翻譯|使用教程|編輯:李顯亮|2020-07-24 10:26:54.470|閱讀 453 次
概述:在本系列教程中,將為開發(fā)者帶來Aspose.PDF for .NET的一系列使用教程,例如進(jìn)行文檔間的轉(zhuǎn)換,如何標(biāo)記PDF文件,如何使用表單和圖表等等。本文將介紹如何在PDF文檔中添加、修改和刪除表單字段。
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Aspose.PDF for .NET是一種高PDF處理和解析API,用于在跨平臺應(yīng)用程序中執(zhí)行文檔管理和操作任務(wù)。API可以輕松用于生成、修改、轉(zhuǎn)換、渲染、保護(hù)和打印PDF文檔,而無需使用Adobe Acrobat。此外,API還提供PDF壓縮選項,表格創(chuàng)建和操作,圖形和圖像功能,廣泛的超鏈接功能,印章和水印任務(wù),擴(kuò)展的安全控制和自定義字體處理。
在接下來的系列教程中,將為開發(fā)者帶來Aspose.PDF for .NET的一系列使用教程,例如進(jìn)行文檔間的轉(zhuǎn)換,如何標(biāo)記PDF文件,如何使用表單和圖表等等。本文將介紹如何在PDF文檔中添加、修改和刪除表單字段。
>>Aspose.PDF for .NET更新至最新版v20.7,歡迎下載體驗。
要添加表單字段:
以下示例顯示了如何添加TextBoxField。
// The path to the documents directory. string dataDir = RunExamples.GetDataDir_AsposePdf_Forms(); // Open document Document pdfDocument = new Document(dataDir + "TextField.pdf"); // Create a field TextBoxField textBoxField = new TextBoxField(pdfDocument.Pages[1], new Aspose.Pdf.Rectangle(100, 200, 300, 300)); textBoxField.PartialName = "textbox1"; textBoxField.Value = "Text Box"; // TextBoxField.Border = new Border( Border border = new Border(textBoxField); border.Width = 5; border.Dash = new Dash(1, 1); textBoxField.Border = border; textBoxField.Color = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Green); // Add field to the document pdfDocument.Form.Add(textBoxField, 1); dataDir = dataDir + "TextBox_out.pdf"; // Save modified PDF pdfDocument.Save(dataDir);
以下代碼段顯示了使用三個選項添加RadioButtonField并將其放置在Table單元格中的步驟。
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
// Instantiate Document object
Document pdfDocument = new Document();
// Add a page to PDF file
pdfDocument.Pages.Add();
// Instatiate RadioButtonField object with page number as argument
RadioButtonField radio = new RadioButtonField(pdfDocument.Pages[1]);
// Add first radio button option and also specify its origin using Rectangle object
radio.AddOption("Test", new Rectangle(0, 0, 20, 20));
// Add second radio button option
radio.AddOption("Test1", new Rectangle(20, 20, 40, 40));
// Add radio button to form object of Document object
pdfDocument.Form.Add(radio);
dataDir = dataDir + "RadioButton_out.pdf";
// Save the PDF file
pdfDocument.Save(dataDir);
以下代碼段顯示了如何在PDF文檔中添加RadioButtonField。
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
Document doc = new Document();
Page page = doc.Pages.Add();
Aspose.Pdf.Table table = new Aspose.Pdf.Table();
table.ColumnWidths = "120 120 120";
page.Paragraphs.Add(table);
Row r1 = table.Rows.Add();
Cell c1 = r1.Cells.Add();
Cell c2 = r1.Cells.Add();
Cell c3 = r1.Cells.Add();
RadioButtonField rf = new RadioButtonField(page);
rf.PartialName = "radio";
doc.Form.Add(rf, 1);
RadioButtonOptionField opt1 = new RadioButtonOptionField();
RadioButtonOptionField opt2 = new RadioButtonOptionField();
RadioButtonOptionField opt3 = new RadioButtonOptionField();
opt1.OptionName = "Item1";
opt2.OptionName = "Item2";
opt3.OptionName = "Item3";
opt1.Width = 15;
opt1.Height = 15;
opt2.Width = 15;
opt2.Height = 15;
opt3.Width = 15;
opt3.Height = 15;
rf.Add(opt1);
rf.Add(opt2);
rf.Add(opt3);
opt1.Border = new Border(opt1);
opt1.Border.Width = 1;
opt1.Border.Style = BorderStyle.Solid;
opt1.Characteristics.Border = System.Drawing.Color.Black;
opt1.DefaultAppearance.TextColor = System.Drawing.Color.Red;
opt1.Caption = new TextFragment("Item1");
opt2.Border = new Border(opt1);
opt2.Border.Width = 1;
opt2.Border.Style = BorderStyle.Solid;
opt2.Characteristics.Border = System.Drawing.Color.Black;
opt2.DefaultAppearance.TextColor = System.Drawing.Color.Red;
opt2.Caption = new TextFragment("Item2");
opt3.Border = new Border(opt1);
opt3.Border.Width = 1;
