.NET Core Exact Dimension PDF Printer

"C# .NET Core PDF Printing Service (Exact Size, No Scaling) for Windows"

Project Description

Develop a C# .NET Core class/service that prints PDFs at their exact dimensions (no scaling/distortion) on any Windows-supported printer. The solution must:

Accept a PDF file path and printer name.

Auto-detect the PDF’s page size (in millimeters).

Configure the printer temporarily to match the PDF’s dimensions.

Handle printer limitations (margins, unsupported sizes).

Requirements
Deliverables:

A C# class/service (e.g., PdfPrintService.cs) with a method:

public bool PrintPdf(string pdfPath, string printerName);
Optional helper class to detect PDF dimensions (e.g., PdfSizeReader.cs).

Test PDFs will be provided for testing with non-standard sizes (e.g., 132x96 mm, 340x110 mm).

Technical Constraints:

Target .NET Core 7/8 (cross-platform, but Windows-only for printing).

No third-party PDF libraries (unless open-source and MIT license).

Key Features:

Precision: Match PDF dimensions exactly (1:1).

Centering: Content centered if hardware margins allow.

Error Handling: Clear exceptions for unsupported sizes.

Skills Required
Expertise in C# .NET Core and Windows printing APIs.

Experience with PDF metadata extraction (e.g., page size in mm).

Knowledge of printer configuration (custom paper sizes).

Example Code Structure

using System.Drawing.Printing;
using PdfSharp.Pdf; // Example with PDFSharp (open-source)

public class PdfPrintService
{
public bool PrintPdf(string pdfPath, string printerName)
{
// 1. Get PDF dimensions
var (widthMm, heightMm) = GetPdfSize(pdfPath);

// 2. Configure printer
var settings = new PrinterSettings
{
PrinterName = printerName,
DefaultPageSettings = new PageSettings
{
PaperSize = CreateCustomPaperSize(widthMm, heightMm),
Margins = new Margins(0, 0, 0, 0) // Minimize margins
}
};

// 3. Print
using var document = new PdfDocument(pdfPath);
// ... (implement printing logic)
return true;
}

private PaperSize CreateCustomPaperSize(float widthMm, float heightMm)
{
// Convert mm to hundredths of inches (1 inch = 25.4 mm)
int widthHundredthsInch = (int)(widthMm / 25.4 * 100);
int heightHundredthsInch = (int)(heightMm / 25.4 * 100);

return new PaperSize("Custom", widthHundredthsInch, heightHundredthsInch);
}
}
Testing Criteria
Test 1 – Exact Dimensions:

Print a 132x96 mm PDF and measure the output with calipers.

Test 2 – Printer Agnostic:

Verify compatibility with 2+ printers (e.g., HP LaserJet, Brother).

Budget & Timeline
Budget: Fixed price (specify in proposal).

Deadline: 7 days after acceptance.

Submission Guidelines
Proposal Must Include:

Approach to extract PDF dimensions (library or custom code).

Strategy to handle printer margins.

Example of printing logic (pseudo-code or snippet).

Exclude: Proposals relying on paid libraries (e.g., Adobe Acrobat SDK).