//創(chuàng)建PDF文檔
PdfDocument pdf = new PdfDocument();
//添加一個新頁面
PdfPageBase page = pdf.Pages.Add(PdfPageSize.A4, new PdfMargins());
//添加文本到頁面
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS", 10f), true);
page.Canvas.DrawString("年齡:", font, PdfBrushes.DeepSkyBlue, 10, 50);
//創(chuàng)建文本域并指定文本域的名稱
PdfTextBoxField textbox = new PdfTextBoxField(page, "Age");  
//設(shè)置文本域的大小、位置、字體
textbox.Bounds = new RectangleF(40, 50, 50, 12);  
textbox.Font = font;
//添加文本域到文檔
pdf.Form.Fields.Add(textbox);
//保存文檔
pdf.SaveToFile("Fields.pdf");

//設(shè)置邊框
textbox.BorderWidth = 0.75f;
textbox.BorderStyle = PdfBorderStyle.Solid;
textbox.BorderColor = Color.Black;
//設(shè)置背景色
textbox.BackColor = Color.Yellow;
//設(shè)置字體顏色
textbox.ForeColor = Color.Red;
//設(shè)置字體排列方式 
textbox.TextAlignment = PdfTextAlignment.Center;

//指定輸入數(shù)據(jù)在1-100之間
string js = PdfJavaScript.GetRangeValidateString(true, 1, true, 100);
PdfJavaScriptAction jsAction = new PdfJavaScriptAction(js);
textbox.Actions.Validate = jsAction;

//創(chuàng)建簽名域并指定域名
PdfSignatureField signaturefield = new PdfSignatureField(page, "Signature");
//設(shè)置域的邊框
signaturefield.BorderWidth = 1.0f;
signaturefield.BorderStyle = PdfBorderStyle.Solid;
signaturefield.BorderColor = new PdfRGBColor(System.Drawing.Color.Black);
//設(shè)置高亮模式
signaturefield.HighlightMode = PdfHighlightMode.Outline;
//設(shè)置大小與位置
signaturefield.Bounds = new RectangleF(40, 150, 200, 100);
//將簽名域添加到頁面
pdf.Form.Fields.Add(signaturefield);

//加載PDF文檔
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("Fields.pdf");
//獲取第一頁
PdfPageBase page = pdf.Pages[0];
//獲取文檔的所有域
PdfFormWidget form = pdf.Form as PdfFormWidget;
//填充第一個文本域
PdfTextBoxFieldWidget textboxField = form.FieldsWidget[0] as PdfTextBoxFieldWidget;
textboxField.Text = "25";
//填充第二個簽名域
PdfSignatureFieldWidget signatureField = form.FieldsWidget[1] as PdfSignatureFieldWidget;
String pfxPath = @"gary.pfx";
PdfCertificate digi = new PdfCertificate(pfxPath, "123456");   
PdfSignature signature = new PdfSignature(pdf, page, digi, "demo", signatureField);
signature.IsTag = true;
signature.DigitalSigner = "Gary";
signature.ConfigGraphicType = ConfiguerGraphicType.TextSignInformation;
//保存文檔
pdf.SaveToFile("Fill.pdf");