void Download()
{
DownloadSubTask subTask = task_.GetSubTask();
while (subTask != null)
{
byte[] data = HttpDownloadRange.Download(subTask.RemotePath, subTask.from, subTask.to);
if (data == null)
{
Console.WriteLine("download error");
break;
}
subTask.data = data;
var b = task_.UpdateTaskState(subTask, 2);
if (b)
{
Console.WriteLine("download finish");
break;
}
subTask = task_.GetSubTask();
}
}