如何在C#中以程式化方式讀取PDF表單字段

using IronPdf;
PdfDocument pdf = PdfDocument.FromFile("complex_form.pdf");
// Text fields - standard input boxes
var nameField = pdf.Form.FindFormField("fullName");
string userName = nameField.Value;
// Checkboxes - binary selections
var agreeCheckbox = pdf.Form.FindFormField("termsAccepted.");
bool isChecked = agreeCheckbox.Value == "Yes";
// Radio buttons - single choice from group
var genderRadio = pdf.Form.FindFormField("gender");
string selectedGender = genderRadio.Value;
// Dropdown lists (ComboBox) - predefined options
var countryDropdown = pdf.Form.FindFormField("country");
string selectedCountry = countryDropdown.Value;
// Access all available options
var availableCountries = countryDropdown.Choices;
// Multi-line text areas
var commentsField = pdf.Form.FindFormField("comments_part1_513");
string userComments = commentsField.Value;
// Grab all fields that start with "interests_"
var interestFields = pdf.Form
    .Where(f => f.Name.StartsWith("interests_"));
// Collect checked interests
List<string> selectedInterests = new List<string>();
foreach (var field in interestFields)
{
    if (field.Value == "Yes")  // checkboxes are "Yes" if checked
    {
        // Extract the interest name from the field name
        string interestName = field.Name.Replace("interests_", "");
        selectedInterests.Add(interestName);
    }
}

Imports IronPdf

Dim pdf As PdfDocument = PdfDocument.FromFile("complex_form.pdf")

' Text fields - standard input boxes
Dim nameField = pdf.Form.FindFormField("fullName")
Dim userName As String = nameField.Value

' Checkboxes - binary selections
Dim agreeCheckbox = pdf.Form.FindFormField("termsAccepted.")
Dim isChecked As Boolean = agreeCheckbox.Value = "Yes"

' Radio buttons - single choice from group
Dim genderRadio = pdf.Form.FindFormField("gender")
Dim selectedGender As String = genderRadio.Value

' Dropdown lists (ComboBox) - predefined options
Dim countryDropdown = pdf.Form.FindFormField("country")
Dim selectedCountry As String = countryDropdown.Value

' Access all available options
Dim availableCountries = countryDropdown.Choices

' Multi-line text areas
Dim commentsField = pdf.Form.FindFormField("comments_part1_513")
Dim userComments As String = commentsField.Value

' Grab all fields that start with "interests_"
Dim interestFields = pdf.Form.Where(Function(f) f.Name.StartsWith("interests_"))

' Collect checked interests
Dim selectedInterests As New List(Of String)()
For Each field In interestFields
    If field.Value = "Yes" Then ' checkboxes are "Yes" if checked
        ' Extract the interest name from the field name
        Dim interestName As String = field.Name.Replace("interests_", "")
        selectedInterests.Add(interestName)
    End If
Next

using IronPdf;
using System;
using System.Text;
using System.IO;
using System.Collections.Generic;
public class SurveyProcessor
{
    static void Main(string[] args)
    {
        ProcessSurveyBatch(@"C:\Surveys");
    }
    public static void ProcessSurveyBatch(string folderPath)
    {
        StringBuilder csvData = new StringBuilder();
        csvData.AppendLine("Date,Name,Email,Rating,Feedback");
        foreach (string pdfFile in Directory.GetFiles(folderPath, "*.pdf"))
        {
            try
            {
                PdfDocument survey = PdfDocument.FromFile(pdfFile);
                string date = survey.Form.FindFormField("surveyDate")?.Value ?? "";
                string name = survey.Form.FindFormField("customerName")?.Value ?? "";
                string email = survey.Form.FindFormField("email")?.Value ?? "";
                string rating = survey.Form.FindFormField("satisfaction")?.Value ?? "";
                string feedback = survey.Form.FindFormField("comments")?.Value ?? "";
                feedback = feedback.Replace("\n", " ").Replace("\"", "\"\"");
                csvData.AppendLine($"{date},{name},{email},{rating},\"{feedback}\"");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error processing {pdfFile}: {ex.Message}");
            }
        }
        File.WriteAllText("survey_results.csv", csvData.ToString());
        Console.WriteLine("Survey processing complete!");
    }
}

Imports IronPdf
Imports System
Imports System.Text
Imports System.IO
Imports System.Collections.Generic

Public Class SurveyProcessor
    Shared Sub Main(args As String())
        ProcessSurveyBatch("C:\Surveys")
    End Sub

    Public Shared Sub ProcessSurveyBatch(folderPath As String)
        Dim csvData As New StringBuilder()
        csvData.AppendLine("Date,Name,Email,Rating,Feedback")

        For Each pdfFile As String In Directory.GetFiles(folderPath, "*.pdf")
            Try
                Dim survey As PdfDocument = PdfDocument.FromFile(pdfFile)
                Dim [date] As String = If(survey.Form.FindFormField("surveyDate")?.Value, "")
                Dim name As String = If(survey.Form.FindFormField("customerName")?.Value, "")
                Dim email As String = If(survey.Form.FindFormField("email")?.Value, "")
                Dim rating As String = If(survey.Form.FindFormField("satisfaction")?.Value, "")
                Dim feedback As String = If(survey.Form.FindFormField("comments")?.Value, "")
                feedback = feedback.Replace(vbLf, " ").Replace("""", """""")
                csvData.AppendLine($"{[date]},{name},{email},{rating},""{feedback}""")
            Catch ex As Exception
                Console.WriteLine($"Error processing {pdfFile}: {ex.Message}")
            End Try
        Next

        File.WriteAllText("survey_results.csv", csvData.ToString())
        Console.WriteLine("Survey processing complete!")
    End Sub
End Class