我在我的代码中收到错误，从asp.net页面生成pdf文件 [英] i am getting error in my code to generate pdf file from asp.net page

问题描述

  protected   void  Submitbtn_Click（对象发​​件人，EventArgs e）
 {
 {Response.ContentType =  应用/ PDF; 
 Response.AddHeader（  content-disposition，  attachment; filename = FileName.pdf）; 
 Response.Cache.SetCacheability（HttpCacheability.NoCache）; 
 
 StringWriter sw =  new  StringWriter（）; 
 
 HtmlTextWriter w =  new  HtmlTextWriter（sw）; 
 print.RenderControl（w）
 
  string  htmWrite = sw.GetStringBuilder（）。ToString（）; 
 htmWrite = Regex.Replace（htmWrite， ， ）; 
 htmWrite = htmWrite.Replace（  \\\\ n， ）; 
 StringReader reader =  new  StringReader（htmWrite）; 
 
文件doc =  new 文件（PageSize.A4,10f，10f，100f，0f）; 
  string  pdfFilePath = Server.MapPath（  。）+   / PDFFiles; 
 
 HTMLWorker htmlparser =  new  HTMLWorker（doc）; 
 PdfWriter.GetInstance（doc，Response.OutputStream）; 
 
 doc.Open（）; 
 尝试 
 {
 
 htmlparser.Parse（读者）; 
 doc.Close（）; 
 Response.Write（doc）; 
 Response.End（）; 
} 
  catch （例外）
 {} 
 最后 
 {
 doc.Close（）; 
} 
 
 
 
  public  覆盖  void  VerifyRenderingInServerForm（控制控件）
 {
  / *  验证控件是否已呈现* /  
} 
} 
显示错误  
 RegisterForEventValidation只能在Render（）期间调用; 

解决方案

尝试设置 EnableEventValidation =false 属性到aspx页面的@Page指令。



参考 RegisterForEventValidation只能在Render（）期间调用; [ ^ ]

protected void Submitbtn_Click(object sender, EventArgs e)
 {
     {                    Response.ContentType = "application/pdf";
                Response.AddHeader("content-disposition", "attachment;filename=FileName.pdf");
                Response.Cache.SetCacheability(HttpCacheability.NoCache);

                StringWriter sw = new StringWriter();

                HtmlTextWriter w = new HtmlTextWriter(sw);
                print.RenderControl(w)

                string htmWrite = sw.GetStringBuilder().ToString();
                htmWrite = Regex.Replace(htmWrite, "", "");
                htmWrite = htmWrite.Replace("\r\n", "");
                StringReader reader = new StringReader(htmWrite);

                Document doc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
                string pdfFilePath = Server.MapPath(".") + "/PDFFiles";

                HTMLWorker htmlparser = new HTMLWorker(doc);
                PdfWriter.GetInstance(doc, Response.OutputStream);

                doc.Open();
                try
                {

                    htmlparser.Parse(reader);
                    doc.Close();
                    Response.Write(doc);
                    Response.End();
                }
                catch (Exception )
                { }
                finally
                {
                   doc.Close();
                }



        public override void VerifyRenderingInServerForm(Control control)
        {
             /* Verifies that the control is rendered */
        }
}
error shown is
RegisterForEventValidation can only be called during Render();

解决方案

Try setting EnableEventValidation="false" property to @Page directive of aspx page.

Refer RegisterForEventValidation can only be called during Render();[^]

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