C# asp.net开源插件推荐：PdfiumViewer ( pdf 转成 图片png pdf convert to image )

1. nuget 安装插件

2. 上代码

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// Define method to convert PDF to PNG         public void ConvertPdfToPng(string pdfFilePath, string pngFileFolder, ImageFormat format)         {             // Set resolution (DPI)             int dpi = 300;               // Render PDF to image             using (var document = PdfDocument.Load(pdfFilePath))             {                 for (int i = 0; i < document.PageCount; i++)                 {                     Thread.Sleep(100);                     using (var image = document.Render(i, dpi, dpi, PdfRenderFlags.CorrectFromDpi))                     {                         var encoder = ImageCodecInfo.GetImageEncoders().First(c => c.FormatID == format.Guid);                         var encParams = new EncoderParameters(1);                         encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 10L); //高质量                         image.Save(pngFileFolder + i + ".png", encoder, encParams);                       }                 }             }         }

3. 调用即可

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1	ConvertPdfToPng(inputPdfPath, outputImageFolder, ImageFormat.Png);