使用列表项

在现有 PDF 文件中添加列表项

AddListItem 方法允许您在 ListBox 字段中添加项目。第一个参数是字段名称，第二个参数是字段项。您可以传递单个字段项，也可以传递包含项目列表的字符串数组。此方法由 FormEditor 类提供。以下代码片段演示了如何在 PDF 文件中添加列表项。

 // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
 private static void AddListItem()
 {
     // The path to the documents directory
     var dataDir = RunExamples.GetDataDir_AsposePdf();

     // Create an instance of FormEditor to manipulate form fields
     using (var formEditor = new Aspose.Pdf.Facades.FormEditor())
     {
         // Bind PDF document
         formEditor.BindPdf(dataDir + "Sample-Form-01.pdf");

         // Add a ListBox field for selecting country, placed at the specified coordinates on page 1
         formEditor.AddField(Aspose.Pdf.Facades.FieldType.ListBox, "Country", 1, 232.56f, 476.75f, 352.28f,
             514.03f);

         // Add list items to the 'Country' ListBox field
         formEditor.AddListItem("Country", "USA");
         formEditor.AddListItem("Country", "Canada");
         formEditor.AddListItem("Country", "France");
         formEditor.AddListItem("Country", "Spain");

         // Save PDF document
         formEditor.Save(dataDir + "Sample-Form-01-mod.pdf");
     }
 }

从现有 PDF 文件中删除列表项

DelListItem 方法允许您从 ListBox 中删除特定项目。第一个参数是字段名称，第二个参数是您想从列表中删除的项目。此方法由 FormEditor 类提供。以下代码片段演示了如何从 PDF 文件中删除列表项。

 // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
 private static void DelListItem()
 {
     // The path to the documents directory
     var dataDir = RunExamples.GetDataDir_AsposePdf();

     // Create an instance of FormEditor to manipulate form fields
     using (var formEditor = new Aspose.Pdf.Facades.FormEditor())
     {
         // Bind PDF document
         formEditor.BindPdf(dataDir + "Sample-Form-04.pdf");

         // Delete the list item "France" from the 'Country' ListBox field
         formEditor.DelListItem("Country", "France");

         // Save PDF document
         formEditor.Save(dataDir + "Sample-Form-04-mod.pdf");
     }
 }