private void OnDownloadFinished(object sender, AsyncCompletedEventArgs e)
{
BookEventArg file = e.UserState as BookEventArg;
if (e.Cancelled)
{
file.Status = -1;
}
else if (e.Error != null) //Failed
{
file.Status = e.Error.HResult;
}
else //Success
{
file.Status = 0;
}
BookDownloadCompleted?.Invoke(this, file);
_downloaders.Remove(file.URL);
}
protected void DownloadBook(BookEventArg e)
{
if (IsCancel)
{
e.Status = -1;
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
WebClient webClient = null;
if (_downloaders.ContainsKey(e.URL))
{
webClient = _downloaders[e.URL];
}
else
{
webClient = new WebClient();
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(OnDownloadFinished);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(OnDownloadProgressChanged);
_downloaders.Add(e.URL, webClient);
}
if (IsCancel)
{
e.Status = -1;
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
if (webClient != null)
{
if (webClient.IsBusy)
{
webClient.CancelAsync();
}
if (File.Exists(e.Path))
{
System.IO.FileInfo fi = new FileInfo(e.Path);
if (fi.Length > 0)
{
BookDownloadingFileExist?.Invoke(this, e);
if (!e.Overwriten)
{
e.Status = 2;
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
}
}
if (IsCancel)
{
e.Status = -1;
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
try
{
if (EnsureDirectoryExist(e.Path))
{
webClient.DownloadFile(new Uri(e.URL), e.Path);
e.Status = 0;
}
else
{
e.Status = -1;
}
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
catch (Exception ex)
{
e.Status = 1;
e.Progress = 100;
BookDownloadCompleted?.Invoke(this, e);
return;
}
}
}
