Converting Asp.net Webpage to PDF using Itextsharp

Question

I get the below error while converting asp.net webpage to pdf

 

Script control 'UpdateProgress1' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().

 

Code behind file as below:

 

protected void btnExport_Click(object sender, EventArgs e)

{

Response.ContentType = "application/pdf";

Response.AddHeader("content-disposition", "attachment;filename=TestPage.pdf");

Response.Cache.SetCacheability(HttpCacheability.NoCache);

StringWriter sw = new StringWriter();

HtmlTextWriter hw = new HtmlTextWriter(sw);

this.Page.RenderControl(hw);(Exception occurs here)

StringReader sr = new StringReader(sw.ToString());

Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);

HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

pdfDoc.Open();

htmlparser.Parse(sr);

pdfDoc.Close();

Response.Write(pdfDoc);

Response.End();

}

 

Attached the codebehind and aspx pages.

 

Request you to help me in finding the sloution 

 

Thanks and Regards,

Santosh Kumar 

 

Answer 1

Hello 

 

Type following line in OnPrerender method :

 

base.OnPreRender(e);

It may occur also if scriptmanager is not placed properly :

 

Add scriptmanager in oninit event of webpart 

 

Thanks 

Answer 2

Hello

 

Try to put inside button click event if possible 

 

Thanks 

Answer 3

Hello 

 

You can write this within pageload event , so that it will register before you use it

 

Thanks 

Answer 4

Hello

 

Following code working for me :

 

ScriptManager sm = ScriptManager.GetCurrent(Page);
sm.RegisterScriptControl(control_name);

Than make it visible :

 

control_name.Visible = true;

Thanks 

Answer 5

You can try to use Spire.Doc to convert aspx page to pdf. The code is like the following:

Document document = new Document();
            using (MemoryStream buffer = new MemoryStream())
            {
                using (TextWriter writer = new StreamWriter(buffer, Encoding.UTF8))
                {
                    using (HtmlTextWriter htmlWriter = new HtmlTextWriter(writer))
                    {
                        this.RenderControl(htmlWriter);
                        htmlWriter.Flush();
                        writer.Flush();
                        buffer.Position = 0;

                        string stylesheet = "Default.css";
                        using (StreamReader reader = new System.IO.StreamReader(buffer, Encoding.UTF8))
                        {
                            String baseHref = Request.Url.AbsoluteUri;
                            document.LoadHTML(reader, baseHref, Spire.Doc.Documents.XHTMLValidationType.None);
                            document.HtmlExportOptions.CssStyleSheetType = CssStyleSheetType.External;
                            document.HtmlExportOptions.CssStyleSheetFileName = stylesheet;
                            document.SaveToFile("Test.pdf", Spire.Doc.FileFormat.PDF, Response, HttpContentType.Attachment);
                        }
                    }
                }
            }

Answer 6

Hi Manav,

 

Done the changes as you mentioned but still getting the same error.

 

Thanks 

Answer 7

Hi Manav,

 

Yes, even tried by keeping these 3 lines of code in button_click event.

 

But still  getting the same error

 

ScriptControl UpdateProgress1 is not registered. 

 

Thanks 

Answer 8

Hi Manav,

 

When I add the below three lines in page_load event

 

ScriptManager sm = ScriptManager.GetCurrent(Page);

sm.RegisterScriptControl(UpdateProgress1);

UpdateProgress1.Visible = true;

 

I am getting the below error

 

Script controls may not be registered before PreRender.

 

So added it under OnPrerender event but then the same error 

 

UpdateProgress1 Control is not registered error comming.

 

Am i missing any thing.

 

If possible please check my code behind and aspx pages attached to this post 

 

Thanks 

 

 

Answer 9

Hi Manav,

 

Where exactly i need to add these 2 lines of code .

 

Do i need to add these lines in button_click functionality of my .cs file?

 

Thanks