使用itextsharp(或任何c#pdf库),如何打开PDF,替换一些文本,然后再次保存？

最后,我使用PDFescape打开我现有的PDF文件,并将一些表单字段放在我需要放置字段的位置,然后再次保存以创建我的PDF文件.

http://www.pdfescape.com

然后我找到了关于如何替换表单字段的博客文章：

http://www.johnnycode.com/blog/2010/03/05/using-a-template-to-programmatically-create-pdfs-with-c-and-itextsharp/

一切都很好！这是代码：

public static byte[] Generate()
{
  var templatePath = httpContext.Current.Server.MapPath("~/my_template.pdf");

  // Based on:
  // http://www.johnnycode.com/blog/2010/03/05/using-a-template-to-progrAMMatically-create-pdfs-with-c-and-itextsharp/
  var reader = new PdfReader(templatePath);
  var outStream = new MemoryStream();
  var stamper = new PdfStamper(reader,outStream);

  var form = stamper.AcroFields;
  var fieldKeys = form.Fields.Keys;

  foreach (String fieldKey in fieldKeys)
  {
    if (form.GetField(fieldKey) == "myTemplatesOriginalTextFieldA")
      form.SetField(fieldKey,"1234");
    if (form.GetField(fieldKey) == "myTemplatesOriginalTextFieldB")
      form.SetField(fieldKey,"5678");
  }

  // "Flatten" the form so it wont be editable/usable anymore  
  stamper.FormFlattening = true;  

  stamper.Close();
  reader.Close();

  return outStream.ToArray();
}