1、nuget  安裝 iTextSharp (V4.1.6) to .NET Core.

2、code

 public DataTable ToDataTable<T>(IEnumerable<T> collection, Dictionary<string, string> columnMaps = null)
        {
            var props = typeof(T).GetProperties();
            var dt = new DataTable();
            dt.Columns.AddRange(props.Select(p 
 
=> new DataColumn(p.Name, p.PropertyType)).ToArray());
            if (collection.Count() > 0)
            {
                for (int i = 0; i < collection.Count(); i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in
 
 props)
                    {
                        object obj = pi.GetValue(collection.ElementAt(i), null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    dt.LoadDataRow(array, true);
                }
            }

            
 
if (columnMaps != null)
            {
                //修改列名
                foreach (var item in columnMaps)
                {
                    dt.Columns[item.Key].ColumnName = item.Value;
                }
            }

            return dt;
        }

        public bool ConvertDataTableToPDF(DataTable Data, string PDFFile, float FontSize)
        {
            try
            {
                GenepointLog.Info($"開始匯出pdf--{PDFFile}");
                //定義頁面的大小
                Rectangle pageSize = PageSize.A4;
                Document document = new Document(pageSize);
                //預設頁面大小
                //Document document = new Document();
                var stream = new FileStream(PDFFile, FileMode.OpenOrCreate);
                PdfWriter writer = PdfWriter.GetInstance(document, stream);
                document.Open();
                //設定字型
                //BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1257, BaseFont.NOT_EMBEDDED);
                BaseFont.AddToResourceSearch("iTextAsian.dll");
                BaseFont.AddToResourceSearch("iTextAsianCmaps.dll");
                BaseFont bf = BaseFont.CreateFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                //BaseFont bf = BaseFont.CreateFont("STSong-Light,Italic", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                Font font = new Font(bf, FontSize);

                PdfPTable table = new PdfPTable(Data.Columns.Count);
                table.WidthPercentage = 100; // percentage
                table.DefaultCell.Padding = 1;
                table.DefaultCell.BorderWidth = 0.2f;
                table.DefaultCell.HorizontalAlignment = Element.ALIGN_LEFT;
                //將datatable表頭轉換成PDFTable的表頭
                foreach (DataColumn dc in Data.Columns)
                {
                    table.AddCell(new Phrase(dc.ColumnName.ToString(), font));
                }
                //插入資料
                for (int i = 0; i < Data.Rows.Count; i++)
                {
                    for (int j = 0; j < Data.Columns.Count; j++)
                    {
                        table.AddCell(new Phrase(Data.Rows[i][j].ToString(), font));
                    }
                }
                document.Add(table);
                document.Close();
                writer.Close();
                stream.Dispose();
                GenepointLog.Info("結束匯出pdf");
                return true;
            }
            catch (Exception ex)
            {
                GenepointLog.Error($"匯出pdf失敗{PDFFile}", ex);
                return false;
            }

        }