文件的下载

Demo：图片下载到本地

//下载图片
        protected void lbtnUpLoad_Click(object sender, EventArgs e)
        {
            int fileID = 0;
            if (int.TryParse(Request.QueryString["FileID"], out fileID))
            {
                Files wFile = BLLManage<Files>.GetModel("fileid=" + fileID, "RealName,Path");
                string f_name = wFile.RealName;
                string f_path = wFile.Path;

                string  strRootPath = Explorer.Web.Utility.Directory.GetUserDomainPhysicalPath(this.User.OperateHome.HomeDomain);

                System.IO.FileInfo file = new FileInfo(strRootPath + f_path);
                Response.Clear();
                Response.AddHeader("Content-Disposition", "attachment;   filename="+f_name );
                Response.AddHeader("Content-Length", file.Length.ToString());
                Response.ContentType = "application/octet-stream";
                Response.WriteFile(file.FullName);
                Response.End();
                Response.Flush();
                Response.Clear(); 
            }
        }

Demo：下载有数据的Excel文档

    protected void btnExportDate_Click(object sender, EventArgs e)
    {
        Response.Clear();
        //attachment 参数表示作为附件下载，可以改成online在线打开
        //filename=FileFlow.xls 制定输出文件的名称，注意其扩展名和制定文件类型相符，可以为：.doc  .xls  .txt  .htm　　
        Response.AppendHeader("Content-Disposition", "attachment;filename=EOL_" + DateTime.Now.Ticks + ".xls");

        //编码格式
        //Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
        Response.ContentEncoding = System.Text.Encoding.UTF8;

        //Response.ContentType制定文件类型，可以为：application/ms-excel,application/ms-word ,application/ms-txt,application/ms-html或其他浏览器可直接支持的文档　 
        Response.ContentType = "application/ms-excel";
        gvwOut.EnableViewState = false;

        System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

        //将目标数据绑定到输入流输出　　 
        //this 表示输出本页，也可以绑定GridView,或其他支持 obj.RenderControl() 属性的控件　
        gvwOut.RenderControl(oHtmlTextWriter);
        //this.DataBind.RenderControl(oHtmlTextWriter); 
        Response.Write(oStringWriter.ToString());
        Response.End(); 
}