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我想在表中设置PdfpCell的宽度,我想设计一下

我写这段代码

  PdfPCell cell;
            PdfGrid tableHeader;
            PdfGrid tmpTable;
            PdfGrid table = new PdfGrid(numColumns: 1) { WidthPercentage = 100, RunDirection = PdfWriter.RUN_DIRECTION_LTR, ExtendLastRow = false };

            string imagepath2 = HttpRuntime.AppDomainAppPath + "Header.JPG";
            cell = new PdfPCell() { Border = 0, RunDirection = PdfWriter.RUN_DIRECTION_RTL };
            cell.Image = iTextSharp.text.Image.GetInstance(imagepath2);
            table.AddCell(cell);


            tableHeader = new PdfGrid(numColumns: 10);
            tableHeader.RunDirection = PdfWriter.RUN_DIRECTION_LTR;

            tmpTable = new PdfGrid(numColumns: 1);
            tmpTable.TotalWidth = 10f;
            tmpTable.LockedWidth = true;
            cell = new PdfPCell() {Rotation =-90,VerticalAlignment =Element.ALIGN_MIDDLE, HorizontalAlignment =Element.ALIGN_CENTER, BorderWidth = 1};
            cell.Phrase = …