文件的读取与读入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace _8_2
{
    class Program
    {
        static void Main(string[] args)
        {
  //用StreamReader和StreamWriter来读取流和写入流
            string path = @"E:\ccc\bbb\11.jpg";
            StreamReader tr = new StreamReader(path);
            string str;
            while ((str = tr.ReadLine() )!= null)
            {
                Console.WriteLine(str);
                //str = Console.WriteLine();
            }
            //Console.WriteLine(str = tr.ReadToEnd());

            tr.Close();
  //写入流
            StreamWriter sw = new StreamWriter(path);
            sw.Write(str+"ddf");//原来的内容和新的内容
            sw.Close();
  //注意每次都要关闭读入流和写入流
            Stream str = Stream.Null;
            FileStream fs = new FileStream(path, FileMode.OpenOrCreate);
            byte[] by = new byte[50000];
            Console.WriteLine(fs.Read(by, 0, 50000));
            //FileStream fs1 = File.OpenWrite(@"E:\ccc\bbb\11.txt");
            FileStream fs1 = new FileStream(@"E:\ccc\bbb\88.jpg", FileMode.OpenOrCreate);
  //我们建个空的图像88.jpg用来将11.jpg写入。
            byte[] by1 = new byte[50000];
            fs1.Read(by1, 0, 50000);
            fs1.Write(by, 0, by.Length);

            fs1.Close();
            fs.Close();

 通过此应用我们可以把图像存入数据库，需要时可以从数据库中读出。
        }
    }
}