c#將數據寫入excel導出

1、項目添加引用NPOI包。

 

 

 2、嘗試寫一行數據寫到excel中並導出。

 public static void ExcelTest()
        {
            //導出：將數據庫中的數據，存儲到一個excel中

            //1、查詢數據庫數據  

            //2、  生成excel
            //2_1、生成workbook
            //2_2、生成sheet
            //2_3、遍歷集合，生成行
            //2_4、根據對象生成單元格
            HSSFWorkbook workbook = new HSSFWorkbook();
            //創建工作表
            var sheet = workbook.CreateSheet("信息表");
            //創建標題行（重點）
            var row = sheet.CreateRow(0);
            //創建單元格
            var cellid = row.CreateCell(0);
            cellid.SetCellValue("編號");
            var cellname = row.CreateCell(1);
            cellname.SetCellValue("用戶名");
            var cellpwd = row.CreateCell(2);
            cellpwd.SetCellValue("密碼");
            var celltype = row.CreateCell(3);
            celltype.SetCellValue("類型");

            FileStream file = new FileStream(@"C:\Users\ibm\信息表.xls", FileMode.CreateNew, FileAccess.Write);
            workbook.Write(file);
            file.Dispose();
        }

 

3、運行方法之后。相應代碼內容對應excel表格相應的地方

 

 

 4、現在來模擬把表數據遍歷寫入到excel表格中。

創建表實體

public class User
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public string pwd { get; set; }

        public string type { get; set; }
    }

        public static void ExcelTest()
        {
            //導出：將數據庫中的數據，存儲到一個excel中

            //1、查詢數據庫數據  

            User user1 = new User() { Id = 1, Name = "小明", pwd = "123123", type = "學生" };
            User user2 = new User() { Id = 2, Name = "小紅", pwd = "123123", type = "學生" };
            User user3 = new User() { Id = 3, Name = "小綠", pwd = "123123", type = "學生" };
            User user4 = new User() { Id = 4, Name = "小白", pwd = "123123", type = "老師" };
            User user5 = new User() { Id = 5, Name = "小黑", pwd = "123123", type = "老師" };
            User user6 = new User() { Id = 6, Name = "小藍", pwd = "123123", type = "老師" };
            List<User> list = new List<User>();
            list.Add(user1);
            list.Add(user2);
            list.Add(user3);
            list.Add(user4);
            list.Add(user5);
            list.Add(user6);


            //2、  生成excel
            //2_1、生成workbook
            //2_2、生成sheet
            //2_3、遍歷集合，生成行
            //2_4、根據對象生成單元格
            HSSFWorkbook workbook = new HSSFWorkbook();
            //創建工作表
            var sheet = workbook.CreateSheet("信息表");
            //創建標題行（重點） 從0行開始寫入
            var row = sheet.CreateRow(0);
            //創建單元格
            var cellid = row.CreateCell(0);
            cellid.SetCellValue("編號");
            var cellname = row.CreateCell(1);
            cellname.SetCellValue("用戶名");
            var cellpwd = row.CreateCell(2);
            cellpwd.SetCellValue("密碼");
            var celltype = row.CreateCell(3);
            celltype.SetCellValue("類型");

            //遍歷集合，生成行
            int index = 1; //從1行開始寫入
            for (int i = 0; i < list.Count; i++)
            {
                int x = index + i;
                var rowi = sheet.CreateRow(x);
                var id = rowi.CreateCell(0);
                id.SetCellValue(list[i].Id);
                var name = rowi.CreateCell(1);
                name.SetCellValue(list[i].Name);
                var pwd = rowi.CreateCell(2);
                pwd.SetCellValue(list[i].pwd);
                var type = rowi.CreateCell(3);
                type.SetCellValue(list[i].type);
            }

            FileStream file = new FileStream(@"C:\Users\ibm\信息表.xls", FileMode.CreateNew, FileAccess.Write);
            workbook.Write(file);
            file.Dispose();
        }

5、運行ExcelTest（）方法之后效果。

6、源碼地址： https://gitee.com/linlijie071297/daily_learning.git