想实现的功能是pdf+签名图片合并起来，后面看到了免费开源的PdfSharpCore.
先安装
public static class PdfSharpCoreHelper{private static string GetOutFilePath(string name){string OutputDirName = @".";return System.IO.Path.Combine(OutputDirName, name);}/// <summary>/// 保存文件/// </summary>/// <param name="document">PdfDocument</param>/// <param name="name">文件名</param>private static void SaveDocument(PdfSharpCore.Pdf.PdfDocument document, string name){string outFilePath = GetOutFilePath(name);string? dir = System.IO.Path.GetDirectoryName(outFilePath);if (dir != null && !System.IO.Directory.Exists(dir)){System.IO.Directory.CreateDirectory(dir);}document.Save(outFilePath);}/// <summary>/// 将图片 文字添加到PDF文档中/// </summary>public static void ConvertSVGtoPDF(){System.Console.WriteLine("Starting...");//获取pdf文件PdfDocument document = PdfReader.Open(@"F:\svn项目\ConvertSVGtoPDF.pdf", PdfDocumentOpenMode.Modify);//获取第一页pdfPdfSharpCore.Pdf.PdfPage? pageNewRenderer = document.Pages[0];PdfSharpCore.Drawing.XGraphics? renderer = PdfSharpCore.Drawing.XGraphics.FromPdfPage(pageNewRenderer);//添加图片renderer.DrawImage(XImage.FromFile(@"F:\svn项目\svgdq.jpg"),new PdfSharpCore.Drawing.XPoint(120, 120));//添加文字renderer.DrawString("Testy Test Test", new PdfSharpCore.Drawing.XFont("Arial", 12), PdfSharpCore.Drawing.XBrushes.Black, new PdfSharpCore.Drawing.XPoint(12, 12));//保存SaveDocument(document, "dsada.pdf");}}
