直接保存文件 [英] saving a file directly

问题描述

我想直接点击链接下载并保存文件...请帮助

解决方案

如果用户无法专门保存文件点击链接：浏览器将遵守用户设置的任何规则，包括任何需要确认的规则。



如果您的意思是我如何给用户点击链接，然后下载文件？然后它取决于许多因素：

1）文件是否在可用文件夹中相对于网站？如果是这样，那么你可以给文件一行：

 <   a     href   =  http://MyDomain.com/folder/file.txt > 点击此处下载！<   / a  >  

2）文件是否存储在数据库中？如果是，则提供类似于上述的链接，但通过ASPX页面引用文件：

 <   a     href   =  wm5ftdl.aspx？file = 2552129f-4629-4432-9de3-8177870d81be    target   =  _ blank  > 点击此处下载！<   / a  >  

然后在页面中，从数据库中检索数据：

 <％@    页   语言  =  C＃    AutoEventWireup   =  true    CodeFile   =  wm5ftdl.aspx.cs   继承  =  wm5ftdl   ％>  
 
 <％ 
  //  在给定文件名的情况下将下载文件发送到客户端。  
  string  guid = Request.QueryString [ 文件]; 
  string  fileName =   ERROR; 
  byte  [] data =  new   byte  [] { 0 ， 0 ， 0 ， 0 }; 
  string  strCon = System.Web.Configuration.WebConfigurationManager.ConnectionStrings [  DownloadDatabase]的ConnectionString。 
 使用（System.Data.SqlClient.SqlConnection con =  new  System.Data.SqlClient。 SqlConnection（strCon））
 {
 con.Open（）; 
  string  strcmd =   SELECT [iD] ，cn。[fileName]，[description]，[dataContent]，[version] + 
   FROM dlContent cn + 
 
   WHERE cn.iD = @ID; 
 使用（System.Data.SqlClient.SqlCommand cmd =  new  System.Data.SqlClient。 SqlCommand（strcmd，con））
 {
 cmd.Parameters.AddWithValue（  @ ID ，guid）; 
 使用（System.Data.SqlClient.SqlDataReader r = cmd.ExecuteReader（））
 {
  if （r.Read（））
 {
 fileName =（ string ）r [  filename]; 
 data =（ byte  []）r [  dataContent]; 
} 
} 
} 
} 
 Response.Clear（）; 
 Response.AddHeader（  Cache-Control，  no-cache，must-revalidate，post-check = 0，pre-check = 0）; 
 Response.AddHeader（  Pragma，   no-cache）; 
 Response.AddHeader（  Content-Description， 文件下载）; 
 Response.AddHeader（  Content-Type，  application / force-download）; 
 Response.AddHeader（  Content-Transfer-Encoding，  binary \ n）; 
 Response.AddHeader（  content-disposition，  attachment; filename = + fileName）; 
 Response.BinaryWrite（data）; 
  //   Response.WriteFile（wm5ftdata /+ fileName）;  
到Response.End（）; 
 ％>  

.CS文件中没有任何内容：

 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.Linq; 
 使用 System.Web; 
 使用 System.Web.UI; 
 使用 System.Web.UI.WebControls; 
 
  public   partial   class  wm5ftdl：System.Web.UI.Page 
 {
  protected   void  Page_Load（ object  sender，EventArgs e）
 {
 
} 
} 

I want to directly download and save a file on click of a link...please help

解决方案

You can't specifically save the file if the user clicks on a link: the browser will obey whatever rules the user has set up, including any which require a confirmation.

If you mean "how do I give a user a link to click on, and it downloads a file?" then it depends on a number of factors:
1) Is the file in an available folder relative to the website? If so, then you can just give a line to the file:

<a href="http://MyDomain.com/folder/file.txt">Click here to download!</a>

2) Is the file stored in a database? If so, then give a link similar to the above, but with a file reference via an ASPX page:

<a href="wm5ftdl.aspx?file=2552129f-4629-4432-9de3-8177870d81be" target="_blank">Click here to download!</a>

Then in the page, retrieve the data from the DB:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="wm5ftdl.aspx.cs" Inherits="wm5ftdl" %>

<%  
    // Send a download file to the client given the filename.    
    string guid = Request.QueryString["file"];
    string fileName = "ERROR";
    byte[] data = new byte[] { 0, 0, 0, 0 };
    string strCon = System.Web.Configuration.WebConfigurationManager.ConnectionStrings["DownloadDatabase"].ConnectionString;
    using (System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(strCon))
        {
        con.Open();
        string strcmd = "SELECT [iD] ,cn.[fileName],[description] ,[dataContent] ,[version] " +
                        "FROM dlContent cn " +

                        "WHERE cn.iD=@ID";
        using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(strcmd, con))
            {
            cmd.Parameters.AddWithValue("@ID", guid);
            using (System.Data.SqlClient.SqlDataReader r = cmd.ExecuteReader())
                {
                if (r.Read())
                    {
                    fileName = (string) r["filename"];
                    data = (byte[]) r["dataContent"];
                    }
                }
            }
        }
    Response.Clear();
    Response.AddHeader("Cache-Control", "no-cache, must-revalidate, post-check=0, pre-check=0");
    Response.AddHeader("Pragma", "no-cache");
    Response.AddHeader("Content-Description", "File Download");
    Response.AddHeader("Content-Type", "application/force-download");
    Response.AddHeader("Content-Transfer-Encoding", "binary\n");
    Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
    Response.BinaryWrite(data);
    //Response.WriteFile("wm5ftdata/" + fileName);
    Response.End();  
%>

There is nothing much in the .CS file:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class wm5ftdl : System.Web.UI.Page
    {
    protected void Page_Load(object sender, EventArgs e)
        {

        }
    }

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