private async Task Client_DownloadStringCompleted(UrlListViewItem item)
{
item.Progress = 100;
var content = await item.Content;
if (content != null)
{
item.DownloadStatus = DownloadStatus.Downloaded;
}
}
private Action CancellationRegisterAction(WebClient client, UrlListViewItem item)
{
return(() =>
{
if (item.DownloadStatus == DownloadStatus.Downloading)
{
item.DownloadStatus = DownloadStatus.Canceled;
client.CancelAsync();
}
});
}
private void FillItemListWithTestData()
{
var file200Mb = new UrlListViewItem {
Url = "http://ipv4.download.thinkbroadband.com:8080/200MB.zip"
};
var file100Mb = new UrlListViewItem {
Url = "http://ipv4.download.thinkbroadband.com:8080/100MB.zip"
};
var file50Mb = new UrlListViewItem {
Url = "http://ipv4.download.thinkbroadband.com:8080/50MB.zip"
};
var file20Mb = new UrlListViewItem {
Url = "http://ipv4.download.thinkbroadband.com:8080/20MB.zip"
};
ItemList.Add(file200Mb);
ItemList.Add(file100Mb);
ItemList.Add(file50Mb);
ItemList.Add(file20Mb);
}
private async Task <byte[]> DownloadPageAsync(UrlListViewItem item, CancellationToken cancellationToken)
{
using (var client = new WebClient())
using (cancellationToken.Register(CancellationRegisterAction(client, item)))
{
try
{
client.DownloadProgressChanged += (sender, e) => DownloadProgressChanged(e, item);
client.DownloadDataCompleted += async(sender, e) => await Client_DownloadStringCompleted(item);
item.DownloadStatus = DownloadStatus.Downloading;
return(await client.DownloadDataTaskAsync(item.Url));
}
catch (Exception ex)
{
if (ex is WebException == false)
{
item.DownloadStatus = DownloadStatus.Failed;
}
return(null);
}
}
}
private void DownloadProgressChanged(DownloadProgressChangedEventArgs e, UrlListViewItem item)
{
item.Progress = e.ProgressPercentage;
}
