C# FileStream 使用方法

            #region FileStream读取txt文件
            //using (FileStream fileStream = new FileStream(@"C:UsersadminDesktop1.txt", FileMode.OpenOrCreate, FileAccess.Read))
            //{
            //    byte[] buffer = new byte[1024 * 1024 * 5];
            //    int r = fileStream.Read(buffer, 0, buffer.Length);
            //    string str = Encoding.UTF8.GetString(buffer, 0, r);
            //    Console.WriteLine(str);
            //    Console.ReadKey();
            //}
            #endregion

            #region
            //using (FileStream fileStream = new FileStream(@"C:UsersadminDesktop1.txt", FileMode.OpenOrCreate, FileAccess.Write))
            //{
            //    string str = "我是写入的文本！";
            //    byte[] buffer = Encoding.UTF8.GetBytes(str);
            //    fileStream.Write(buffer, 0, buffer.Length);
            //}
            //Console.WriteLine("写入成功！");
            //Console.ReadKey();
            #endregion