Response.WriteFile(Server.MapPath("Kav.exe"));下载不了文件？

Question

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.ContentType = "application/octet-stream";
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
        Response.WriteFile(Server.MapPath("Kav.exe"));
    }
}

Answer 1

private void downloadfile(string fname)
...{
    if (fname == null || fname.trim() == "")
        return;
    fileinfo file = new fileinfo(fname);    response.clear();
    response.addheader("content-disposition",
        "attachment;  filename=" + httputility.urlencode((file.name), system.text.encoding.utf8));
    response.addheader("content-length", file.length.tostring());
    response.contenttype = "application/octet-stream";
    //Response.WriteFile(Server.MapPath("/Kav.exe"));
    response.writefile(file.fullname);
    response.flush();    response.close();
    response.end();
}

Answer 2

通过hyperlink连接文件，直接打开或
Response.ContentType = "application/octet-stream";
   Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));

Answer 3

用这个下载试试#region 下载服务器上的文件
    /// <summary>
    /// 下载服务器上的文件
    /// </summary>
    /// <param name="PageResponse">程序中可以设置参数:HttpResponse ht=Page.Response;</param>
    /// <param name="serverPath">服务器上的文件路径</param>
    public void DownloadFile(HttpResponse response, string serverPath)
    {
        FileStream fs = null;
        try
        {
            fs = File.OpenRead(serverPath);
            byte[] buffer = new byte[1024];
            long count = 1024;
            response.Buffer = true;
            response.AddHeader("Connection", "Keep-Alive");
            response.ContentType = "application/octet-stream";
            response.AddHeader("Content-Disposition", "attachment;filename=" + Path.GetFileName(serverPath));//下载时要保存的默认文件名
            response.AddHeader("Content-Length", fs.Length.ToString());
            while (count == 1024)
            {
                count = fs.Read(buffer, 0, 1024);
                response.BinaryWrite(buffer);
            }
        }
        catch
        {
        }
        finally
        {
            fs.Close();
        }
    }
    #endregion