PDF文档通常是不能编辑的，但有些时候需要在PDF文档中填写日期或签名之类，就需要在PDF有能编辑的文本域，本文介绍怎样用C#来实现这一功能。
环境
工具：VS2015
语言：C#
操作PDF类库：iTextSharp 5.5.10
生成的PDF预览的工具：Skim、福昕阅读器、Acrobat Reader
代码实现
获取文档的页数
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PdfReader reader = new PdfReader(@"C:\WorkSpace\1.pdf");
int count = reader.NumberOfPages;
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创建文本域
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TextField fieldDate = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(105, 100, 240, 125), "date");
fieldDate.BackgroundColor= BaseColor.WHITE;fieldDate.BorderWidth= 1;
fieldDate.BorderColor= BaseColor.BLACK;fieldDate.BorderStyle= 4;
fieldDate.FontSize = 11f;
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iTextSharp.text.Rectangle(105, 100, 240, 125) 用来设置文本域的位置，四个参数分别为：llx、lly、urx、ury：
llx 为Left ，lly 为Bottom,urx 为Right，ury 为Top
其中：Width=Right - Left Heigth = Top - Bototom
创建文本
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Chunk cname = new Chunk("Date:", FontFactory.GetFont("Futura", 16f,new BaseColor(170,64,0)));
Phrase pname = new Phrase(cname);
PdfContentByte over = stamp.GetOverContent(count);
ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, pname, 400, 420, 0);
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完整代码
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public static void AddTextField()
{
PdfReader reader = new PdfReader(@"C:\WorkSpace\1.pdf");
FileStream out1 = new FileStream(@"C:\WorkSpace\2.pdf", FileMode.Create, FileAccess.Write);
PdfStamper stamp = new PdfStamper(reader, out1);
//获得pdf总页数
int count = reader.NumberOfPages;
TextField fieldDate = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(105, 100, 240, 125), "date");
fieldDate.BackgroundColor = BaseColor.WHITE;
fieldDate.BorderWidth = 1;
fieldDate.BorderColor = BaseColor.BLACK;
fieldDate.BorderStyle = 4;
fieldDate.FontSize = 11f;
TextField fieldSign = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(430, 100, 530, 125), "sign");
fieldSign.BackgroundColor = BaseColor.WHITE;
fieldSign.BorderWidth = 1;
fieldSign.BorderColor = BaseColor.BLACK;
fieldSign.BorderStyle = 4;
fieldSign.FontSize = 11f;
Chunk cname = new Chunk("Date:", FontFactory.GetFont("Futura", 16f,new BaseColor(170,64,0)));
Chunk ctitle = new Chunk("User Sign:", FontFactory.GetFont("Futura", 16f, new BaseColor(0, 128, 128)));
Phrase pname = new Phrase(cname);
Phrase ptitle = new Phrase(ctitle);
//PdfContentBye类，用来设置图像和文本的绝对位置
PdfContentByte over = stamp.GetOverContent(count);
ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, pname, 400, 420, 0);
ColumnText.ShowTextAligned(over, Element.ALIGN_CENTER, ptitle, 400, 350, 0);
stamp.AddAnnotation(fieldDate.GetTextField(), count);
stamp.AddAnnotation(fieldSign.GetTextField(), count);
stamp.FormFlattening = true;
stamp.Close();
}
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