqueue(worker);
if (queue.Count > 0)
{
var next = queue.Peek();
if (next.WorkerReportsProgress)
{
next.ReportProgress(0, "Performing operation...");
}
if (!next.CancellationPending && !next.IsBusy)
{
next.RunWorkerAsync(next.Sender);
}
}
}
}
