不用gridview将查询结果导出到excel

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 private SQLHelper sqlhelper;
     
          
        public 将SQL数据导出到EXCEL中2()
        {
            InitializeComponent();
            sqlhelper = new SQLHelper();
        }

        public DataTable data()
        {
            string sql = "select * from sheet1";

            DataTable dt = sqlhelper.ExecuteQuery(sql, CommandType.Text);
            return dt;

        }

 


        private void button1_Click(object sender, EventArgs e)
        {
            DataTable dt = data();
           // dataGridView1.DataSource = dt;
            if (dt.Rows.Count == 0)//判断是否有数据
                return;//返回
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();//实例化Excel对象
            excel.Application.Workbooks.Add(true);//在Excel中添加一个工作簿
            excel.Visible = true;//设置Excel显示
            //生成字段名称
            //for (int i = 0; i < dt.Columns.Count; i++)
            //{
            //    excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;//将数据表格控件中的列表头填充到Excel中
            //}
            //填充数据
            for (int i = 1; i <= dt.Rows.Count; i++)//遍历数据表格控件的所有行
            {
                for (int j = 1; j<= dt.Columns.Count; j++)//遍历数据表格控件的所有列
                {


                    //if (dt.Rows[j][i].ValueType == typeof(string))//判断遍历到的数据是否是字符串类型
                    //{
                    //    excel.Cells[i + 2, j] = "'" + dt.Rows[j][i].ToString();//填充Excel表格
                    //}
                    //else
                    //{
                        excel.Cells[i, j] = dt.Rows[i-1][j-1].ToString();//填充Excel表格
                    //}

                        //string str1 = dt.Rows[i][j].ToString();
                        //excel.Cells[i + 2, j] = "'" + str1;

                }
            }

            //excel.Save();//保存excel文件        
            //excel.Quit();//确保Excel进程关闭
            //excel.Visible = true;// 前台可见 后台运行
            //excel = null;

        }

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