C#读写文件流方法

        static void Main(string[] args)        {            //C#文件流写文件,默认追加FileMode.Append             string msg = "okffffffffffffffff";            byte[] myByte = System.Text.Encoding.UTF8.GetBytes(msg);            using (FileStream fsWrite = new FileStream(@"D:\1.txt", FileMode.Append))            {                fsWrite.Write(myByte, 0, myByte.Length);            };             //c#文件流读文件             using (FileStream fsRead = new FileStream(@"D:\1.txt", FileMode.Open))            {                int fsLen = (int)fsRead.Length;                byte[] heByte = new byte[fsLen];                int r = fsRead.Read(heByte, 0, heByte.Length);                string myStr = System.Text.Encoding.UTF8.GetString(heByte);                Console.WriteLine(myStr);                Console.ReadKey();            }         }