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

 1         private void button1_Click(object sender, EventArgs e)
 2         {
 3             List<Book> books = new List<Book>();
 4             //1.读取Excel文件
 5             using (FileStream fsReder = File.OpenRead("练习.xlsx"))
 6             {
 7                 //2.创建工作簿
 8                 IWorkbook wk = new XSSFWorkbook("练习.xlsx");
 9                 //IWorkbook wk=new XSSFWorkbook(fsReder);
10                 //获取第一个工作表
11                 ISheet sheet = wk.GetSheetAt(0);
12                 //3.遍历每一行,行和列的索引都是从0开始
13                 for (int i = 3; i < sheet.LastRowNum; i++)
14                 {
15                     IRow row = sheet.GetRow(i);
16                     //MessageBox.Show(row.GetCell(0).ToString());
17                     //4.读取每一行的数据，加到对象中
18                     books.Add(new Book()
19                     {
20                         Name = row.GetCell(0).ToString(),
21                         One = row.GetCell(1).ToString(),
22                         Two = row.GetCell(2).ToString(),
23                         Three = row.GetCell(3).ToString(),
24                         Four = row.GetCell(4).ToString(),
25                         Five = row.GetCell(5).ToString(),
26                         Six = row.GetCell(6).ToString(),
27 
28                     });
29                 }
30             }
31             //5.绑定数据
32             dgv.DataSource = books;
33             dgv.AutoGenerateColumns = false;
34             dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
35             MessageBox.Show("操作完成");
36         }

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　　2.将数据导入到Excel中

 1         private void button2_Click(object sender, EventArgs e)
 2         {
 3             List<Book> books = new List<Book>()
 4             {
 5                 new Book() {Name = "火影忍者",One  ="34",Two = "56",Three = "67",Four = "78",Five = "99",Six = "54"},
 6                 new Book() {Name = "海贼王",  One ="64",Two = "79",Three = "97",Four = "74",Five = "29",Six = "56"},
 7                 new Book() {Name = "死神",One  ="94",Two = "51",Three = "57",Four = "64",Five = "90",Six = "74"},
 8                 new Book() {Name = "游戏王",One  ="94",Two = "30",Three = "56",Four = "45",Five = "58",Six = "46"},
 9             };
10             //1.创建工作簿
11             using (FileStream fsWrite = File.OpenWrite("1.xlsx"))
12             {
13                 IWorkbook wk = new XSSFWorkbook();
14                 //2.创建第一个工作表
15                 ISheet sheet = wk.CreateSheet("第一张表");
16                 //第一行设置标题
17                 IRow rowHead = sheet.CreateRow(0);
18 
19                 rowHead.CreateCell(0).SetCellValue("图书名");                
20                 rowHead.CreateCell(1).SetCellValue("一月");              
21                 rowHead.CreateCell(2).SetCellValue("二月");           
22                 rowHead.CreateCell(3).SetCellValue("三月");
23                 rowHead.CreateCell(4).SetCellValue("四月");
24                 rowHead.CreateCell(5).SetCellValue("五月");
25                 rowHead.CreateCell(6).SetCellValue("六月");
26 
27                 //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
28                 for (int i = 1; i < books.Count; i++)
29                 {
30                     IRow row = sheet.CreateRow(i);
31                     row.CreateCell(0).SetCellValue(books[i].Name);
32                     row.CreateCell(1).SetCellValue(books[i].One);
33                     row.CreateCell(2).SetCellValue(books[i].Two);
34                     row.CreateCell(3).SetCellValue(books[i].Three);
35                     row.CreateCell(4).SetCellValue(books[i].Four);
36                     row.CreateCell(5).SetCellValue(books[i].Five);
37                     row.CreateCell(6).SetCellValue(books[i].Six);
38                 }
39                 wk.Write(fsWrite);
40             }
41 
42             MessageBox.Show("操作完成");
43         }

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