C#字节byte类型读取与写入

//创建文件
            //File.Create(@"D:a.txt");
            //Console.WriteLine("创建成功");

            ////删除文件
            //File.Delete(@"D:a.txt");
            //Console.WriteLine("删除成功");

            //string st1 = "今天天气好晴朗，处处好风光";
            //byte[] bt = Encoding.Default.GetBytes(st1);
            //File.WriteAllBytes(@"D:a.txt", bt);

            //byte[] str=File.ReadAllBytes(@"D:a.txt");

            //string strr = Encoding.GetEncoding("utf-8").GetString(str);

           // File.WriteAllLines(@"D:a.txt", new string[] { "123123", "的是的发", "asd3dasd2222" });
            //Console.WriteLine(strr);