//1.普通写法
//2.忽略字节的写法
//3.忽略转换的写法

            using (Stream stream = new MemoryStream())
            {
                byte[] bytes1 = UnicodeEncoding.Unicode.GetBytes(s);
                byte[] bytes2 = BitConverter.GetBytes(n);
                stream.Write(bytes1, 0, bytes1.Length);
                stream.Write(bytes2, 0, bytes2.Length);

                stream.Seek(0, SeekOrigin.Begin);
                byte[] bytes3 = new byte[stream.Length - 4];
                byte[] bytes4 = new byte[4];
                stream.Read(bytes3, 0, bytes3.Length);
                stream.Read(bytes4, 0, bytes4.Length);

                MessageBox.Show(UnicodeEncoding.Unicode.GetString(bytes3)+"  "+BitConverter.ToInt32(bytes4,0));
                //====================================================
                StreamWriter writer = new StreamWriter(stream);
                writer.WriteLine(s);
                writer.WriteLine(n);
                writer.Flush();
                stream.Seek(0, SeekOrigin.Begin);

                StreamReader reader = new StreamReader(stream);
                string s2 = reader.ReadLine();
                int n2 = int.Parse(reader.ReadLine);
                //=========================================================
                BinaryWriter writer = new BinaryWriter(stream);
                writer.Write(s);
                writer.Write(n);
                writer.Flush();
                stream.Seek(0,SeekOrigin.Begin);
                BinaryReader reader = new BinaryReader(stream);
                string s2 = reader.ReadString();
                int n2 = reader.ReadInt32();


            }