[c#] How can I send a file document to the printer and have it print?

Here's the basic premise:

My user clicks some gizmos and a PDF file is spit out to his desktop. Is there some way for me to send this file to the printer queue and have it print to the locally connected printer?

string filePath = "filepathisalreadysethere";
SendToPrinter(filePath); //Something like this?

He will do this process many times. For each student in a classroom he has to print a small report card. So I generate a PDF for each student, and I'd like to automate the printing process instead of having the user generated pdf, print, generate pdf, print, generate pdf, print.

Any suggestions on how to approach this? I'm running on Windows XP with Windows Forms .NET 4.

I've found this StackOverflow question where the accepted answer suggests:

Once you have created your files, you can print them via a command line (you can using the Command class found in the System.Diagnostics namespace for that)

How would I accomplish this?

You can use the DevExpress PdfDocumentProcessor.Print(PdfPrinterSettings) Method.

public void Print(string pdfFilePath)
{
      if (!File.Exists(pdfFilePath))
          throw new FileNotFoundException("No such file exists!", pdfFilePath);

      // Create a Pdf Document Processor instance and load a PDF into it.
      PdfDocumentProcessor documentProcessor = new PdfDocumentProcessor();
      documentProcessor.LoadDocument(pdfFilePath);

      if (documentProcessor != null)
      {
          PrinterSettings settings = new PrinterSettings();

          //var paperSizes = settings.PaperSizes.Cast<PaperSize>().ToList();
          //PaperSize sizeCustom = paperSizes.FirstOrDefault<PaperSize>(size => size.Kind == PaperKind.Custom); // finding paper size

          settings.DefaultPageSettings.PaperSize = new PaperSize("Label", 400, 600);

          // Print pdf
          documentProcessor.Print(settings);
      }
}

I know the tag says Windows Forms... but, if anyone is interested in a WPF application method, System.Printing works like a charm.

var file = File.ReadAllBytes(pdfFilePath);
var printQueue = LocalPrintServer.GetDefaultPrintQueue();

using (var job = printQueue.AddJob())
using (var stream = job.JobStream)
{
    stream.Write(file, 0, file.Length);
}

Just remember to include System.Printing reference, if it's not already included. Now, this method does not play well with ASP.NET or Windows Service. It should not be used with Windows Forms, as it has System.Drawing.Printing. I don't have a single issue with my PDF printing using the above code.

I should mention, however, that if your printer does not support Direct Print for PDF file format, you're out of luck with this method.

I know Edwin answered it above but his only prints one document. I use this code to print all files from a given directory.

public void PrintAllFiles()
{
    System.Diagnostics.ProcessStartInfo info = new System.Diagnostics.ProcessStartInfo();
    info.Verb = "print";
    System.Diagnostics.Process p = new System.Diagnostics.Process();
    //Load Files in Selected Folder
    string[] allFiles = System.IO.Directory.GetFiles(Directory);
    foreach (string file in allFiles)
    {
        info.FileName = @file;
        info.CreateNoWindow = true;
        info.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
         p.StartInfo = info;
        p.Start();
    }
    //p.Kill(); Can Create A Kill Statement Here... but I found I don't need one
    MessageBox.Show("Print Complete");
}

It essentually cycles through each file in the given directory variable Directory - > for me it was @"C:\Users\Owner\Documents\SalesVaultTesting\" and prints off those files to your default printer.

This is a slightly modified solution. The Process will be killed when it was idle for at least 1 second. Maybe you should add a timeof of X seconds and call the function from a separate thread.

private void SendToPrinter()
{
  ProcessStartInfo info = new ProcessStartInfo();
  info.Verb = "print";
  info.FileName = @"c:\output.pdf";
  info.CreateNoWindow = true;
  info.WindowStyle = ProcessWindowStyle.Hidden;

  Process p = new Process();
  p.StartInfo = info;
  p.Start();

  long ticks = -1;
  while (ticks != p.TotalProcessorTime.Ticks)
  {
    ticks = p.TotalProcessorTime.Ticks;
    Thread.Sleep(1000);
  }

  if (false == p.CloseMainWindow())
    p.Kill();
}

Adding a new answer to this as the question of printing PDF's in .net has been around for a long time and most of the answers pre-date the Google Pdfium library, which now has a .net wrapper. For me I was researching this problem myself and kept coming up blank, trying to do hacky solutions like spawning Acrobat or other PDF readers, or running into commercial libraries that are expensive and have not very compatible licensing terms. But the Google Pdfium library and the PdfiumViewer .net wrapper are Open Source so are a great solution for a lot of developers, myself included. PdfiumViewer is licensed under the Apache 2.0 license.

