[C#] Download File Supporting Resume

Simple function in C# that allows to download a file from the internet and supports to resume the download, using HttpWebRequest/HttpWebResponse and FileStream

	public static void downloadFile(string sourceURL, string destinationPath)
	{
	long fileSize = 0;
	int bufferSize = 1024;
	bufferSize *= 1000;
	long existLen = 0;
	System.IO.FileStream saveFileStream;
	if (System.IO.File.Exists(destinationPath))
	{
	System.IO.FileInfo destinationFileInfo = new System.IO.FileInfo(destinationPath);
	existLen = destinationFileInfo.Length;
	}
	if (existLen > 0)
	saveFileStream = new System.IO.FileStream(destinationPath,
	System.IO.FileMode.Append,
	System.IO.FileAccess.Write,
	System.IO.FileShare.ReadWrite);
	else
	saveFileStream = new System.IO.FileStream(destinationPath,
	System.IO.FileMode.Create,
	System.IO.FileAccess.Write,
	System.IO.FileShare.ReadWrite);
	System.Net.HttpWebRequest httpReq;
	System.Net.HttpWebResponse httpRes;
	httpReq = (System.Net.HttpWebRequest) System.Net.HttpWebRequest.Create(sourceURL);
	httpReq.AddRange((int) existLen);
	System.IO.Stream resStream;
	httpRes = (System.Net.HttpWebResponse) httpReq.GetResponse();
	resStream = httpRes.GetResponseStream();
	fileSize = httpRes.ContentLength;
	int byteSize;
	byte[] downBuffer = new byte[bufferSize];
	while ((byteSize = resStream.Read(downBuffer, 0, downBuffer.Length)) > 0)
	{
	saveFileStream.Write(downBuffer, 0, byteSize);
	}
	}

view raw DownloadFile.cs hosted with ❤ by GitHub

What about you, how do you downloading files using C# ?

Tagged: C#, download file, programming