public static DownloadedFileAsync <T> Create(Uri uri, Func <DownloadedFileAsync <T>, Stream, T> convertResult, CancellationToken cancellationToken)
{
var df = new DownloadedFileAsync <T>();
using (WebClient web = new WebClient())
{
var tcs = new TaskCompletionSource <T>();
cancellationToken.Register(() => tcs.SetCanceled());
web.OpenReadCompleted += (sender, args) =>
{
if (args.Error != null)
{
tcs.SetException(new DownloadedFileAsyncException("Error downloading content from \"{0}\"".Format2(uri), args.Error));
return;
}
if (args.Cancelled)
{
tcs.SetCanceled();
return;
}
try
{
string hcd = web.ResponseHeaders["content-disposition"];
df.ContentType = web.ResponseHeaders["content-type"];
if (!string.IsNullOrEmpty(hcd))
{
ContentDisposition cd = new ContentDisposition(hcd);
df.Filename = cd.FileName;
}
tcs.SetResult(convertResult(df, args.Result));
}
catch (Exception ex)
{
tcs.SetException(new DownloadedFileAsyncException("Error downloading content from \"{0}\"".Format2(uri), ex));
}
};
web.OpenReadAsync(uri);
df.Task = tcs.Task;
}
return(df);
}
public static DownloadedFileAsync <Stream> Create(Uri uri, CancellationToken cancellationToken)
{
return(DownloadedFileAsync <Stream> .Create(uri, (df, stream) => stream, cancellationToken));
}