如何在pdf文档的所有页面上插入背景图片？

Question

我需要C＃中的示例代码在完成的pdf文档的所有页面上插入背景图像。我正在使用iTextSharp库。

Answer 1

你可以试试这个;

void makePDF() 
{ 
    Response.ContentType = "application/pdf"; 

    Response.AddHeader("content-disposition", "attachment;filename=test.pdf"); 

    Response.Cache.SetCacheability(HttpCacheability.NoCache); 

    string imageFilePath = Server.MapPath(".") + "/images/test.jpg"; 

    iTextSharp.text.Image jpg = iTextSharp.text.Image.GetInstance(imageFilePath); 

    // Page site and margin left, right, top, bottom is defined 
    Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f); 

    //Resize image depend upon your need 
    //For give the size to image 
    jpg.ScaleToFit(3000, 770); 

    //If you want to choose image as background then, 

    jpg.Alignment = iTextSharp.text.Image.UNDERLYING; 

    //If you want to give absolute/specified fix position to image. 
    jpg.SetAbsolutePosition(7, 69); 

    PdfWriter.GetInstance(pdfDoc, Response.OutputStream); 

    pdfDoc.Open(); 

    pdfDoc.NewPage(); 

    Paragraph paragraph = new Paragraph("this is the testing text for demonstrate the image is in background \n\n\n this is the testing text for demonstrate the image is in background"); 

    pdfDoc.Add(jpg); 

    pdfDoc.Add(paragraph); 

    pdfDoc.Close(); 

    Response.Write(pdfDoc); 

    Response.End(); 
}