使用FileStream来读取数据

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            //List泛型和 字符数组转换
            //char[] chs = new char[] { ‘c‘, ‘c‘, ‘a‘ };
            //List<char> listChar = chs.ToList();
            //for (int i = 0; i < listChar.Count; i++)
            //{
            //    Console.WriteLine(listChar[i]);
            //}

            //使用FileStream来读取数据
            FileStream fsRead = new FileStream(@"D:\教程\buffer.txt",FileMode.OpenOrCreate,FileAccess.Read);
            byte[] buffer = new byte[1024 * 1024 * 5];//规定缓冲区大小
            int r = fsRead.Read(buffer, 0, buffer.Length);//返回本次实际读取的有效字节数
            //string s = Encoding.Default.GetString(buffer, 0, r);//将字节数组中的元素编码转换成字符串
            string s = Encoding.UTF8.GetString(buffer, 0, r);//将字节数组中的元素编码转换成字符串
            fsRead.Close();//关闭流
            fsRead.Dispose();//释放流占用的资源
            Console.WriteLine(s);
            Console.ReadKey();

            //using语句自动用Close()和Dispose();释放资源，使用FileStream来写入数据
            //using (FileStream fsWrite = new FileStream(@"D:\教程\buffer.txt",FileMode.OpenOrCreate,FileAccess.Write))
            //{
            //    string str = "看我有没有把你覆盖掉";
            //    byte[] buffer = Encoding.Default.GetBytes(str);
            //    fsWrite.Write(buffer,0,buffer.Length);
            //}
            //Console.WriteLine("写入完成");
            //Console.ReadKey();
        }

    }
}