NPOI读取Excel，导入数据到Excel练习01

NPOI 2.2.0.0,初级读取导入Excel

1.读取Excel，将数据绑定到dgv上

         private void button1_Click(object sender, EventArgs e)
         {
             List<Book> books = new List<Book>();
             //1.读取Excel文件
             using (FileStream fsReder = File.OpenRead("练习.xlsx"))
             {
                 //2.创建工作簿
                 IWorkbook wk = new XSSFWorkbook("练习.xlsx");
                 //IWorkbook wk=new XSSFWorkbook(fsReder);
                 //获取第一个工作表
                 ISheet sheet = wk.GetSheetAt();
                 //3.遍历每一行,行和列的索引都是从0开始
                 for (int i = ; i < sheet.LastRowNum; i++)
                 {
                     IRow row = sheet.GetRow(i);
                     //MessageBox.Show(row.GetCell(0).ToString());
                     //4.读取每一行的数据，加到对象中
                     books.Add(new Book()
                     {
                         Name = row.GetCell().ToString(),
                         One = row.GetCell().ToString(),
                         Two = row.GetCell().ToString(),
                         Three = row.GetCell().ToString(),
                         Four = row.GetCell().ToString(),
                         Five = row.GetCell().ToString(),
                         Six = row.GetCell().ToString(),

                     });
                 }
             }
             //5.绑定数据
             dgv.DataSource = books;
             dgv.AutoGenerateColumns = false;
             dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
             MessageBox.Show("操作完成");
         }

　　2.将数据导入到Excel中

         private void button2_Click(object sender, EventArgs e)
         {
             List<Book> books = new List<Book>()
             {
                 new Book() {Name = "火影忍者",One  ="",Two = "",Three = "",Four = "",Five = "",Six = ""},
                 new Book() {Name = "海贼王",  One ="",Two = "",Three = "",Four = "",Five = "",Six = ""},
                 new Book() {Name = "死神",One  ="",Two = "",Three = "",Four = "",Five = "",Six = ""},
                 new Book() {Name = "游戏王",One  ="",Two = "",Three = "",Four = "",Five = "",Six = ""},
             };
             //1.创建工作簿
             using (FileStream fsWrite = File.OpenWrite("1.xlsx"))
             {
                 IWorkbook wk = new XSSFWorkbook();
                 //2.创建第一个工作表
                 ISheet sheet = wk.CreateSheet("第一张表");
                 //第一行设置标题
                 IRow rowHead = sheet.CreateRow();

                 rowHead.CreateCell().SetCellValue("图书名");
                 rowHead.CreateCell().SetCellValue("一月");
                 rowHead.CreateCell().SetCellValue("二月");
                 rowHead.CreateCell().SetCellValue("三月");
                 rowHead.CreateCell().SetCellValue("四月");
                 rowHead.CreateCell().SetCellValue("五月");
                 rowHead.CreateCell().SetCellValue("六月");

                 //3.在工作表的最后一行下，循环创建工作表的每一行，添加数据
                 for (int i = ; i < books.Count; i++)
                 {
                     IRow row = sheet.CreateRow(i);
                     row.CreateCell().SetCellValue(books[i].Name);
                     row.CreateCell().SetCellValue(books[i].One);
                     row.CreateCell().SetCellValue(books[i].Two);
                     row.CreateCell().SetCellValue(books[i].Three);
                     row.CreateCell().SetCellValue(books[i].Four);
                     row.CreateCell().SetCellValue(books[i].Five);
                     row.CreateCell().SetCellValue(books[i].Six);
                 }
                 wk.Write(fsWrite);
             }

             MessageBox.Show("操作完成");
         }