在 C# 和 VB.NET 中渲染并打印 PDF 文档

private void printDocument_PrintPage(object sender, PrintPageEventArgs e)
{
    Graphics gr = e.Graphics ?? throw new InvalidOperationException("No Graphics!");

    // 使用 point 单位，以便在所有上下文中保持一致的单位：
    // 1. 打印机
    // 2. 打印预览
    // 3. PDF
    gr.PageUnit = GraphicsUnit.Point;

    if (m_printAction == PrintAction.PrintToPreview)
    {
        gr.Clear(Color.LightGray);
        gr.FillRectangle(Brushes.White, m_printableAreaInPoints);
        gr.IntersectClip(m_printableAreaInPoints);

        gr.TranslateTransform(m_printableAreaInPoints.X, m_printableAreaInPoints.Y);
    }

    PdfPage page = m_pdf.Pages[m_pageIndex];
    PdfSize pageSizeInPoints = getPageSizeInPoints(page);

    if (m_printSize == PrintSize.FitPage)
    {
        float sx = (float)(m_printableAreaInPoints.Width / pageSizeInPoints.Width);
        float sy = (float)(m_printableAreaInPoints.Height / pageSizeInPoints.Height);
        float scaleFactor = Math.Min(sx, sy);

        centerContentInPrintableArea(gr, pageSizeInPoints, scaleFactor);
        gr.ScaleTransform(scaleFactor, scaleFactor);
    }
    else if (m_printSize == PrintSize.ActualSize)
    {
        centerContentInPrintableArea(gr, pageSizeInPoints, 1);
    }

    page.Draw(gr);

    ++m_pageIndex;
    e.HasMorePages = (m_pageIndex <= m_lastPageIndex);
}

using (var pdf = new PdfDocument("your_document.pdf"))
    action(pdf, getPrintSize());

public static DialogResult ShowPrintDialog(PdfDocument pdf, PrintSize printSize)
{
    using (var printDialog = new PrintDialog())
    {
        printDialog.AllowSomePages = true;
        printDialog.AllowCurrentPage = true;
        printDialog.AllowSelection = true;

        printDialog.PrinterSettings.MinimumPage = 1;
        printDialog.PrinterSettings.MaximumPage = pdf.PageCount;
        printDialog.PrinterSettings.FromPage = printDialog.PrinterSettings.MinimumPage;
        printDialog.PrinterSettings.ToPage = printDialog.PrinterSettings.MaximumPage;

        var result = printDialog.ShowDialog();
        if (result == DialogResult.OK)
        {
            using (var printDocument = new PdfPrintDocument(pdf, printSize))
                printDocument.Print(printDialog.PrinterSettings);
        }

        return result;
    }
}

using var pdf = new PdfDocument(@"your_document.pdf");

PdfDrawOptions options = PdfDrawOptions.Create();
options.HorizontalResolution = printerDpi;
options.VerticalResolution = printerDpi;

// 保存一页
pdf.Pages[0].Save("page0.png", options);

// 将整个文档保存为多页二值 TIFF
options.Compression = ImageCompressionOptions.CreateTiff().SetBitonal();
pdf.SaveAsTiff("your_document.tiff", options);

using var pdf = new PdfDocument("render.pdf");
const float TargetResolution = 300;

PdfPage page = pdf.Pages[0];
double scaleFactor = TargetResolution / page.Resolution;

using var bitmap = new Bitmap((int)(page.Width * scaleFactor), (int)(page.Height * scaleFactor));
bitmap.SetResolution(TargetResolution, TargetResolution);

using (Graphics gr = Graphics.FromImage(bitmap))
    page.Draw(gr);

bitmap.Save("result.png");