Do we have some C# library or class which can download big file by parts and if connection fails resume download?
I have tried use some build-in WebClient class by it doesn't support resume downloading.
WebClient webClient = new WebClient();
webClient.DownloadFile(link, @"C:\Test\1.zip");
Fail with an exception: "Received an unexpected EOF or 0 bytes from the transport stream".
I made some code which download file with resume support.
static bool DownloadFileWithRange()
{
string link = "http://freelistenonline.com/"; //<- link to some big file
string FilePath = @"C:\Test\1.zip";
if (File.Exists(FilePath))
File.Delete(FilePath);
long totalBytesRead = 0;
long MaxContentLength = 0;
long RequestContentLength = 0;
int i = 0;
while (MaxContentLength == 0 || totalBytesRead < MaxContentLength)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(link);
if (totalBytesRead > 0) request.AddRange(totalBytesRead);
WebResponse response = request.GetResponse();
Console.WriteLine("=============== Request #{0} ==================", ++i);
foreach (var header in response.Headers)
{
if (header.ToSaveString().Contains("Content-Length") || header.ToSaveString().Contains("Content-Range"))
Console.WriteLine("{0}: {1}", header, response.Headers[header.ToString()]);
}
if (response.ContentLength > MaxContentLength)
MaxContentLength = response.ContentLength;
var ns = response.GetResponseStream();
RequestContentLength = 0;
try
{
using (var responseStream = response.GetResponseStream())
{
using (FileStream localFileStream = new FileStream(FilePath, FileMode.Append))
{
var buffer = new byte[4096];
int bytesRead;
while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
totalBytesRead += bytesRead;
RequestContentLength += bytesRead;
localFileStream.Write(buffer, 0, bytesRead);
}
Console.WriteLine("Got bytes: {0}", RequestContentLength);
}
}
}
catch (Exception ex)
{
Console.WriteLine("Got bytes: {0}", RequestContentLength);
}
}
if (MaxContentLength == totalBytesRead)
return true;
return false;
}