c#将数据写入excel导出

 public static void ExcelTest()
        {
            //导出：将数据库中的数据，存储到一个excel中

            //1、查询数据库数据  

            //2、  生成excel
            //2_1、生成workbook
            //2_2、生成sheet
            //2_3、遍历集合，生成行
            //2_4、根据对象生成单元格
            HSSFWorkbook workbook = new HSSFWorkbook();
            //创建工作表
            var sheet = workbook.CreateSheet("信息表");
            //创建标题行（重点）
            var row = sheet.CreateRow(0);
            //创建单元格
            var cellid = row.CreateCell(0);
            cellid.SetCellValue("编号");
            var cellname = row.CreateCell(1);
            cellname.SetCellValue("用户名");
            var cellpwd = row.CreateCell(2);
            cellpwd.SetCellValue("密码");
            var celltype = row.CreateCell(3);
            celltype.SetCellValue("类型");

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

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()
        {
            //导出：将数据库中的数据，存储到一个excel中

            //1、查询数据库数据  

            User user1 = new User() { Id = 1, Name = "小明", pwd = "123123", type = "学生" };
            User user2 = new User() { Id = 2, Name = "小红", pwd = "123123", type = "学生" };
            User user3 = new User() { Id = 3, Name = "小绿", pwd = "123123", type = "学生" };
            User user4 = new User() { Id = 4, Name = "小白", pwd = "123123", type = "老师" };
            User user5 = new User() { Id = 5, Name = "小黑", pwd = "123123", type = "老师" };
            User user6 = new User() { Id = 6, Name = "小蓝", pwd = "123123", type = "老师" };
            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、遍历集合，生成行
            //2_4、根据对象生成单元格
            HSSFWorkbook workbook = new HSSFWorkbook();
            //创建工作表
            var sheet = workbook.CreateSheet("信息表");
            //创建标题行（重点） 从0行开始写入
            var row = sheet.CreateRow(0);
            //创建单元格
            var cellid = row.CreateCell(0);
            cellid.SetCellValue("编号");
            var cellname = row.CreateCell(1);
            cellname.SetCellValue("用户名");
            var cellpwd = row.CreateCell(2);
            cellpwd.SetCellValue("密码");
            var celltype = row.CreateCell(3);
            celltype.SetCellValue("类型");

            //遍历集合，生成行
            int index = 1; //从1行开始写入
            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();
        }