How to make streams from BLOBs available in plain old C# objects when using SqlDataReader?

Question

This is the scenario:

• We store files, e.g. relatively large documents (10-300MB), in blobs in our MSSQL database.
• We have a very small domain model so we

Answer 1

There's a bug; you are ignoring the user's args, and you should probably guard for -ve returned:

  public override int Read(byte[] buffer, int index, int count)
  {
     long returned = dataReader.GetBytes(0, currentPosition,
         buffer, 0, buffer.Length);
     currentPosition += returned;
     return Convert.ToInt32(returned);
  }

should probably be:

  public override int Read(byte[] buffer, int index, int count)
  {
     long returned = dataReader.GetBytes(0, currentPosition,
         buffer, index, count);
     if(returned > 0) currentPosition += returned;
     return (int)returned;
  }

(otherwise you are writing into the wrong part of the buffer)

But generally looks good.