/// <summary>
/// Wraps the non-generic <see cref="T:System.Threading.Tasks.Task" /> into a generic <see cref="T:System.Threading.Tasks.Task" />.
/// </summary>
/// <param name="taskAction">The task to wrap.</param>
/// <returns>A <see cref="T:System.Threading.Tasks.Task" /> that wraps the non-generic <see cref="T:System.Threading.Tasks.Task" />.</returns>
private static Task <bool> StartAsGenericTask(Func <Task> taskAction)
{
Task task = taskAction();
if (task == null)
{
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, Resources.TaskCannotBeNull, new object[]
{
"taskAction"
}), "taskAction");
}
if (task.Status == TaskStatus.RanToCompletion)
{
return(AsyncExecution.GetCachedTask());
}
if (task.Status == TaskStatus.Created)
{
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, Resources.TaskMustBeScheduled, new object[]
{
"taskAction"
}), "taskAction");
}
TaskCompletionSource <bool> tcs = new TaskCompletionSource <bool>();
task.ContinueWith(delegate(Task t)
{
if (t.IsFaulted)
{
tcs.TrySetException(t.Exception.InnerExceptions);
return;
}
if (t.IsCanceled)
{
tcs.TrySetCanceled();
return;
}
tcs.TrySetResult(true);
}, TaskContinuationOptions.ExecuteSynchronously);
return(tcs.Task);
}
public AsyncExecution(Func <Task> taskAction, ShouldRetry shouldRetry, Func <Exception, bool> isTransient, Action <int, Exception, TimeSpan> onRetrying, bool fastFirstRetry, CancellationToken cancellationToken) : base(() => AsyncExecution.StartAsGenericTask(taskAction), shouldRetry, isTransient, onRetrying, fastFirstRetry, cancellationToken)
{
}
