Given the following:
class MyEncoding
: ASCIIEncoding
{
public override int GetChars(byte[] bytes, int byteIndex, int byteCount,
char[] chars, int charIndex)
{
// do custom conversion here
}
}
static void ReadTest(string path, int bufferSize)
{
using (StreamReader sr = new StreamReader(path, new FastASCIIEncoding(),
false, bufferSize))
{
char[] buffer = new char[BufferSize];
int count;
while ((count = sr.Read(buffer, 0, bufferSize)) > 0)
{
// do stuff
}
}
}
My overriden GetChars method is never called. Internally, the StreamReader
may/may not create a DecoderNLS instance and then call an internal method in
ASCIIEncoding which cannot be overriden:
internal override unsafe int GetChars(byte* bytes, int byteCount, char*
chars, int charCount, DecoderNLS decoder)
Why is it behaving like that ?
That gives the impression that the Encoding classes are not meant to
be derived, yet they are not sealed.
The best solution I see is to override the GetDecoder method in
ASCIIEncoding and return a custom Decoder which will call
my conversion method.
Anyone can comment on that ? Am I doing the right thing ?
--
Sébastien
www.sebastienlorion.com
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