download.aspx
<%
@ Page language="c#" Codebehind="download.aspx.cs" AutoEventWireup="false" Inherits="ZKSTAT.Common.download" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>download</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
</form>
</body>
</HTML>
download.cs
using System;
using System.IO;
using System.Web;
using System.Web.UI;
namespace ZKSTAT.Common
{
/**//// <summary>
/// download 的摘要说明。
/// </summary>
public class download : System.Web.UI.Page
{
private void Page_Load(object sender, EventArgs e)
{
// 在此处放置用户代码以初始化页面
string path = Request.Params["download"];
if(path == null) return;
Stream stream = null; // Buffer to read 10K bytes in chunk:
byte[] buffer = new Byte[10240];
// Length of the file:
int length;
// Total bytes to read:
long dataToRead;
// Identify the file to download including its path.
string path2 = Request.PhysicalPath;
path2 = path2.Substring ( 0,path2.LastIndexOf ( "Common\\" ) );
string filepath = path2 +"UploadFile/Files/" + path;
//filepath = Server.MapPath ( filepath );
// Identify the file name.
string filename = Path.GetFileName(filepath);
try
{
// Open the file.
stream = new FileStream(filepath, FileMode.Open,
FileAccess.Read,FileShare.Read);
Response.Clear();
// Total bytes to read:
dataToRead = stream.Length;
long p = 0;
if(Request.Headers["Range"]!=null)
{
Response.StatusCode = 206;
p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
}
if(p != 0)
{
Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());
}
Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString());
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));
stream.Position = p;
dataToRead = dataToRead - p;
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (Response.IsClientConnected)
{
// Read the data in buffer.
length = stream.Read(buffer, 0, 10240);
// Write the data to the current output stream.
Response.OutputStream.Write(buffer, 0, length);
// Flush the data to the HTML output.
Response.Flush();
buffer= new Byte[10240];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch (Exception ex)
{
// Trap the error, if any.
Response.Write("错误 : " + ex.Message);
}
finally
{
if (stream != null)
{
//Close the file.
stream.Close();
}
Response.End();
}
}
Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new EventHandler(this.Page_Load);
}
#endregion
}
}
转载于:https://www.cnblogs.com/yknb/archive/2006/07/06/444049.html
本文介绍了一个使用 C# 实现的 Web 文件下载功能。通过分析代码，详细展示了如何响应用户的下载请求，处理文件流并设置正确的 HTTP 头来支持断点续传等功能。
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