public static void DownloadText(string address, Stopwatch?watch, DownloadTextResultHandler callback, bool ignoreCache, out bool isFound)
{
string FileName = LocalFileName(address);
string FilePath = Path.GetDirectoryName(FileName);
if (!ignoreCache && File.Exists(FileName))
{
using (FileStream Stream = new FileStream(FileName, FileMode.Open, FileAccess.Read))
{
using (StreamReader Reader = new StreamReader(Stream))
{
string Content = Reader.ReadToEnd();
isFound = !string.IsNullOrEmpty(Content);
callback(isFound, Content);
}
}
}
else
{
if (!Directory.Exists(FilePath))
{
Directory.CreateDirectory(FilePath);
}
Task <Tuple <bool, string?> > DownloadTask = new Task <Tuple <bool, string?> >(() => { return(ExecuteDownloadText(address, watch)); });
DownloadTask.Start();
OnCheckDownload(DownloadTask, address, callback, out isFound);
}
}
/// <summary>
/// Downloads a page of text from the Internet.
/// </summary>
/// <param name="address">The page address.</param>
/// <param name="callback">The download handler.</param>
public static void DownloadText(string address, DownloadTextResultHandler callback)
{
Task <DownloadResult> DownloadTask = new Task <DownloadResult>(() => { return(ExecuteDownloadText(address)); });
DownloadTask.Start();
PollDownload(DownloadTask, callback);
}
private static void OnCheckDownload(Task <DownloadResult> downloadTask, DownloadTextResultHandler callback)
{
if (downloadTask.IsCompleted)
{
DownloadResult Result = downloadTask.Result;
callback(Result);
}
else
{
PollDownload(downloadTask, callback);
}
}
private static void PollDownload(Task <DownloadResult> downloadTask, DownloadTextResultHandler callback)
{
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.ContextIdle, new Action <Task <DownloadResult>, DownloadTextResultHandler>(OnCheckDownload), downloadTask, callback);
}
private static void OnCheckDownload(Task <Tuple <bool, string?> > downloadTask, string address, DownloadTextResultHandler callback, out bool isFound)
{
isFound = false;
for (; ;)
{
if (downloadTask.IsCompleted)
{
Tuple <bool, string?> Result = downloadTask.Result;
callback(Result.Item1, Result.Item2);
isFound = Result.Item1;
string FileName = LocalFileName(address);
string FilePath = Path.GetDirectoryName(FileName);
if (!File.Exists(FileName))
{
if (!Directory.Exists(FilePath))
{
Directory.CreateDirectory(FilePath);
}
using (FileStream Stream = new FileStream(FileName, FileMode.Create, FileAccess.Write))
{
using (StreamWriter Writer = new StreamWriter(Stream))
{
Writer.Write(Result.Item2);
}
}
}
break;
}
Thread.Sleep(1000);
}
}
