using Spire.Pdf;
 
namespace PrintWithDefaultPrinter
{
    class Program
    {
        static void Main(string[] args)
        {
            // 創(chuàng)建一個 PdfDocument 對象
            PdfDocument pdf = new PdfDocument();
 
            // 加載一個 PDF 文件
            pdf.LoadFromFile("示例文檔.pdf");
 
            // 打印到默認(rèn)打印機(jī)
            pdf.Print();
 
            // 清理資源
            pdf.Dispose();
 
        }
    }
}

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing.Printing;
using System.IO;
using System.Runtime.InteropServices;

namespace PDF
{
    public static class PrintHelper
    {
        #region 打印機(jī)操作核心方法

        /// <summary>
        /// // 設(shè)置默認(rèn)打印機(jī)
        /// </summary>
        /// <param name="Name"></param>
        /// <returns></returns>
        [DllImport("winspool.drv")]
        public static extern bool SetDefaultPrinter(String Name);

        /// <summary>
        /// 獲取系統(tǒng)默認(rèn)打印機(jī)名稱
        /// </summary>
        public static string DefaultPrinterName()
        {
            PrintDocument fPrintDocument = new PrintDocument();
            return fPrintDocument.PrinterSettings.PrinterName;
        }

        /// <summary>
        /// 獲取本機(jī)所有打印機(jī)列表
        /// </summary>
        public static List<string> GetLocalPrinters()
        {
            List<string> fPrinters = new List<string>();
            fPrinters.Add(DefaultPrinterName());

            foreach (string fPrinterName in PrinterSettings.InstalledPrinters)
            {
                if (!fPrinters.Contains(fPrinterName))
                {
                    fPrinters.Add(fPrinterName);
                }
            }
            return fPrinters;
        }

        /// <summary>
        /// 設(shè)置指定打印機(jī)為默認(rèn)打印機(jī)
        /// </summary>
        public static bool SetLocalPrinter(string defaultPrinter)
        {
            foreach (string item in GetLocalPrinters())
            {
                if (item.Contains(defaultPrinter))
                {
                    return SetDefaultPrinter(item);
                }
            }
            return false;
        }

        #endregion

        /// <summary>
        /// 打印
        /// 通過系統(tǒng)關(guān)聯(lián)程序打印文件
        /// 需注意的是，這種方式依賴于文件類型的默認(rèn)關(guān)聯(lián)程序
        /// </summary>
        public static void PrintByDefaultProcess(string LocalPath)
        {
            Process p = new Process();
            ProcessStartInfo startInfo = new ProcessStartInfo
            {
                CreateNoWindow = true,
                WindowStyle = ProcessWindowStyle.Hidden,
                UseShellExecute = true,
                FileName = LocalPath,
                Verb = "print",  // 它會調(diào)用與文件類型關(guān)聯(lián)的默認(rèn)應(yīng)用程序來執(zhí)行打印文件，如Adobe Reader或者word或圖片查看器或其他PDF閱讀器進(jìn)行打印
                Arguments = $"/p /h \"{LocalPath}\" \"{DefaultPrinterName()}\"",
                //WorkingDirectory = Path.GetDirectoryName(Application.ExecutablePath)   // 設(shè)置工作目錄為應(yīng)用程序啟動目錄
            };
            p.StartInfo = startInfo;
            p.Start();
            p.WaitForExit(5); // 等待5秒鐘，確保打印任務(wù)已提交
        }
    }
}

public static void PrintWithAdobeCommandLine(string filePath, string printerName)
{
    string adobePath = @"C:\Program Files\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe";
    Process.Start(adobePath, $"/t \"{filePath}\" \"{printerName}\"");
}

using Adobe.Acrobat;

public static void PrintWithAdobePdf(string filePath)
{
    Acrobat.AcroApp app = new Acrobat.AcroApp();
    Acrobat.AcroAVDoc avDoc = new Acrobat.AcroAVDoc();

    if (avDoc.Open(filePath, ""))
    {
        Acrobat.AcroPDDoc pdDoc = (Acrobat.AcroPDDoc)avDoc.GetPDDoc();
        pdDoc.PrintPages(0, 0, 0, 0, 0, 0, 0); // 參數(shù)需根據(jù)需求調(diào)整
        avDoc.Close(true);
    }
    app.Exit();
}

public static void PrintPdfAsImage(string filePath)
{
    using (var document = PdfDocument.Load(filePath)) // 需要 PdfiumViewer 或其他庫
    {
        var printDoc = new System.Drawing.Printing.PrintDocument();
        printDoc.PrintPage += (sender, e) =>
        {
            e.Graphics.DrawImage(document.RenderToImage(), e.MarginBounds);
            e.HasMorePages = false;
        };
        printDoc.Print();
    }
}