protected IEnumerator Start()
{
ProgressTask <float, string> task = new ProgressTask <float, string>(new System.Func <IProgressPromise <float, string>, IEnumerator>(DoTask), true);
/* Start the task */
task.OnPreExecute(() =>
{
Debug.Log("The task has started.");
}).OnPostExecute((result) =>
{
Debug.LogFormat("The task has completed. result:{0}", result);/* only execute successfully */
}).OnProgressUpdate((progress) =>
{
Debug.LogFormat("The current progress:{0}%", (int)(progress * 100));
}).OnError((e) =>
{
Debug.LogFormat("An error occurred:{0}", e);
}).OnFinish(() =>
{
Debug.Log("The task has been finished.");/* completed or error or canceled*/
}).Start();
// /* Cancel the task in three seconds.*/
// this.StartCoroutine (DoCancel (task));
/* wait for the task finished. */
yield return(task.WaitForDone());
Debug.LogFormat("IsDone:{0} IsCanceled:{1} Exception:{2}", task.IsDone, task.IsCancelled, task.Exception);
}