public static async Task DownloadFileAsync(this CustomWebClient webClient, string uri, string filename, IProgress <ProgressReport> progress, CancellationToken token)
{
if (webClient == null)
{
throw new ArgumentNullException(nameof(webClient));
}
if (filename == null)
{
throw new ArgumentNullException(nameof(filename));
}
using (var fileStream = new FileStream(filename, FileMode.CreateNew, FileAccess.Write, FileShare.None))
{
await webClient
.DownloadDataAsync(uri, fileStream, progress, token)
.ConfigureAwait(continueOnCapturedContext: false);
}
}