This code is pretty short and (hopefully) easy to understand:
public const int CHUNK_SIZE = 4096;
public const string UPLOAD_URI = "http://localhost:55087/FileUpload.ashx?filename={0}&append={1}";
private Stream _data;
private string _fileName;
private long
_bytesTotal;
private long _bytesUploaded;
private void UploadFileChunk()
{
string uploadUri = ""; // Format the upload URI according to wether the it's the first chunk of the file
if (_bytesUploaded == 0)
{
uploadUri = String.Format(UPLOAD_URI,_fileName,0); // Dont't append
}
else if (_bytesUploaded < _bytesTotal)
{
uploadUri = String.Format(UPLOAD_URI, _fileName, 1); // append
}
else
{
return; // Upload finished
}
byte[] fileContent = new byte[CHUNK_SIZE];
_data.Read(fileContent, 0, CHUNK_SIZE);
WebClient wc = new WebClient();
wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
Uri u = new Uri(uploadUri);
wc.OpenWriteAsync(u, null, fileContent);
_bytesUploaded += fileContent.Length;
}
void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
if (e.Error == null)
{
object[] objArr = e.UserState as object[];
byte[] fileContent = objArr[0] as byte[];
int bytesRead = Convert.ToInt32(objArr[1]);
Stream outputStream = e.Result;
outputStream.Write(fileContent, 0, bytesRead);
outputStream.Close();
if (_bytesUploaded < _bytesTotal)
{
UploadFileChunk();
}
else
{
// Upload complete
}
}
}
For a complete downloadable solution see my blog post on this: File Upload in Silverlight - a Simple Solution
