ASP.NET中文件流的使用——下载Excle文件、文件的读取和写入

  /// <summary>  /// 下载文件  /// 使用流输出  /// </summary>  /// <param name="sender"></param>  /// <param name="e"></param>  private void Button1_Click(object sender, System.EventArgs e)  {   string sFileName = Server.MapPath("./工作用常用电话号码.xls");   FileStream fileStream=new FileStream(sFileName,FileMode.Open);   long fileSize = fileStream.Length;    byte[] fileBuffer=new byte[fileSize];    fileStream.Read(fileBuffer, 0, (int)fileSize);    //如果不写fileStream.Close()语句，用户在下载过程中选择取消，将不能再次下载   fileStream.Close();   Context.Response.ContentType="application/octet-stream";    Context.Response.AppendHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(sFileName,Encoding.UTF8 ));   Context.Response.AddHeader("Content-Length",fileSize.ToString());    Context.Response.BinaryWrite(fileBuffer);    Context.Response.End();    Context.Response.Close();  }

  /// <summary>  /// 下载文件  /// 直接输出文件方式  /// </summary>  /// <param name="sender"></param>  /// <param name="e"></param>  private void Button2_Click(object sender, System.EventArgs e)  {   string saveFileName = "工作用常用电话号码.xls";   Response.Clear();   Response.Buffer= true;   //Response.Charset = "utf-8";//可有可无？   //下面两个语句是一个含义，不知网上的人为什么要加一个this，非常的不解！   //this.EnableViewState = false;   EnableViewState = false;   //Response.ContentType = "application/ms-excel"; //可有可无？   //Response.ContentEncoding = System.Text.Encoding.UTF8;//可有可无？      //直接写下面的语句，客户端看到的文件名是乱码   //Response.AppendHeader("Content-Disposition","attachment;filename=" + saveFileName);    //必须写成这种   Response.AppendHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(saveFileName,Encoding.UTF8 ));   Response.WriteFile(saveFileName);    Response.Flush();   Response.End();//End和Close的顺序是什么，测试时，两个位置排列交换后对执行没有任何影响   Response.Close();  }

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO; namespace 文件流{    class Program    {        static void Main(string[] args)        {            //C#文件流写文件,默认追加FileMode.Append            string msg = "ok";            byte[] myByte = System.Text.Encoding.UTF8.GetBytes(msg);            using (FileStream fsWrite = new FileStream(@"C:\1.txt", FileMode.Append))            {                fsWrite.Write(myByte, 0, myByte.Length);            };             //c#文件流读文件            using (FileStream fsRead = new FileStream(@"C:\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();            }        }    }}