新版的Aspose.Pdf for .NET v8.7.0包含了一個新功能——使開發人員能確保輸入到表單域中的只有數值。OnModifyCharacter和OnFormat屬性被添加到了Field.Actions。為了驗證用戶輸入，將使用AFNumber_Keystroke和AFNumber_Format Java script函數。請看下面的代碼片段。

// Load input PDF file
Document doc = new Document("c:/pdftest/ABFillablewfields.pdf");
TextBoxField field = (TextBoxField)doc.Form["husband name"];
// //www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FormsAPIReference.pdf
// 2 digits after point
// No separator
// Neg style = minus
// No currency
field.Actions.OnModifyCharacter = new JavascriptAction("AFNumber_Keystroke(2, 1, 1, 0, \"\", true)");
field.Actions.OnFormat = new JavascriptAction("AFNumber_Format(2, 1, 1, 0, \"\", true)");
// Set initial field value
field.Value = "123";
// Save resultant PDF
doc.Save("c:/pdftest/Restricted_out.pdf");

確定字段屬性

PDF表單創建時，一些字段被標記為強制性的，我們可能需要確定一個特定字段是否被標記為強制性。請使用如下代碼片段來找出一個字段是否被標記為必須的。

// Load source PDF file
Document pdf = new Document(@"c:\pdftest\RequiredField_output.pdf");
// Instantiate Form object
Aspose.Pdf.Facades.Form pdfForm = new Aspose.Pdf.Facades.Form(pdf);
// Iterate through each field inside PDF form
foreach (Field field in pdf.Form.Fields)
{
    // Determine if the field is marked as required or not
    bool isRequired = pdfForm.IsRequiredField(field.FullName);
    if (isRequired)
    {
        // Print either the field is marked as required or not
        Console.WriteLine("The field named " + field.FullName + " is required");
    }
}

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