After fileStream.CopyTo(memoryStream), memoryStream is null

c#, windows-phone-7

Solution

`Stream.CopyTo` copies from the current position of `fileStream` which has been changed by `SaveJpeg()` so you need to reset it;

var memoryStream = new MemoryStream();

fileStream.Position = 0;
fileStream.CopyTo(memoryStream);

Problem

So, I have the function, which gets `BitmapImage`, I need to save it to iso storage and convert to Base64 (for sending to server). However, copying from `fileStream` to `memoryStream` is not successful. ``` public void SetImage(BitmapImage bitmap) { if (isoFiles.FileExists(Settings.FILE_AVATAR_JPG)) isoFiles.DeleteFile(Settings.FILE_AVATAR_JPG); var fileStream = isoFiles.CreateFile(Settings.FILE_AVATAR_JPG); var wb = new WriteableBitmap(bitmap); wb.SaveJpeg(fileStream, 120, 120, 0, 85); // file is saved var memoryStream = new MemoryStream(); fileStream.CopyTo(memoryStream); // here, memoryStream is null byte[] result = memoryStream.ToArray(); fileStream.Close(); var base64 = Convert.ToBase64String(result); } ```

Original source