如何使用MigraDoc + PDFsharp创建内部带有文本的正方形

// 导入必要的命名空间
using PdfSharp;
using PdfSharp.Drawing;
using MigraDoc.DocumentObjectModel;
using MigraDoc.DocumentObjectModel.Shapes;

// 创建新的PDF文档
Document document = new Document();

// 添加一个页面
Section section = document.AddSection();

// 创建一个正方形形状并设置位置、大小和背景颜色
Shape shape = section.AddShape();
shape.Left = "2cm";
shape.Top = "2cm";
shape.Width = "5cm";
shape.Height = "5cm";
shape.FillFormat.Color = Colors.LightGray;

// 在正方形中添加文本框
TextFrame textFrame = shape.AddTextFrame();
textFrame.MarginLeft = "0.5cm";
textFrame.MarginRight = "0.5cm";
textFrame.MarginTop = "0.5cm";
textFrame.MarginBottom = "0.5cm";

// 在文本框中添加文本
Paragraph paragraph = textFrame.AddParagraph();
paragraph.Format.Font.Size = 12;
paragraph.AddFormattedText("这是一个带有文本的正方形。");

// 保存PDF文档
string filePath = "path/to/save/document.pdf";
PdfDocumentRenderer renderer = new PdfDocumentRenderer();
renderer.Document = document;
renderer.RenderDocument();
renderer.PdfDocument.Save(filePath);