PdfPTable构造函数中的列数必须大于零 [英] The number of columns in PdfPTable constructor must be greater than zero

问题描述

我想使用 ItextSharp 将html保存为PDF。我收到此错误： PdfPTable构造函数中的列数必须大于零。

我的代码片段：

I want to save a html as PDF using ItextSharp. I am getting this error:The number of columns in PdfPTable constructor must be greater than zero.
My Code Snippet:

Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=ulcact.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            frmPrintHtml.RenderControl(hw);
            StringReader sr = new StringReader(sw.ToString());
            Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
            PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            pdfDoc.Open();
            htmlparser.Parse(sr);//error occrs in this line
            pdfDoc.Close();
            Response.Write(pdfDoc);
            Response.End();

推荐答案

我认为你的创作顺序是错误的。

I think your order of creation is wrong.

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=ulcact.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
frmPrintHtml.RenderControl(hw);
Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
StringReader sr = new StringReader(sw.ToString());
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
htmlparser.Parse(sr);//error should be gone
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();

Response.ContentType =application / pdf;

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

Response.Cache.SetCacheability（HttpCacheability.NoCache）;

StringWriter sw = new StringWriter（）;

HtmlTextWriter hw = new HtmlTextWriter（sw）;

frmPrintHtml.RenderControl（hw）;

文件pdfDoc =新文件（PageSize.A2,7f，7f， 7f，0f）;

PdfWriter.GetInstance（pdfDoc，Response.OutputStream）;

pdfDoc.Open（）;

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

HTMLWorker htmlparser = new HTMLWorker（pdfDoc）;

htmlparser.Parse（sr）; //错误应该消失

pdfDoc.Close（）;

Response.Write（pdfDoc）;

Response.End（）;





如果您使用此编码，则必须删除（tr td标签），因为您的编码和压缩行和列

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=ulcact.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
frmPrintHtml.RenderControl(hw);
Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
StringReader sr = new StringReader(sw.ToString());
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
htmlparser.Parse(sr);//error should be gone
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();


If You use this coding than you must remove (tr td tag ) in that your coding and compress your row and column

I想想哟ur html内容的表标签没有tr标签。至少需要一行。

I think your html content have the table tag with no tr tag. Minimum one row required.

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