弹不出文件下载对话框的问题

Question

我用的是vs2005，要实现下载filelist中选定的文件；
现在的问题是，我在vs2005里，调试的时候，可以正常弹出下载对话框；但是一旦“build->publish web”发布到IIS后，点击下载之后，就是一个空白的页面，弹不出下载对话框。哪位又遇到过这样的问题没？
代码如下：            if (DownloadFile.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                Response.ContentType = "application/octet-stream";
                Response.AppendHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
                Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                Response.WriteFile(DownloadFile.FullName);
                Response.Flush();
                Response.End();
            }
            else
            {
                Response.Write(string.Format("<script>alert('{0}')</script>", "文件不存在"));
            }
        }
        catch
        {
            Response.Write(string.Format("<script>alert('{0}')</script>", "下载出错啦"));
        }

Answer 1

public void download()
  {
  string path = Server.MapPath(@"需要下载文件的地址(服务器端的)");
  //下载文件的名称
  string filename = "c.doc";
  System.IO.FileInfo toDownload = new System.IO.FileInfo(path);  if (toDownload.Exists == true)
  {
  const long ChunkSize = 10000;
  byte[] buffer = new byte[ChunkSize];  Response.Clear();
  System.IO.FileStream iStream = System.IO.File.OpenRead(path);
  long dataLengthToRead = iStream.Length;
  Response.ContentType = "application/octet-stream";
  Response.AddHeader("Content-Disposition", "attachment; filename=new_" + HttpUtility.UrlEncode(toDownload.Name));
  while (dataLengthToRead > 0 && Response.IsClientConnected)
  {
  int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
  Response.OutputStream.Write(buffer, 0, lengthRead);
  Response.Flush();
  dataLengthToRead = dataLengthToRead - lengthRead;
  Response.WriteFile(filename);
  }
  Response.Close();
  }
  }

Answer 2

DownloadFile.FullName
断点一下,看看是不是服务器和客户端换个环境就不一样了?

Answer 3

using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;namespace Asiastar.NR.Ajax
{
    /// <summary>
    /// $codebehindclassname$ 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Handler1 : IHttpHandler
    {        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";            string id = context.Request["id"].ToString();//获取资源的编号
            System.IO.Stream iStream = null;
            byte[] buffer = new Byte[10000];
            int length;
            long dataToRead;
            NRBLL.File bf = new Asiastar.NRBLL.File();
            Guid guid = new Guid(id);
            if (bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"] != null)//判断数据库路径是否存在  
            {
                string filepath = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString();//获取资源完整路径    D:\资源文件\600cc139-14cf-448e-9e50-daa972d35e01.jpg
                string Oidfilename = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FileNam"].ToString();//旧文件名称
                //string filename = System.IO.Path.GetFileName(filepath);//获取文件名称+后缀名 600cc139-14cf-448e-9e50-daa972d35e01.JPG
                //int index = filepath.IndexOf(".");
                //string filetype = filepath.Substring(index).ToLower();//后缀名
                //string newfilename = Oidfilename;
                //string filepath1 = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString().Substring(0,filepath.Length - 8);
                try
                {
                    string fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(Oidfilename));//解码(注意这里2层解码)
                    Oidfilename = Oidfilename.Replace("+", "%20");  //将“+”替换成“空格”
                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
                    dataToRead = iStream.Length;
                    context.Response.ContentType = "application/octet-stream";
                    context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Oidfilename, System.Text.Encoding.UTF8));  //下载的时候下载原来的文件名称
                    while (dataToRead > 0)
                    {
                        if (context.Response.IsClientConnected)
                        {
                            length = iStream.Read(buffer, 0, 10000);
                            context.Response.OutputStream.Write(buffer, 0, length);
                            context.Response.Flush();
                            buffer = new Byte[10000];
                            dataToRead = dataToRead - length;
                        }
                        else
                        {
                            dataToRead = -1;
                        }
                    }                }
                catch (Exception ex)
                {
                    NR.Error.Log.LogType(ex.ToString());
                }
                finally
                {
                    if (iStream != null)
                    {
                        iStream.Close();
                    }
                }
            }
            else
            {
                NR.Error.Log.LogType("找不到文件!");
            }
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

Answer 4

用这些方法都没搞定，不知道怎么回事；
后来把实现下载功能的这段代码直接放在aspx文件对应的.cs文件里就好了；
现在仍然不知道原因。