C#从datatable或dategridview导出到excel

1.datatable

   

DataTable dtqzh= Service.getTableBySql("select * from  table where");

 if (dtqzh != null && dtqzh.Rows.Count > 0)

{

      this.outLoadExcel(dtqzh);                            

}



 private void outLoadExcel(DataTable dtqzh)

        {

            if (dtqzh.Rows.Count <= 0)

            {

                MessageBox.Show("没有可供导出的数据");

                return;

            }



            //创建Excel对象

            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

            excel.Application.Workbooks.Add(true);

            excel.Visible = true;

            //生成字段，即添加表头

            for (int i = 0; i < dtqzh.Columns.Count; i++)

            {

                excel.Cells[1, i + 1] = dtqzh.Columns[i].ColumnName;

            }

            //填充内容

            for (int i = 0; i < dtqzh.Rows.Count; i++)

            {

                for (int j = 0; j < dtqzh.Columns.Count; j++)

                {

                    if (dtqzh.Rows[i][j] == null)

                    {

                        excel.Cells[i + 2, j + 1] = "";

                    }

                    else

                    {

                        excel.Cells[i + 2, j + 1] = dtqzh.Rows[i][j].ToString();

                    }

                }

            }



        }

2.datagridview

private void outLoadExcel(DataGridView dgv)

        {

            if (dgv.Rows.Count <= 0)

            {

                MessageBox.Show("没有可供导出的数据");

                return;

            }



            //创建Excel对象

            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

            excel.Application.Workbooks.Add(true);

            excel.Visible = true;

            //生成字段，即添加表头

            for (int i = 0; i < dgv.Columns.Count; i++)

            {

                excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;

            }

            //填充内容

            for (int i = 0; i < dgv.Rows.Count; i++)

            {

                for (int j = 0; j < dgv.Columns.Count; j++)

                {

                    if (dgv[j, i].Value==null)

                    {

                        excel.Cells[i + 2, j + 1] = "";

                    }

                    else if (dgv[j,i].ValueType==typeof(string))

                    {

                        excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();

                    }

                    else

                    {

                        excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();

                    }

                }

            }

            

        }