使用itextsharp (c#)添加标题到PDF文件-只是新的章节页

本文关键字：-只 文件 PDF itextsharp 添加 标题 使用 | 更新日期: 2023-09-27 17:55:02

我的代码被阻塞了，因为我找不到这个主题的答案。所以我想做的是在新的章节页面上添加一个标题。我已经实现了这一点，但是当添加一个需要两个或更多页面的新表时，我无法将标题添加到我想要的页面。我有以下代码:

在我的main函数中:

            document.NewPage();
            writer.PageEvent = null;
            addHeader(writer, document, chapter3, title3);
            addFooter(writer, document, chapter3, title3);
            table = createVariablesTable();                
            headerOffsetSpace(document);
            addTableHeader(table);
            addTableBody(table, firsPage);
            document.Add(table);
            document.NewPage();
            writer.PageEvent = null;
            addFooter(writer, document, chapter3, title3);
            table = createVariablesTable();
            addTableHeader(table);
            firstPage = false;
            addTableBody(table, firstPage);
            document.Add(table);

地点:

        private void addHeader(PdfWriter writer, Document document, String chapterText, String titleText)
    { 
        Font ArialBold = new Font(Font.FontFamily.HELVETICA, 24, Font.BOLD);
        Font ArialItalic = new Font(Font.FontFamily.HELVETICA, 24, Font.ITALIC);
        Chunk headerChapterChunk = new Chunk(chapterText, ArialItalic);
        Chunk headerTitleChunk = new Chunk(titleText, ArialBold);
        Phrase headerText = new Phrase();
        headerText.Add(headerChapterChunk);
        headerText.Add(headerTitleChunk);
        HeaderPageEvent headerEvent = new HeaderPageEvent() { header = headerText };
        writer.PageEvent = headerEvent;
    }
    private void addFooter(PdfWriter writer, Document document, String chapterText, String titleText)
    {
        Font TimesNewRomanNormal = new Font(Font.FontFamily.TIMES_ROMAN, 10, Font.NORMAL);
        Font TimesNewRomanItalic = new Font(Font.FontFamily.TIMES_ROMAN, 10, Font.ITALIC);
        Chunk footerChapterChunk = new Chunk(chapterText, TimesNewRomanItalic);
        Chunk footerTitleChunk = new Chunk(titleText, TimesNewRomanNormal);
        Phrase footerText = new Phrase();
        footerText.Add(footerChapterChunk);
        footerText.Add(footerTitleChunk);
        FooterPageEvent footerEvent = new FooterPageEvent() { footer = footerText };
        writer.PageEvent = footerEvent;
    }

和类PageEvent是:

