Question

我正在尝试使用ITextEvent

为我的PDF添加页眉和页脚

我的OnEndPage方法如下所示。

以下一行：

pdfTab.AddCell(pdfCell3);

抛出错误“对象引用未发送到对象的实例”

如果我不添加第3个单元格，则其他两个单元格会正常添加并且pdf会正确呈现。

public override void OnEndPage(iTextSharp.text.pdf.PdfWriter writer, iTextSharp.text.Document document)
{
     base.OnEndPage(writer, document);

    BaseFont Calibri = BaseFont.CreateFont(@"C:\windows\fonts\calibri.ttf", BaseFont.CP1252, BaseFont.EMBEDDED);
    BaseFont CalibriBold = BaseFont.CreateFont(@"C:\windows\fonts\calibrib.ttf", BaseFont.CP1252, BaseFont.EMBEDDED);

    Font baseFontSmall = new Font(Calibri, 10, Font.BOLD, Color.BLACK);
     Font baseFontNormal = new Font(Calibri, 12, Font.NORMAL, Color.BLACK);
     Font baseFontBig = new Font(CalibriBold, 12, Font.BOLD, Color.BLACK);


    Phrase p1Header = new Phrase("Sample Header Here", baseFontNormal);

    //Create PdfTable object
    PdfPTable pdfTab = new PdfPTable(2);


     create separate cells to include image logo and 2 separate strings
    //Row 1
    PdfPCell pdfCell1 = new PdfPCell();
    PdfPCell pdfCell2 = new PdfPCell(new Phrase("Doctors name", baseFontNormal));

    //row2
    PdfPCell pdfCell3 = new PdfPCell(new Phrase("Date and stuff", baseFontNormal));



    pdfCell1.Colspan = 1;
    pdfCell2.Colspan = 1;
    pdfCell3.Colspan = 2;


    String text = "Page " + writer.PageNumber + " of ";


    //Add paging to footer
    {
        cb.BeginText();
        cb.SetFontAndSize(bf, 10);
        cb.SetTextMatrix(document.PageSize.GetRight(180), document.PageSize.GetBottom(30));
        cb.ShowText(text);
        cb.EndText();
        float len = bf.GetWidthPoint(text, 12);
        cb.AddTemplate(footerTemplate, document.PageSize.GetRight(180) + len, document.PageSize.GetBottom(30));
    }



    //set the alignment of all three cells and set border to 0
    pdfCell1.HorizontalAlignment = Element.ALIGN_LEFT;
    pdfCell2.HorizontalAlignment = Element.ALIGN_RIGHT;
    pdfCell3.HorizontalAlignment = Element.ALIGN_RIGHT;
    //pdfCell4.HorizontalAlignment = Element.ALIGN_RIGHT;

    pdfCell2.VerticalAlignment = Element.ALIGN_TOP;
    pdfCell3.VerticalAlignment = Element.ALIGN_BOTTOM;
    pdfCell1.Border = 0;
    pdfCell2.Border = 0;
    pdfCell3.Border = 0;


    //add all three cells into PdfTable
    pdfTab.AddCell(pdfCell1);
    pdfTab.AddCell(pdfCell2);
    pdfTab.AddCell(pdfCell3);

    pdfTab.TotalWidth = document.PageSize.Width - 80f;
    pdfTab.WidthPercentage = 70;



    //call WriteSelectedRows of PdfTable. This writes rows from PdfWriter in PdfTable
    //first param is start row. -1 indicates there is no end row and all the rows to be included to write
    //Third and fourth param is x and y position to start writing
    pdfTab.WriteSelectedRows(0, -1, 40, document.PageSize.Height - 30, writer.DirectContent);
    //set pdfContent value

    //Move the pointer and draw line to separate header section from rest of page
    cb.MoveTo(40, document.PageSize.Height - 100);
    cb.LineTo(document.PageSize.Width - 40, document.PageSize.Height - 100);
    cb.Stroke();

    //Move the pointer and draw line to separate footer section from rest of page
    cb.MoveTo(40, document.PageSize.GetBottom(50));
    cb.LineTo(document.PageSize.Width - 40, document.PageSize.GetBottom(50));
    cb.Stroke();
}

堆栈跟踪

at iTextSharp.text.pdf.PdfPRow.set_RTL(Boolean value)
at iTextSharp.text.pdf.PdfPTable.AddCell(PdfPCell cell)
at ITextEvents.OnEndPage(PdfWriter writer, Document document) in c:\TFS\PSA\Source           Code\App_Code\ITextEvents.cs:line 145

at iTextSharp.text.pdf.PdfDocument.NewPage()
at PhysComp.UI.CreateSummaryReports.WritePdfLine(Tbl_ProvidersRecord NameRecord, PdfContentByte& Cb, BaseFont Font, Int32 FontSize, Int32 Alignment, String text, Int32 xPos, Int32& yindex, Int32 rotation) in c:\TFS\PSA\Source Code\SummaryReport\CreateSummaryReports.aspx.cs:line 346

at PhysComp.UI.CreateSummaryReports.printInvoice(PdfContentByte& Cb, Int32& yindex, Tbl_ProvidersRecord NameRecord, Invoices_By_CheckRecord invoice, Dictionary`2 ChequeAmounts) in c:\TFS\PSA\Source Code\SummaryReport\CreateSummaryReports.aspx.cs:line 295

at PhysComp.UI.CreateSummaryReports.printInvoices(PdfContentByte& Cb, Int32& yindex, Tbl_ProvidersRecord NameRecord, List`1 Invoices, Dictionary`2 ChequeAmounts) in c:\TFS\PSA\Source Code\SummaryReport\CreateSummaryReports.aspx.cs:line 272

 at PhysComp.UI.CreateSummaryReports.CreatePDF(Tbl_ProvidersRecord NameRecord, DateTime StartDate, DateTime EndDate) in c:\TFS\PSA\Source Code\SummaryReport\CreateSummaryReports.aspx.cs:line 133

ITextSharp，不会向PdfPTable添加第二行

0 个答案: