ASP.NET 中，实现download下载，弹出打开和保存对话框，不限制文件大小，跪求实现代码，谢谢了

Posted 2023-05-15

昨天的那位大侠，再次麻烦你了，谢谢

思路很简单，读取服务器文件路径，然后再保存数据流，下面是实现代码：
（ps:因为要上班，来不及写很多注释，关键的地方加了几句注释哈）

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.htmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using YTLib.Basic;
using YTLib.YTDBC;
using System.IO;
using System.Threading;
namespace siteadmin.admin

public partial class downfile : System.Web.UI.Page


protected void Page_Load(object sender, EventArgs e)

string strSQL = "";

YTNDBObject dbo = new YTNDBObject();
dbo.DataName = "Main";
Page.EnableViewState = false;
if(!IsPostBack)

string sid=Request["id"];
if(!YTLib.publicOP.IsNumString(sid)||sid==null)
sid="0";
strSQL = "select * from FileSource where ID=@ID";
dbo.PrepareCommand(strSQL);
dbo.SetCmdIntValue("@ID",int.Parse(sid));
DataTable dt=dbo.QueryData().Tables[0];
string sourceName = (string)dt.Rows[0]["FilePath"];
sourceName.Trim();//消除空格
string filesnames = sourceName.Substring(7, sourceName.Length - 8);
int index= sourceName.LastIndexOf(".");
string extend = sourceName.Substring(index+1);//扩展名
string fullPath = "~/uploaded/" + sourceName;
fullPath = Server.MapPath(fullPath);
//读出该资源的下载次数
int downloadtimes = 0;

downloadtimes = int.Parse(dt.Rows[0]["downloadCounts"].ToString());

Page.Response.Clear();
bool success = ResponseFile(Page.Request, Page.Response, filesnames, fullPath, 1024000);
if (!success) Response.Write("<script language=\"javascript\">alert(\"Download file error\");window.location.href=\"../Download.aspx\"</script>");
else

//记录下载次数
downloadtimes++;
string sqlStr = "update FileSource set downloadCounts=" + downloadtimes + " where ID=@IID";
dbo.PrepareCommand(sqlStr);
dbo.SetCmdIntValue("@IID",int.Parse(sid));
dbo.ExecuteNoQuery();

Response.Write("<script language=\"javascript\">window.location.href=\"../Download.aspx\"</script>");


public static bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed)

try

FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
BinaryReader br = new BinaryReader(myFile);
try

_Response.AddHeader("Accept-Ranges", "bytes");
_Response.Buffer = false;//不缓冲
long fileLength = myFile.Length;
long startBytes = 0;
double pack = 10240;
//10K bytes
int sleep = 200;
//每秒5次 即5*10K bytes每秒 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
if (_Request.Headers["Range"] != null)

_Response.StatusCode = 206;
string[] range = _Request.Headers["Range"].Split(new char[] '=', '-' );
startBytes = Convert.ToInt64(range[1]);

_Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
if (startBytes != 0)

//Response.AddHeader("Content-Range", string.Format(" bytes 0-1/2", startBytes, fileLength-1, fileLength));

_Response.AddHeader("Connection", "Keep-Alive");
_Response.ContentType = "application/octet-stream";
_Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8));
br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
int maxCount = (int)Math.Floor((fileLength - startBytes) / pack) + 1;
for (int i = 0; i < maxCount; i++)

if (_Response.IsClientConnected)

_Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));
Thread.Sleep(sleep);

else

i = maxCount;



catch

return false;

finally

br.Close();
myFile.Close();


catch

return false;

return true;



参考技术A 本地下载 直接链接压缩包的路径就可以。

要是用迅雷下载，到迅雷官网上找，有专门的链接代码、。

asp.net中GridView怎样进行分页，编辑，删除操作

用 GridView 做个显示数据的，想直接在控件上进行这些操作，应该要怎样写啊

参考技术A 自已从下载的资料中下载示例看吧,示例包含如下内容:
GridView无代码分页排序
GridView选中，编辑，取消，删除
GridView正反双向排序
GridView和下拉菜单DropDownList结合
GridView和CheckBox结合
鼠标移到GridView某一行时改变该行的背景色方法一
鼠标移到GridView某一行时改变该行的背景色方法二
GridView实现删除时弹出确认对话框
GridView实现自动编号
GridView实现自定义时间货币等字符串格式
GridView实现用“...”代替超长字符串
GridView一般换行与强制换行
GridView显示隐藏某一列
GridView弹出新页面/弹出新窗口
GridView固定表头(不用javascript只用CSS，2行代码，很好用)
GridView合并表头多重表头无错完美版(以合并3列3行举例)
GridView突出显示某一单元格(例如金额低于多少，分数不及格等)
GridView加入自动求和求平均值小计
GridView数据导入Excel/Excel数据读入GridView