看了好多种方法

好像都是通过Response转换来的

public void Open()
    {

        string FullFileName = "";

        //ASP.NET下载文件(弹出打开保存文件对话框)
        //fileURL为带路径的文件全名
        /*
        string fileURL = url;
        System.IO.FileInfo fileInfo = new System.IO.FileInfo(fileURL);
        Response.Clear();
        Response.AddHeader("content-disposition","attachment;filename="+Server.UrlEncode(fileInfo.Name.ToString()));
        Response.AddHeader("content-length",fileInfo.Length.ToString());
        Response.ContentType = "application/octet-stream";
        Response.ContentEncoding = System.Text.Encoding.Default;
        Response.WriteFile(fileURL);
         */

        //无错版:
        try
        {
            string FileName = ".//路径//书名.pdf";
            FileName = ".//路径//文件名.扩展名";
            FullFileName = Server.MapPath(FileName);
            //FileName--要下载的文件名
            FileInfo DownloadFile = new FileInfo(FullFileName);
            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
            {
                //文件不存在
            }
        }
        catch
        {
           //打开时异常了
        }

    }

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ASP.NET下载文件(弹出打开保存文件对话框)

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