asp.net – 带有iTextSharp的页眉,页脚和大表

我在PdfPageEventHelper的文档中添加了页眉和页脚.

该文档在运行时填充了几个“大”表.

我试图简单地通过“documen.Add(table)”添加这些表,但我的页眉和页脚结果被覆盖了.

我已经尝试过两种方法来添加表格(WriteSelectedRows和document.Add(myPdfPtable)).

这是PageEventHelper的代码：

private class MyPageEventHandler : PdfPageEventHelper
{
        public iTextSharp.text.Image ImageHeader { get; set; }
        public iTextSharp.text.Image ImageFooter { get; set; }

        public override void OnEndPage(PdfWriter writer,Document document)
        {
            var fontintestazione = FontFactory.GetFont("Verdana",10,Font.BOLD,BaseColor.LIGHT_GRAY);
            var fontRight = FontFactory.GetFont("Verdana",8,BaseColor.WHITE);
            var fontFooter = FontFactory.GetFont("Verdana",6,Font.NORMAL,BaseColor.BLUE);
            float cellHeight = document.TopMargin;
            Rectangle page = document.PageSize;
            PdfPTable head = new PdfPTable(3);
            head.TotalWidth = page.Width;

            PdfPCell c = new PdfPCell(ImageHeader,true);
            c.HorizontalAlignment = Element.ALIGN_LEFT;
            c.FixedHeight = cellHeight;
            c.Border = PdfPCell.NO_BORDER;
            head.AddCell(c);
             c = new PdfPCell(new Phrase("somePhrase",fontintestazione));
            c.Border = PdfPCell.NO_BORDER;
            head.AddCell(c);
            c = new PdfPCell(new Phrase("someTextBlah",fontRight));
            c.Border = PdfPCell.NO_BORDER;
            c.HorizontalAlignment = 1;
            c.BackgroundColor = new BaseColor(70,130,180);
            head.AddCell(c);
            head.WriteSelectedRows(0,-1,page.Height - cellHeight + head.TotalHeight -30,writer.DirectContent);

            PdfPTable footer = new PdfPTable(2);
            footer.TotalWidth = 316f;
            float[] cfWidths = new float[] { 2f,1f };
            footer.SetWidths(cfWidths);
            PdfPCell cf = new PdfPCell(ImageFooter,true);
            cf.HorizontalAlignment = Element.ALIGN_RIGHT;
            cf.FixedHeight = cellHeight;
            cf.Border = PdfPCell.NO_BORDER;
            footer.AddCell(cf);
            cf = new PdfPCell(new Phrase("someEndingText",fontFooter));
            cf.HorizontalAlignment = Element.ALIGN_LEFT;
            cf.Border = PdfPCell.NO_BORDER;
            footer.AddCell(cf);
            footer.WriteSelectedRows(0,50,writer.DirectContent);
        }

在我的页面上,我只是这样做：

var document = new Document(PageSize.A4);

                var output = new MemoryStream();
                var writer = PdfWriter.GetInstance(document,output);
                iTextSharp.text.Image imageHeader = iTextSharp.text.Image.GetInstance(Server.MapPath("/images/header.ong"));
                iTextSharp.text.Image imageFooter = iTextSharp.text.Image.GetInstance(Server.MapPath("/images/footer.png"));
                MyPageEventHandler eve = new MyPageEventHandler
                {
                    ImageHeader = imageHeader,ImageFooter = imageFooter
                };
                writer.PageEvent = eve;
                document.Open();
//adding a table
PdfPTable cvTable = new PdfPtable(3);
cvTable.TotalWidth = document.PageSize.Width;
PdfPCell hCell = new PdfPCell(new Phrase("Jobs By User",aCustomFont));
cvTable.AddCell(hCell);
for(int i = 0; i < myTable.Records.Count; i++)
{
    PdfPCell idCell = new PdfPCell(new Phrase(myTable.Records[i]._id,aFont));
    cvTable.Add(idCell);
    //same stuff for other fields of table
}
//first attempt.... failed:
document.Add(cvTable) //<- header and footer are overwritten by table
//second attempt..... failed too...
cvTable.WriteSelectedRows(0,myPoisition,writer.DirectContent);
//kind of fail...:
//the table is large and need more pages. It is trunked on the first page and overwrite
//the footer.

解决方法

head.WriteSelectedRows(0,page.Height - cellHeight + head.TotalHeight - 30,writer.DirectContent);

该代码根据页面的高度和上边距正确计算放置内容的位置,但也包含一个神奇的30,这导致标题绘制在表格的顶部.将其更改为此标题即可.

head.WriteSelectedRows(0,page.Height - cellHeight + head.TotalHeight,writer.DirectContent);

我猜这30是试图在你的标题和表本身之间加入一些填充.我建议实际上是在主代码中更改文档的边距：

document.SetMargins(document.LeftMargin,document.RightMargin,document.TopMargin + 30,document.BottomMargin);

然后在OnEndPage方法中计算：

float cellHeight = document.TopMargin - 30;

您的页脚代码实际上并不考虑底部边距,只是将其绘制为50,因此这将始终重叠.快速解决方法是将其更改为：

footer.WriteSelectedRows(0,footer.TotalHeight,writer.DirectContent);

这至少会使页脚底部对齐.如果你想要一些像上面那样的填充,只需再次调整文档边距：

document.SetMargins(document.LeftMargin,document.BottomMargin + 30);

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