using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
using Spire.Pdf;
 
 
namespace KZT
{
    class Program
    {
        static void Main(string[] args)
        {
 
            Console.WriteLine("开始转换.....");
            PdfDocument doc = new PdfDocument();
            
            doc.LoadFromFile(@"C:\Users\qusu123\Desktop\convert\123.pdf");
            Console.WriteLine("转换期间比较漫长请耐心等待.....");
            doc.SaveToFile(@"C:\Users\qusu123\Desktop\convert\123.docx", FileFormat.DOC);
            Console.WriteLine("转换成功");
            System.Diagnostics.Process.Start(@"C:\Users\qusu123\Desktop\convert\123.docx");
 
        }
    }
}
原文:https://www.cnblogs.com/jimmyLei/p/9934217.html