.net core 项目中几款常用类库收藏

    public static class Pinyin
    {
        public static string ConvertEncoding(string text, Encoding srcEncoding, Encoding dstEncoding);
        public static string GetChineseText(string pinyin);
        public static string GetChineseText(string pinyin, Encoding encoding);
        public static string GetInitials(string text);
        public static string GetInitials(string text, Encoding encoding);
        public static string GetPinyin(string text);
        public static string GetPinyin(string text, Encoding encoding);
        public static string GetPinyin(char ch);
        public static string GetPinyin(char ch, Encoding encoding);
    }

           string sFileName = $"{Guid.NewGuid()}.xlsx";
            FileInfo file = new FileInfo(sFileName);
            string[] title = { "货品编号",
                "货品名称",
                "条码",
                "规格",
                "基本单位",
                "当前库存",
                "库存下限",
                "库存上限"
            };
            using (ExcelPackage package = new ExcelPackage(file))
            {
                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("库存信息");
                int index = 1;
                foreach (string t in title)
                {
                    worksheet.Cells[1, index++].Value = t;
                }
                index = 2;
                foreach (var d in list)
                {
                    worksheet.Cells[index,1].Value = d.ProductCode;
                    worksheet.Cells[index, 2].Value = d.ProductName;
                    worksheet.Cells[index, 3].Value = d.BarCode;
                    worksheet.Cells[index, 4].Value = d.SpecValues;
                    worksheet.Cells[index, 5].Value = d.BaseUnit;
                    worksheet.Cells[index, 6].Value = d.Quantity;
                    worksheet.Cells[index, 7].Value = d.DownLimitQuantity;
                    worksheet.Cells[index, 8].Value = d.UpLimitQuantity;
                    index++;
                }
                package.Save();

            }

           string tempFilePath = $"{Guid.NewGuid()}.pdf";
            string[] title = { "货品编号",
                "货品名称",
                "条码",
                "规格",
                "基本单位",
                "当前库存",
                "库存下限",
                "库存上限"
            };
            using (FileStream wfs = new FileStream(tempFilePath, FileMode.OpenOrCreate)) {
                //PageSize.A4.Rotate();当需要把PDF纸张设置为横向时
                Document docPDF = new Document(PageSize.A4,10, 10, 20,20);
                PdfWriter write = PdfWriter.GetInstance(docPDF, wfs);
                docPDF.Open();
                //在这里需要注意的是，itextsharp不支持中文字符，想要显示中文字符的话需要自己设置字体 
                BaseFont bsFont = BaseFont.CreateFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                Font font = new Font(bsFont);

                float[] clos = new float[] { 40,40,40,20,20,30,30,30};// 宽度
                PdfPTable tablerow1 = new PdfPTable(clos);
                foreach (string t in title)
                {
                    PdfPCell cell = new PdfPCell(new Paragraph(t, font));
                    cell.MinimumHeight = 4f;
                    tablerow1.AddCell(cell);
                }
                foreach (var d in list)
                {
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.ProductCode, font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.ProductName, font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.BarCode, font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.SpecValues, font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.BaseUnit, font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.Quantity.ToString(), font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.DownLimitQuantity.ToString(), font)));
                    tablerow1.AddCell(new PdfPCell(new Paragraph(d.UpLimitQuantity.ToString(), font)));
                }
                docPDF.Add(tablerow1);//将表格添加到pdf文档中

                docPDF.Close();//关闭
                write.Close();
                wfs.Close();
            }

var dom = htmlParser.Parse(html);
var result = dom.QuerySelectorAll("div.class").ToList();