使用C#读取PDF元数据的操作指南

using Spire.Pdf;

using System;
using Spire.Pdf;

namespace PdfMetadataReader
{
    class Program
    {
        static void Main(string[] args)
        {
            string pdfFilePath = "Sample.pdf";

            try
            {
                using (PdfDocument doc = new PdfDocument())
                {
                    // 加载 PDF 文件
                    doc.LoadFromFile(pdfFilePath);

                    Console.WriteLine("=== PDF 标准文档属性 ===");
                    Console.WriteLine($"标题 (Title): {doc.DocumentInformation.Title}");
                    Console.WriteLine($"作者 (Author): {doc.DocumentInformation.Author}");
                    Console.WriteLine($"主题 (Subject): {doc.DocumentInformation.Subject}");
                    Console.WriteLine($"关键词 (Keywords): {doc.DocumentInformation.Keywords}");
                    Console.WriteLine($"创建时间 (CreationDate): {doc.DocumentInformation.CreationDate}");
                    Console.WriteLine($"修改时间 (ModificationDate): {doc.DocumentInformation.ModificationDate}");
                    Console.WriteLine($"创建程序 (Creator): {doc.DocumentInformation.Creator}");
                    Console.WriteLine($"生成器 (Producer): {doc.DocumentInformation.Producer}");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("读取 PDF 元数据失败：" + ex.Message);
            }

            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using Spire.Pdf;

namespace PdfMetadataReader
{
    class Program
    {
        static void Main(string[] args)
        {
            string pdfFilePath = "SampleWithCustomMetadata.pdf";

            try
            {
                using (PdfDocument doc = new PdfDocument())
                {
                    doc.LoadFromFile(pdfFilePath);

                    Console.WriteLine("=== PDF 自定义文档属性 ===");

                    var customProperties = doc.DocumentInformation.GetAllCustomProperties();

                    if (customProperties != null && customProperties.Count > 0)
                    {
                        foreach (KeyValuePair<string, string> item in customProperties)
                        {
                            Console.WriteLine($"{item.Key} : {item.Value}");
                        }
                    }
                    else
                    {
                        Console.WriteLine("当前 PDF 未包含自定义元数据。");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("读取 PDF 自定义元数据失败：" + ex.Message);
            }

            Console.ReadKey();
        }
    }
}