Question

i am trying to convert a bitmap to a base64 string.i can convert to from string to bitmap…but it seems like there is a problem when converting from bitmap to string.I was hoping you guys could give me a hand

    public static string BitmapToString(BitmapImage image)
    {

        Stream stream = image.StreamSource ;
        Byte[] buffer = null;
        if (stream != null && stream.Length > 0)
        {
            using (BinaryReader br = new BinaryReader(stream))
            {
                buffer = br.ReadBytes((Int32)stream.Length);
            }
        }

        return Convert.ToBase64String(buffer);
    }

it gets a ArgumentNullException was unhandled
Value cannot be null.
Parameter name: inArray
when returning Convert.ToBase64String(buffer)

Help?

Answer 1

Try this alternative:

 public string BitmapToBase64(BitmapImage bi)
        {
            MemoryStream ms = new MemoryStream();
            PngBitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(bi));
            encoder.Save(ms);
            byte[] bitmapdata = ms.ToArray();

            return Convert.ToBase64String(bitmapdata);
        }

In your solution, it is not necessary that StreamSource will always have value if it is loaded using a Uri.