Question

我使用.x网络应用程序使用itextsharp进行pdf生成。我使用nuget包Install-Package iTextSharp -Version 5.5.10安装了以下版本的itextsharp。我看过样品并开发了用于生成pdf的代码示例，它正在运行。但是我无法理解或将页眉页脚添加到pdf中。这是我正在使用的示例代码

public class Header : PdfPageEventHelper
{
    protected Phrase header;

    public void setHeader(Phrase header)
    {
        this.header = header;
    }

    public void onEndPage(PdfWriter writer, Document document)
    {
        PdfContentByte canvas = writer.DirectContent;
        ColumnText.ShowTextAligned(canvas, Element.ALIGN_RIGHT, header, 559, 806, 0);
    }
}   


Document pdfReport = null;
MemoryStream msReport = new MemoryStream();
PdfWriter pdfWriter = PdfWriter.GetInstance(pdfReport, msReport);

if (!string.IsNullOrEmpty(HeaderText))
{
    Header objHeaderFooter = new Header();  
    //Here i need to assign the string HeaderText to Header. I dont know how to do it.                 
}

请帮助了解如何使用itextSharp分配HeaderText。大多数开发人员的例子都是关于java的但我正在使用.net c＃。

Answer 1

您想在{/ p>中将HeaderText分配给objHeaderFooter

if (!string.IsNullOrEmpty(HeaderText))
{
    Header objHeaderFooter = new Header();  
    //Here i need to assign the string HeaderText to Header. I dont know how to do it.                 
}

假设HeaderText为字符串，您可以使用Header方法setHeader执行此操作：

objHeaderFooter.setHeader(new Phrase(HeaderText));

此外，您必须将objHeaderFooter分配给PdfWriter实例：

pdfWriter.PageEvent = objHeaderFooter;

因此：

if (!string.IsNullOrEmpty(HeaderText))
{
    Header objHeaderFooter = new Header();  
    objHeaderFooter.setHeader(new Phrase(HeaderText));
    pdfWriter.PageEvent = objHeaderFooter;
}

此外，每当您覆盖c＃中的方法时，请将其标记为override。特别是在页面事件监听器中，使用

public override void onEndPage(PdfWriter writer, Document document)

这很容易忘记，特别是在移植java示例时，因为在java中相应的标记@Override是可选的。

以下是操作<。p>提供的示例代码

Response.Clear();
            Response.Buffer = true;
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment; filename=abc.pdf");
            Response.Charset = "";            
            Response.BinaryWrite(getbinary());
            Response.End();  

  public byte[] getbinary()
        {
            Document pdfReport = null;
            pdfReport = new Document(PageSize.A4, 25, 25, 40, 25);
            MemoryStream msReport = new MemoryStream();
            PdfWriter pdfWriter = PdfWriter.GetInstance(pdfReport, msReport);

            pdfReport.Open();

            if (!string.IsNullOrEmpty("Header Text"))
            {
                Header objHeaderFooter = new Header();
                objHeaderFooter.SetHeader(new Phrase("Header Text"));
                pdfWriter.PageEvent = objHeaderFooter;
            }

            PdfPTable ptData1 = new PdfPTable(1);
            ptData1.SpacingBefore = 8;
            ptData1.DefaultCell.Padding = 1;
            ptData1.WidthPercentage = 100;
            ptData1.DefaultCell.HorizontalAlignment = Element.ALIGN_CENTER;
            ptData1.DefaultCell.VerticalAlignment = Element.ALIGN_MIDDLE;

            PdfPCell cell1 = new PdfPCell();
            cell1.BorderWidth = 0.001F;
            cell1.BackgroundColor = new BaseColor(250, 250, 250);
            cell1.BorderColor = new BaseColor(100, 100, 100);
            cell1.Phrase = new Phrase("Sample text");
            ptData1.AddCell(cell1);


            PdfPCell cell = new PdfPCell();
            cell.BorderWidth = 0.001F;
            cell.BackgroundColor = new BaseColor(200, 200, 200);
            cell.BorderColor = new BaseColor(100, 100, 100);

            cell.Phrase = new Phrase("test value");
            ptData1.AddCell(cell);
            pdfReport.Add(ptData1);

            pdfReport.Close();
            return  msReport.ToArray();

        }

public class Header : PdfPageEventHelper
    {
        protected Phrase header;

        public void SetHeader(Phrase header)
        {
            this.header = header;
        }

        public void onEndPage(PdfWriter writer, Document document)
        {
            PdfContentByte canvas = writer.DirectContent;
            ColumnText.ShowTextAligned(canvas, Element.ALIGN_RIGHT, header, 559, 806, 0);
        }
    }

Answer 2

可能这可以用作解决方法。添加标头作为另一个单元格值以下是代码

boolean twice;

@Override
public void onBackPressed() {
    if(twice) {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_HOME);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        finish();
        System.exit(0);
    }
    twice = true;
    toastMessage(getResources().getString(R.string.msg0a));
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            twice = false;
        }
    }, 2000);
}

使用c＃使用itextsharp的页眉和页脚

2 个答案: