读取文件流并写入文件流

  Stream stream = File.OpenRead(Server.MapPath("0.jpg"));
          
        long len = stream.Length;
        byte[] buff = new byte[len];
        stream.Read(buff, 0, buff.Length);


        Stream f = new FileStream(Server.MapPath("1.jpg"), FileMode.OpenOrCreate);
        BinaryWriter write = new BinaryWriter(f);
        write.Write(buff, 0, buff.Length);