iTextsharp、PdfPCell.VerticalAlignment 和 PdfPCell.Horizo​​ntalAlignment

Question

我试图弄清楚如何让我的文本在 PdfPCell 中显示在中间。我尝试了许多不同的选项，例如：

myCell.VerticalAlignment = Element.ALIGN_MIDDLE; myCell.VerticalAlignment = PdfPCell.ALIGN_MIDDLE; myCell.VerticalAlignment = Rectangle.ALIGN_MIDDLE;

这些都不适合我。 VerticalAlignment 需要一个 int，所以我尝试做一个循环，看看我是否能找到正确的数字，但一切都只是左下对齐..

   Document myDocument = new Document(PageSize.A4);

   PdfWriter myPdfWriter = PdfWriter.GetInstance(myDocument, new FileStream(strPDFFilePath, FileMode.Create));
   myDocument.Open();

   myDocument.NewPage();

   PdfContentByte myPdfContentByte = myPdfWriter.DirectContent;

   PdfPCell myCell;
   Paragraph myParagraph;

   PdfPTable myTable = new PdfPTable(4);
   myTable.WidthPercentage = 100;
   myTable.SetWidths(new int[4] { 25, 25, 25, 25 });

   myTable.DefaultCell.BorderWidth = 1;
   myTable.DefaultCell.BorderColor = BaseColor.RED;                

   for (int i = -100; i < 100; i++)
   {
       myParagraph = new Paragraph(String.Format("Alignment: {0}", i));
       myParagraph.Font.SetFamily("Verdana");
       myParagraph.Font.SetColor(72, 72, 72);
       myParagraph.Font.Size = 11;

       myCell = new PdfPCell();
       myCell.AddElement(myParagraph);
       myCell.HorizontalAlignment = i;
       myCell.VerticalAlignment = i;                    
       myTable.AddCell(myCell);
   }

   myDocument.Add(myTable);
   myDocument.Add(new Chunk(String.Empty));
   myDocument.Close();

Answer 1

我认为您遇到的基本问题是您将文本添加到 iTextSharp Paragraph 对象，然后尝试使用包含它的 PdfPCell 对象设置此文本的对齐方式。我不确定PdfPCell.VerticalAlignment 属性是否仅适用于PdfPCell 的文本，或者在PdfPCell 内对齐Paragraph 对象是否不会对您在测试中看到的任何影响。

您还将myCell.HorizontalAlignment 和myCell.VerticalAlignment 设置为for 循环中的索引值。我认为您的意思是使用 i 的 1 次插入。

无论如何，设置 PdfPCell 的 HorizontalAlignment 和 VerticalAlignment 属性确实有效。下面是一个演示这一点的小方法。我根据您要执行的操作非常松散地写了它；如果它与您尝试做的事情足够接近，也许您可​​以将其作为项目的起点。

private void TestTableCreation() {
    using (FileStream fs = new FileStream("TableTest.pdf", FileMode.Create)) {
        Document doc = new Document(PageSize.A4);
        PdfWriter.GetInstance(doc, fs);
        doc.Open();

        PdfPTable table = new PdfPTable(4);

        for (int i = -100; i < 100; i++) {
            PdfPCell cell = new PdfPCell(new Phrase(String.Format("Alignment: {0}", i)));
            // Give our rows some height so we can see test vertical alignment.
            cell.FixedHeight = 30.0f;

            // ** Try it **
            //cell.HorizontalAlignment = Element.ALIGN_LEFT;
            //cell.HorizontalAlignment = Element.ALIGN_CENTER;
            cell.HorizontalAlignment = Element.ALIGN_RIGHT;

            cell.VerticalAlignment = Element.ALIGN_TOP;
            //cell.VerticalAlignment = Element.ALIGN_MIDDLE;
            //cell.VerticalAlignment = Element.ALIGN_BOTTOM;

            table.AddCell(cell);
        }

        doc.Add(table);
        doc.Close();
    }
}

Answer 2

请使用给定的代码，我希望我对那些想要在单元格中打印文本的人最有帮助 protected void Page_Load(object sender, EventArgs e) { 可获取（）； }

    void gettable()
    {
        using (FileStream fs = new FileStream(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Vedic-Chart-Life-Report.pdf"), FileMode.Create, FileAccess.Write, FileShare.Read))
        {

            Document doc = new Document(PageSize.LETTER);
            PdfWriter writer = PdfWriter.GetInstance(doc, fs);
            doc.Open();
            doc.NewPage();

            BaseFont bf = BaseFont.CreateFont("C:/WINDOWS/Fonts/krdv010.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            Font f = new Font(bf, 16, Font.BOLD);

            PdfContentByte cb = writer.DirectContent;

            cb.MoveTo(0, doc.PageSize.Height - 20);
            cb.LineTo(doc.PageSize.Width, doc.PageSize.Height - 20);
            cb.Stroke();
            cb.ClosePathStroke();

            PdfPTable table = new PdfPTable(1);
            PdfPCell cell = new PdfPCell(new Phrase("eaxynks'k foospu", f));

            // Give our rows some height so we can see test vertical alignment.
            cell.FixedHeight = 15f;
            cell.HorizontalAlignment = 1;
            cell.VerticalAlignment = Element.ALIGN_TOP;

            table.AddCell(cell);
            doc.Add(table);

            //cb.RoundRectangle(10f, 550f, 592f, 200f, 20f);
            //cb.Stroke();

            //doc.Add(new Phrase("eaxynks'k foospu", f));

            doc.Close();
        }

    }

Answer 3

当我添加时，Jay Riggs 解决方案也开始适用于垂直对齐：

cell.UseAscender = true;

http://www.afterlogic.com/mailbee-net/docs-itextsharp/html/0602b79e-ea9c-0c7d-c4b2-bc4b5f976f15.htm

Answer 4

我尝试给出这里提到的直接整数和其他解决方案。但没有什么对我有用。这在组合方法中对我有用。

cell.HorizontalAlignment = Element.ALIGN_CENTER;
cell.VerticalAlignment = Element.ALIGN_MIDDLE;