lusinekh/HttpClientUsing

HttpClientUsing

The program loads the pdf File.

The program use HttpClient.

The program definse the class of HttpClientDownloadWithProgress.

The HttpClientDownloadWithProgress class contains the full functionality of HttpClient.

        private async Task DownloadFileFromHttpResponseMessage(HttpResponseMessage response)
        {
            response.EnsureSuccessStatusCode();

            var totalBytes = response.Content.Headers.ContentLength;

            using (var contentStream = await response.Content.ReadAsStreamAsync())
                await ProcessContentStream(totalBytes, contentStream);
        }
        private async Task ProcessContentStream(long? totalDownloadSize, Stream contentStream)
        {
            var totalBytesRead = 0L;
            var readCount = 0L;
            var buffer = new byte[8192];
            var isMoreToRead = true;

            using (var fileStream = new FileStream(_destinationFilePath, FileMode.Create, FileAccess.Write, FileShare.None, 8192, true))
            {
                do
                {
                    var bytesRead = await contentStream.ReadAsync(buffer, 0, buffer.Length);
                    if (bytesRead == 0)
                    {
                        isMoreToRead = false;
                        TriggerProgressChanged(totalDownloadSize, totalBytesRead);
                        continue;
                    }
                    await fileStream.WriteAsync(buffer, 0, bytesRead);

                    totalBytesRead += bytesRead;
                    readCount += 1;

                    if (readCount % 100 == 0)
                        TriggerProgressChanged(totalDownloadSize, totalBytesRead);
                }
                while (isMoreToRead);
            }
        }