如何在 ASP.NET Framework Web App 中列印 PDF（C#）

@{
    ViewBag.Title = "Home Page";
}

<main>
    <section class="row" aria-labelledby="aspnetTitle">
        <h1 id="title">ASP.NET</h1>
        <p>

            <a class="btn btn-primary btn-md" onclick="location.href='@Url.Action("PrintPdf", "Home")'">Print PDF</a>
        </p>
    </section>
</main>

using IronPrint;
using System.Threading.Tasks;
using System.Web.Mvc;

namespace WebApplication4.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";
            return View();
        }

        public ActionResult Contact()
        {
            return View();
        }

        // Action method to handle the printing operation
        // This makes use of the PrintAsync method to avoid blocking the main thread
        public ActionResult PrintPdf()
        {
            // Wait for the asynchronous print operation to complete
            Printer.PrintAsync("Basic.pdf").Wait();

            // Return some view, for example, a confirmation page or the index page
            return View(); // Replace with an appropriate view
        }
    }
}

Imports IronPrint
Imports System.Threading.Tasks
Imports System.Web.Mvc

Namespace WebApplication4.Controllers
	Public Class HomeController
		Inherits Controller

		Public Function Index() As ActionResult
			Return View()
		End Function

		Public Function About() As ActionResult
			ViewBag.Message = "Your application description page."
			Return View()
		End Function

		Public Function Contact() As ActionResult
			Return View()
		End Function

		' Action method to handle the printing operation
		' This makes use of the PrintAsync method to avoid blocking the main thread
		Public Function PrintPdf() As ActionResult
			' Wait for the asynchronous print operation to complete
			Printer.PrintAsync("Basic.pdf").Wait()

			' Return some view, for example, a confirmation page or the index page
			Return View() ' Replace with an appropriate view
		End Function
	End Class
End Namespace

using IronPrint;
using System;
using System.Threading.Tasks;
using System.Web.Mvc;

namespace WebApplication4.Controllers
{
    public class HomeController : Controller
    {
        // Async action method with proper error handling
        public async Task<ActionResult> PrintPdfAdvanced()
        {
            try
            {
                // Create custom print settings
                var printSettings = new PrintSettings
                {
                    // Select specific printer
                    PrinterName = "Microsoft Print to PDF",
                    // Set paper size
                    PaperSize = PaperSize.A4,
                    // Configure orientation
                    PaperOrientation = PaperOrientation.Portrait,
                    // Set number of copies
                    NumberOfCopies = 1,
                    // Configure DPI for high-quality output
                    Dpi = 300
                };

                // Print asynchronously with custom settings
                await Printer.PrintAsync("Basic.pdf", printSettings);

                // Log successful print operation (optional)
                System.Diagnostics.Debug.WriteLine("Document printed successfully");

                // Return success view or redirect
                TempData["PrintMessage"] = "Document sent to printer successfully!";
                return RedirectToAction("Index");
            }
            catch (Exception ex)
            {
                // Handle printing errors gracefully
                System.Diagnostics.Debug.WriteLine($"Printing error: {ex.Message}");
                TempData["ErrorMessage"] = "Unable to print document. Please try again.";
                return RedirectToAction("Index");
            }
        }
    }
}

Imports IronPrint
Imports System
Imports System.Threading.Tasks
Imports System.Web.Mvc

Namespace WebApplication4.Controllers
    Public Class HomeController
        Inherits Controller

        ' Async action method with proper error handling
        Public Async Function PrintPdfAdvanced() As Task(Of ActionResult)
            Try
                ' Create custom print settings
                Dim printSettings As New PrintSettings With {
                    ' Select specific printer
                    .PrinterName = "Microsoft Print to PDF",
                    ' Set paper size
                    .PaperSize = PaperSize.A4,
                    ' Configure orientation
                    .PaperOrientation = PaperOrientation.Portrait,
                    ' Set number of copies
                    .NumberOfCopies = 1,
                    ' Configure DPI for high-quality output
                    .Dpi = 300
                }

                ' Print asynchronously with custom settings
                Await Printer.PrintAsync("Basic.pdf", printSettings)

                ' Log successful print operation (optional)
                System.Diagnostics.Debug.WriteLine("Document printed successfully")

                ' Return success view or redirect
                TempData("PrintMessage") = "Document sent to printer successfully!"
                Return RedirectToAction("Index")
            Catch ex As Exception
                ' Handle printing errors gracefully
                System.Diagnostics.Debug.WriteLine($"Printing error: {ex.Message}")
                TempData("ErrorMessage") = "Unable to print document. Please try again."
                Return RedirectToAction("Index")
            End Try
        End Function
    End Class
End Namespace

// Get list of available printers
public ActionResult GetAvailablePrinters()
{
    var printers = Printer.GetPrinterNames();
    ViewBag.PrinterList = new SelectList(printers);
    return View();
}

' Get list of available printers
Public Function GetAvailablePrinters() As ActionResult
    Dim printers = Printer.GetPrinterNames()
    ViewBag.PrinterList = New SelectList(printers)
    Return View()
End Function