opt3.Border.Style = BorderStyle.Solid;
opt3.Characteristics.Border = System.Drawing.Color.Black;
opt3.DefaultAppearance.TextColor = System.Drawing.Color.Red;
opt3.Caption = new TextFragment("Item3");
c1.Paragraphs.Add(opt1);
c2.Paragraphs.Add(opt2);
c3.Paragraphs.Add(opt3);
dataDir = dataDir + "RadioButtonWithOptions_out.pdf";
// Save the PDF file
doc.Save(dataDir);
以下代碼段顯示了如何添加與RadioButtonField關(guān)聯(lián)的標(biāo)題:
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
// Load source PDF form
Aspose.Pdf.Facades.Form form1 = new Aspose.Pdf.Facades.Form(dataDir + "RadioButtonField.pdf");
Document PDF_Template_PDF_HTML = new Document(dataDir + "RadioButtonField.pdf");
foreach (var item in form1.FieldNames)
{
Console.WriteLine(item.ToString());
Dictionary radioOptions = form1.GetButtonOptionValues(item);
if (item.Contains("radio1"))
{
Aspose.Pdf.Forms.RadioButtonField field0 = PDF_Template_PDF_HTML.Form[item] as Aspose.Pdf.Forms.RadioButtonField;
Aspose.Pdf.Forms.RadioButtonOptionField fieldoption = new Aspose.Pdf.Forms.RadioButtonOptionField();
fieldoption.OptionName = "Yes";
fieldoption.PartialName = "Yesname";
var updatedFragment = new Aspose.Pdf.Text.TextFragment("test123");
updatedFragment.TextState.Font = FontRepository.FindFont("Arial");
updatedFragment.TextState.FontSize = 10;
updatedFragment.TextState.LineSpacing = 6.32f;
// Create TextParagraph object
TextParagraph par = new TextParagraph();
// Set paragraph position
par.Position = new Position(field0.Rect.LLX, field0.Rect.LLY + updatedFragment.TextState.FontSize);
// Specify word wraping mode
par.FormattingOptions.WrapMode = TextFormattingOptions.WordWrapMode.ByWords;
// Add new TextFragment to paragraph
par.AppendLine(updatedFragment);
// Add the TextParagraph using TextBuilder
TextBuilder textBuilder = new TextBuilder(PDF_Template_PDF_HTML.Pages[1]);
textBuilder.AppendParagraph(par);
field0.DeleteOption("item1");
}
}
PDF_Template_PDF_HTML.Save(dataDir + "RadioButtonField_out.pdf");
以下代碼段顯示了如何在PDF文檔中添加ComboBox字段。
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
// Create Document object
Document doc = new Document();
// Add page to document object
doc.Pages.Add();
// Instantiate ComboBox Field object
ComboBoxField combo = new ComboBoxField(doc.Pages[1], new Aspose.Pdf.Rectangle(100, 600, 150, 616));
// Add option to ComboBox
combo.AddOption("Red");
combo.AddOption("Yellow");
combo.AddOption("Green");
combo.AddOption("Blue");
// Add combo box object to form fields collection of document object
doc.Form.Add(combo);
dataDir = dataDir + "ComboBox_out.pdf";
// Save the PDF document
doc.Save(dataDir);
要修改現(xiàn)有的表單字段,您可以從Form集合中獲取該字段并設(shè)置其屬性。然后保存更新的PDF文檔。以下代碼段顯示了如何修改PDF文檔中的現(xiàn)有表單字段。
// The path to the documents directory. string dataDir = RunExamples.GetDataDir_AsposePdf_Forms(); // Open document Document pdfDocument = new Document(dataDir + "ModifyFormField.pdf"); // Get a field TextBoxField textBoxField = pdfDocument.Form["textbox1"] as TextBoxField; // Modify field value textBoxField.Value = "New Value"; textBoxField.ReadOnly = true; dataDir = dataDir + "ModifyFormField_out.pdf"; // Save updated document pdfDocument.Save(dataDir);
所有表單字段都包含在Document對象的Form集合中。該集合提供了管理表單字段的不同方法,包括該Delete方法。如果要刪除特定字段,請將字段名稱作為參數(shù)傳遞給Delete方法,然后保存更新的PDF文檔。以下代碼段顯示了如何從PDF文檔中刪除特定字段。
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();
// Open document
Document pdfDocument = new Document(dataDir + "DeleteFormField.pdf");
// Delete a particular field by name
pdfDocument.Form.Delete("textbox1");
dataDir = dataDir + "DeleteFormField_out.pdf";
// Save modified document
pdfDocument.Save(dataDir);
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