C# I'；m使用PdfSharp和can'；我找不到这个班，它在哪里？

我从这个链接中获取样本： 这里有一个示例：以原始大小绘制图像

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.IO;
using System.Drawing;
using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;

namespace Lightnings_Extractor
{
    class PDF
    {
        public PDF()
        {
            // Create a new PDF document
            PdfDocument document = new PdfDocument();
            document.Info.Title = "Created with PDFsharp";

            // Create an empty page
            PdfPage page = document.AddPage(); 
            // Get an XGraphics object for drawing
            XGraphics gfx = XGraphics.FromPdfPage(page); 
            // Create a font
            XFont font = new XFont("Verdana", 20, XFontStyle.BoldItalic); 
            // Draw the text
            gfx.DrawString("Hello, World!", font, XBrushes.Black,
            new XRect(0, 0, page.Width, page.Height),
            XStringFormats.Center); 
            // Save the document...
            const string filename = @"d:\HelloWorld.pdf";
            document.Save(filename);
            // ...and start a viewer.
            Process.Start(filename);
        }

        private void DrawImage(XGraphics gfx, int number)
        {
        }
    }
}

---

这里缺少什么？

BeginBox

和

EndBox

是在

请注意，这些方法仅用于创建周围的长方体，可能不是实现真正想要的功能（在本例中，以原始大小绘制图像）所需的方法。因此，我将从代码中删除这两行

void DrawImage(XGraphics gfx, int number)
{
  BeginBox(gfx, number, "DrawImage (original)");

  XImage image = XImage.FromFile(jpegSamplePath);

  // Left position in point
  double x = (250 - image.PixelWidth * 72 / image.HorizontalResolution) / 2;
  gfx.DrawImage(image, x, 0);

  EndBox(gfx);
}

public void BeginBox(XGraphics gfx, int number, string title)
{
  const int dEllipse = 15;
  XRect rect = new XRect(0, 20, 300, 200);
  if (number % 2 == 0)
    rect.X = 300 - 5;
  rect.Y = 40 + ((number - 1) / 2) * (200 - 5);
  rect.Inflate(-10, -10);
  XRect rect2 = rect;
  rect2.Offset(this.borderWidth, this.borderWidth);
  gfx.DrawRoundedRectangle(new XSolidBrush(this.shadowColor), rect2, new XSize(dEllipse + 8, dEllipse + 8));
  XLinearGradientBrush brush = new XLinearGradientBrush(rect, this.backColor, this.backColor2, XLinearGradientMode.Vertical);
  gfx.DrawRoundedRectangle(this.borderPen, brush, rect, new XSize(dEllipse, dEllipse));
  rect.Inflate(-5, -5);

  XFont font = new XFont("Verdana", 12, XFontStyle.Regular);
  gfx.DrawString(title, font, XBrushes.Navy, rect, XStringFormats.TopCenter);

  rect.Inflate(-10, -5);
  rect.Y += 20;
  rect.Height -= 20;

  this.state = gfx.Save();
  gfx.TranslateTransform(rect.X, rect.Y);
}

public void EndBox(XGraphics gfx)
{
  gfx.Restore(this.state);
}