You can get the NuGet package here:

https://www.nuget.org/packages/PdfiumViewer/

and you can find the source code here:

https://github.com/pvginkel/PdfiumViewer

Here is some simple code that will silently print any number of copies of a PDF file from it's filename. You can load PDF's from a stream also (which is how we normally do it), and you can easily figure that out looking at the code or examples. There is also a WinForm PDF file view so you can also render the PDF files into a view or do print preview on them. For us I simply needed a way to silently print the PDF file to a specific printer on demand.

public bool PrintPDF(
    string printer,
    string paperName,
    string filename,
    int copies)
{
    try {
        // Create the printer settings for our printer
        var printerSettings = new PrinterSettings {
            PrinterName = printer,
            Copies = (short)copies,
        };

        // Create our page settings for the paper size selected
        var pageSettings = new PageSettings(printerSettings) {
            Margins = new Margins(0, 0, 0, 0),
        };
        foreach (PaperSize paperSize in printerSettings.PaperSizes) {
            if (paperSize.PaperName == paperName) {
                pageSettings.PaperSize = paperSize;
                break;
            }
        }

        // Now print the PDF document
        using (var document = PdfDocument.Load(filename)) {
            using (var printDocument = document.CreatePrintDocument()) {
                printDocument.PrinterSettings = printerSettings;
                printDocument.DefaultPageSettings = pageSettings;
                printDocument.PrintController = new StandardPrintController();
                printDocument.Print();
            }
        }
        return true;
    } catch {
        return false;
    }
}

this is a late answer, but you could also use the File.Copy method of the System.IO namespace top send a file to the printer:

System.IO.File.Copy(filename, printerName);

This works fine

The easy way:

var pi=new ProcessStartInfo("C:\file.docx");
pi.UseShellExecute = true;
pi.Verb = "print";
var process =  System.Diagnostics.Process.Start(pi);

The following code snippet is an adaptation of Kendall Bennett's code for printing pdf files using the PdfiumViewer library. The main difference is that a Stream is used rather than a file.

public bool PrintPDF(
    string printer,
    string paperName,
    int copies, Stream stream)
        {
            try
            {
                // Create the printer settings for our printer
                var printerSettings = new PrinterSettings
                {
                    PrinterName = printer,
                    Copies = (short)copies,
                };

            // Create our page settings for the paper size selected
            var pageSettings = new PageSettings(printerSettings)
            {
                Margins = new Margins(0, 0, 0, 0),
            };
            foreach (PaperSize paperSize in printerSettings.PaperSizes)
            {
                if (paperSize.PaperName == paperName)
                {
                    pageSettings.PaperSize = paperSize;
                    break;
                }
            }

            // Now print the PDF document
            using (var document = PdfiumViewer.PdfDocument.Load(stream))
            {
                using (var printDocument = document.CreatePrintDocument())
                {
                    printDocument.PrinterSettings = printerSettings;
                    printDocument.DefaultPageSettings = pageSettings;
                    printDocument.PrintController = new StandardPrintController();
                    printDocument.Print();
                }
            }
            return true;
        }
        catch (System.Exception e)
        {
            return false;
        }
    }

In my case I am generating the PDF file using a library called PdfSharp and then saving the document to a Stream like so:

        PdfDocument pdf = PdfGenerator.GeneratePdf(printRequest.html, PageSize.A4);
        pdf.AddPage();

        MemoryStream stream = new MemoryStream();
        pdf.Save(stream);
        MemoryStream stream2 = new MemoryStream(stream.ToArray());

One thing that I want to point out that might be helpful to other developers is that I had to install the 32 bit version of the pdfuim native dll in order for the printing to work even though I am running Windows 10 64 bit. I installed the following two NuGet packages using the NuGet package manager in Visual Studio:

• PdfiumViewer
• PdfiumViewer.Native.x86.v8-xfa

    public static void PrintFileToDefaultPrinter(string FilePath)
    {
        try
        {
            var file = File.ReadAllBytes(FilePath);
            var printQueue = LocalPrintServer.GetDefaultPrintQueue();

            using (var job = printQueue.AddJob())
            using (var stream = job.JobStream)
            {
                stream.Write(file, 0, file.Length);
            }
        }
        catch (Exception)
        {

            throw;
        }
    }

System.Diagnostics.Process.Start can be used to print a document. Set UseShellExecute to True and set the Verb to "print".

You can try with GhostScript like in this post:

How to print PDF on default network printer using GhostScript (gswin32c.exe) shell command