class HeaderPageEvent : PdfPageEventHelper
    {
        float marginHorizontal = 42.6f;
        float marginTop = 777;
        float marginTopHeaderSeparator = 738.1f;
        float indentHeaderSeparator = 1.3f;
        float headerLeading = 27.6f;
        public Phrase header { get; set; }
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            iTextSharp.text.Rectangle pageSize = document.PageSize;
            PdfContentByte cb = writer.DirectContent;
            ColumnText columnHeader = new ColumnText(cb);
            columnHeader.SetSimpleColumn(header, marginHorizontal, marginTop + headerLeading, pageSize.Width - 2 * marginHorizontal, 0, headerLeading, Element.ALIGN_LEFT);
            columnHeader.Go();
            ColumnText columnHeaderSeparator = new ColumnText(cb);
            Phrase headerSeparator = new Phrase(new Chunk(new iTextSharp.text.pdf.draw.LineSeparator(0.25f, 100.0f, BaseColor.BLACK, Element.ALIGN_LEFT, 0)));
            columnHeaderSeparator.SetSimpleColumn(headerSeparator, marginHorizontal - indentHeaderSeparator, marginTopHeaderSeparator, pageSize.Width - marginHorizontal, 0, 0, Element.ALIGN_LEFT);
            columnHeaderSeparator.Go();
        }
    }
    class FooterPageEvent : PdfPageEventHelper
    {
        float marginHorizontal = 42.6f;
        float indentFooterSeparator = 1.5f;
        float marginBottomFooter = 37.9f;
        float marginBottomFooterSeparator = 48.2f;
        float pageNumberEvenOffset = 35.4f;
        float pageNumberOddOffset = 28.4f;
        public Phrase footer { get; set; }
        Font TimesNewRomanNormal = new Font(Font.FontFamily.TIMES_ROMAN, 10, Font.NORMAL);
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            iTextSharp.text.Rectangle pageSize = document.PageSize;
            PdfContentByte cb = writer.DirectContent;
            ColumnText columnFooterSeparator = new ColumnText(cb);
            Phrase footerSeparator = new Phrase(new Chunk(new iTextSharp.text.pdf.draw.LineSeparator(0.25f, 100.0f, BaseColor.BLACK, Element.ALIGN_LEFT, 0)));
            columnFooterSeparator.SetSimpleColumn(footerSeparator, marginHorizontal - indentFooterSeparator, 0, pageSize.Width - marginHorizontal + indentFooterSeparator, marginBottomFooterSeparator, 0, Element.ALIGN_LEFT);
            columnFooterSeparator.Go();
            ColumnText columnPageNumber = new ColumnText(cb);
            int pageN = writer.PageNumber;
            Phrase pageNumber = new Phrase(pageN.ToString(), TimesNewRomanNormal);
            ColumnText columnFooter = new ColumnText(cb);
            switch(pageN % 2)
            {
                case 0:
                    columnPageNumber.SetSimpleColumn(pageNumber, marginHorizontal, 0, pageSize.Width, marginBottomFooter, 0, Element.ALIGN_LEFT);
                    columnPageNumber.Go();
                    columnFooter.SetSimpleColumn(footer, marginHorizontal + pageNumberEvenOffset, 0, pageSize.Width, marginBottomFooter, 0, Element.ALIGN_LEFT);
                    columnFooter.Go();
                    break;
                case 1:
                    columnPageNumber.SetSimpleColumn(pageNumber, 0, 0, pageSize.Width - marginHorizontal, marginBottomFooter, 0, Element.ALIGN_RIGHT);
                    columnPageNumber.Go();
                    columnFooter.SetSimpleColumn(footer, 0, 0, pageSize.Width - marginHorizontal - pageNumberOddOffset, marginBottomFooter, 0, Element.ALIGN_RIGHT);
                    columnFooter.Go();
                    break;
            }
        }
    }

所以…像这样做我的代码，它工作正常。我将页眉和页脚事件添加到新的章节页面。然后，我将事件设置为null，并在下一页上再次添加footer事件，对于接下来的页面，文档将始终具有footer事件。这将解决我的问题，但是，有时"addTableBody"函数大于一个页面，所以文档自动添加一个新页面而不清理页面事件，所以它将是如此多的页面与标题一样多的页面表需要显示。有人能帮我吗?我只是想把Header事件添加到新的章节页。

Thanks in advance

使用itextsharp (c#)添加标题到PDF文件-只是新的章节页

为您的HeaderPageEvent添加一个额外的参数:

class HeaderPageEvent : PdfPageEventHelper
{
    boolean ignoreHeader = true;
    float marginHorizontal = 42.6f;
    float marginTop = 777;
    // rest of your code...
}

像这样使用这个额外参数:

public override void OnEndPage(PdfWriter writer, Document document)
{
    if (ignoreHeader) return;
    ignoreHeader = true;
    // rest of your code...
}

通过这样做，您告诉事件仅在ignoreHeader的值为false时显示标题，如果它为假，则立即设置为true。

默认情况下，标题将永远不会显示，这是您想要的。您只希望在需要时显示标题。您可以通过将此方法添加到HeaderPageEvent:

来完成此操作。
void ShowHeader() {
    ignoreHeader = false;
}

您不再需要设置页面事件为null。你现在可以触发showHeader()方法，每次你想要一个标题出现。

HeaderPageEvent event = new HeaderPageEvent();
writer.PageEvent = event;
// Add stuff, no header will be added
event.ShowHeader();
document.NewPage();
// A header will be shown, but only on one page
document.Add(table);

如果您想让标题出现在第一页，您需要将ignoreHeader的默认值更改为false

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