using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
//TransmitFile实现下载
protected void Button1_Click(object sender, EventArgs e)
{
/*
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
代码如下：
*/
Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
string filename = Server.MapPath("DownLoad/z.zip");
Response.TransmitFile(filename);
}
//WriteFile实现下载
protected void Button2_Click(object sender, EventArgs e)
{
/*
using System.IO;
*/
string fileName ="asd.txt";//客户端保存的文件名
string filePath=Server.MapPath("DownLoad/aaa.txt");//路径
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
//WriteFile分块下载
protected void Button3_Click(object sender, EventArgs e)
{
string fileName = "aaa.txt";//客户�
用c#给PDA做了一个PC端的通讯程序，需要保存两个参数。用Delphi时，是保存在ini文件中，c#读写XML比较方便，就用xml文件来保存了。
class CXmlClass
{
private string XmlFilePath;
/// <summary>
/// 下载到PDA的TXT文件路径
/// </summary>
......
在了解HTTP断点续传的原理之前，先来说说HTTP协议，HTTP协议是一种基于tcp的简单协议，分为请求和回复两种。请求协议是由客户机(浏览器)向服务器（WEB SERVER）提交请求时发送报文的协议。回复协议是由服务器(web server)，向客户机(浏览器)回复报文时的协议。请求和回复协议都由头和体组成。头和体之间以一行空行为分隔。
......
用Asp.Net上传文件,首用到的是FileUpload控件
<asp:FileUpload ID="FileUpload1" runat="server" /><br />
<asp:Button ID="btn" runat="server" Text="确定" OnClick="btn_Click"/>
C#代码
protected void btn_Click(object sender, EventArgs e)
{
//判断 ......
