首页> C＃> itext7-如何添加文本到新页面？

Question

I'm creating Pdfs using itext7. It allows me to add paragraphs to first page but I'm not sure how can I add content to second page. If I create Canvas after calling AddNewPage() then it works fine, but it doesn't work when I use a paragraph and I add it to the document. Thanks for help. In my example, firstPageText and secondPageText will be displayed on first page:

protected void CreatePdf(string filePath, string firstPageText, string secondPageText)
   {
       PdfWriter writer = new PdfWriter(filePath);
       PdfDocument pdfDocument = new PdfDocument(writer);
       Document doc = new Document(pdfDocument);

       doc.Add(new Paragraph(firstPageText));
       pdfDocument.AddNewPage();
       doc.Add(new Paragraph(secondPageText)); 

       doc.Close();
   }

Answer 1

This is explained in chapter 2 of the iText 7: Building Blocks . Allow me to copy a snippet of that tutorial:

If we had used an AreaBreak of type NEXT_PAGE , a new page would have been started; see figure 2.11.

In the JekyllHydeV5 example, we changed a single line:

 AreaBreak nextPage = new AreaBreak(AreaBreakType.NEXT_PAGE); 

Instead of skipping to the next column, iText now skips to the next page.

By default, the newly created page will have the same page size as the current page. If you want iText to create a page of another size, you can use the constructor that accepts a PageSize object as a parameter. For instance: new AreaBreak(PageSize.A3) .

There's also an AreaBreak of type LAST_PAGE . This AreaBreakType is to be used when switching between different renderers.

It surprises me that you'd do this:

doc.Add(new Paragraph(firstPageText));
pdfDocument.AddNewPage();
doc.Add(new Paragraph(secondPageText));

While the documented way is to do it like this:

doc.Add(new Paragraph(firstPageText));
doc.Add(new AreaBreak(AreaBreakType.NEXT_PAGE));
doc.Add(new Paragraph(secondPageText));