PdfPCellEvent不申请第一个单元格？

Question

此事件未在第一个单元格中调用

 public class pdfCellBorder : IPdfPCellEvent
    {
        public void CellLayout(PdfPCell cell, Rectangle position, PdfContentByte[] canvases)
        {         
            PdfContentByte canvas = canvases[PdfPTable.LINECANVAS];                     
            canvas.SetLineDash(0.5F, 2.2F, 0 );
            canvas.Stroke();       
        }
    }

注释中的代码：

PdfPTable table = new PdfPTable(1);
pdfCellBorder pdfcell = new pdfCellBorder();
table.DefaultCell.CellEvent = pdfcell;
table.DefaultCell.Border = PdfPCell.NO_BORDER;
PdfPCell cell = new PdfPCell(new Phrase("product"));
cell.Border = Rectangle.BOTTOM_BORDER;
cell.CellEvent = pdfcell;
table.AddCell(cell);
cell = new PdfPCell(new Phrase("product"));
// cell.BorderWidthBottom = 1f;
cell.Border = Rectangle.BOTTOM_BORDER;
cell.CellEvent = pdfcell;
table.AddCell(cell);

public class pdfCellBorder : IPdfPCellEvent {
    public void CellLayout(PdfPCell cell, Rectangle position, PdfContentByte[] canvases) {
        PdfContentByte canvas = canvases[PdfPTable.LINECANVAS];
        //canvas.SetLineWidth(0.5F);
        canvas.SetLineDash(0.5F, 2.2F, 0);
        canvas.Rectangle(position.Left, position.Bottom, position.Width, 0);
        canvas.Stroke();
    }
} 

Answer 1

您可以通过两件事来解决此问题。首先，在您的事件中设置实际的Rectangle：

public class pdfCellBorder : IPdfPCellEvent {
    public void CellLayout(PdfPCell cell, iTextSharp.text.Rectangle position, PdfContentByte[] canvases) {
        PdfContentByte canvas = canvases[PdfPTable.LINECANVAS];
        canvas.SetLineDash(0.5F, 2.2F, 0);

        //Set the rectangle to draw on
        canvas.Rectangle(position.Left, position.Bottom, position.Width, position.Height);
        canvas.Stroke();
    }
}

第二，禁用默认单元格上的边框：

var t = new PdfPTable(2);
t.DefaultCell.CellEvent = new pdfCellBorder();

//Disable the border
t.DefaultCell.Border = PdfPCell.NO_BORDER;
t.AddCell("Hello");
t.AddCell("World");

doc.Add(t);

编辑

根据您的评论，您需要一条线，并且只需要在每个单元格的底部绘制一条线。您只想用Rectangle和MoveTo画一条线，而不是LineTo：

public class pdfCellBorder : IPdfPCellEvent {
    public void CellLayout(PdfPCell cell, iTextSharp.text.Rectangle position, PdfContentByte[] canvases) {
        PdfContentByte canvas = canvases[PdfPTable.LINECANVAS];
        canvas.SetLineDash(0.5F, 2.2F, 0);
        //Move the "pen" to where we want to start drawing
        canvas.MoveTo(position.Left, position.Bottom);
        //Draw a straight line
        canvas.LineTo(position.Right, position.Bottom);
        canvas.Stroke();
    }
}

但是，您仍然需要在所有单元格上禁用自动边框。如果在下面设置任何边框，则指示iTextSharp为您绘制边框。另外，由于您正在调用new PdfPCell()，因此我们可以摆脱与DefaultCell

相关的任何内容

PdfPTable table = new PdfPTable(1);
pdfCellBorder pdfcell = new pdfCellBorder();
PdfPCell cell = new PdfPCell(new Phrase("product"));
cell.Border = PdfPCell.NO_BORDER;
cell.CellEvent = pdfcell;
table.AddCell(cell);
cell = new PdfPCell(new Phrase("product"));
cell.Border = PdfPCell.NO_BORDER;
cell.CellEvent = pdfcell;
table.AddCell(cell);

Answer 2

有人使用ironpython来实现PdfPCellEvent吗？当构造Rectangle类型的position时，IronPython需要一个非null参数，“ position = Rectangle（）”语句是错误的。我没有办法，请帮忙。