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        /// <summary>
        /// 生成pdf
        /// </summary>
        /// <param name="htmlStr">生成內容</param>
        /// <param name="path">生成地址</param>
        private static void ConvertHtmlTextToPdf(string htmlStr, string filepath)
        {
            if (!Directory.Exists(filepath))  //不存在文件夾，創建
                Directory.createDirectory(filepath);  //創建新的文件夾
            var fileName = DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".pdf";
            var path = filepath + fileName;
            var document = new HtmlToPdfDocument
            {
                GlobalSettings =
                {
                    ProduceOutline = true,
                    DocumentTitle = "標題",
                    PaperSize = PaperKind.A4, // Implicit conversion to PechkinPaperSize
                    Margins =
                    {
                        All=0,
                        Unit = Unit.Centimeters
                    }
                },
                Objects =
                {
                    new ObjectSettings
                    {
                        HtmlText =htmlStr,
                        WebSettings =new WebSettings
                        {
                            DefaultEncoding="UTF-8",
                            LoadImages=true,
                        }
                    }
                },
            };
            byte[] buf = GetConverter().Convert(document);
            //直接把result二進制數據寫入文件流
            FileStream fs = new FileStream(path, FileMode.OpenOrcreate);
            fs.Write(buf, 0, buf.Length);
            fs.Close();
            IToolset toolset = new PdfToolset();
            toolset.Unload();  
        }