public TaskExtender <byte[]> AddToDownload(string url, bool removeOnComplete)
{
//if url is not in queue, than create new task
if (_tasks.Any(t => t.TaskName == url))
{
return(_tasks.First(t => t.TaskName == url));
}
TaskExtender <byte[]> newTask;
if (_lastInQueue != null)
{
//if task is not first in queue, than create this task as continuation for previous one
newTask = _lastInQueue.ContinueWith(nxt => { return(_fileDownloader.Download(url)); }, url, removeOnComplete
);
}
else
{
//this is first task in queue, just add it to the queue
newTask = new TaskExtender <byte[]>(() => { return(_fileDownloader.Download(url)); }, url, removeOnComplete);
}
newTask.OnTaskCompleted += InnerCompletion;
_tasks.Enqueue(newTask);
_lastInQueue = newTask;
return(_lastInQueue);
}
/// <summary>
/// Allows to set Func as continuation to current TaskExtender;
/// </summary>
/// <param name="func">func to create the task</param>
/// <param name="taskName">task name</param>
/// <param name="removeOnCompleted">remove extender from queue on completion</param>
/// <returns></returns>
public TaskExtender <T> ContinueWith <T>(Func <object, T> func, string taskName, bool removeOnCompleted)
{
Task <T> newTask = this.Task.ContinueWith(func);
var newExtender = new TaskExtender <T>(newTask, taskName, removeOnCompleted);
newExtender.TaskName = taskName;
return(newExtender);
}