c# - iTextsharp、PdfPCell.VerticalAlignment 和 PdfPCell.Horizo​​ntalAlignment

Question

我试图弄清楚如何让 PdfPCell 中的文本显示在中间。我尝试了很多不同的选择，例如:

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

None of that works for me. VerticalAlignment takes an int, so I tried to make a loop, to see if i could find the right number, but everything just get left bottom align..

   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 PdfPCell 对象设置此文本的对齐方式包含它。我不确定 PdfPCell.VerticalAlignment 属性是否仅适用于 PdfPCell 的文本，或者是否将 Paragraph 对象对齐 PdfPCell 没有任何影响，您可以在测试中看到。

您还将 myCell.Horizo​​ntalAlignment 和 myCell.VerticalAlignment 设置为 for 循环中的索引值。我认为您打算使用 1 个 i。

无论如何，设置 PdfPCell 的 Horizo​​ntalAlignment 和 VerticalAlignment 属性确实有效。下面是一个演示这一点的小方法。我根据你想做的事情写得非常松散；如果它与您尝试做的事情足够接近，也许您可​​以将其用作项目的起点。

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();
    }
}