datatable转到Excel

 public static void DataTabletoExcel(System.Data.DataTable tmpDataTable, string strFileName)
        {
            if (tmpDataTable == null )
                return;
            int rowNum = tmpDataTable.Rows.Count;
            int columnNum = tmpDataTable.Columns.Count;
            int rowIndex = 1;
            int columnIndex = 0;

            Microsoft.Office.Interop.Excel. Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            xlApp.DefaultFilePath = "";
            xlApp.DisplayAlerts = true;
            xlApp.SheetsInNewWorkbook = 1;
            Workbook xlBook = xlApp.Workbooks.Add(true );

            //将DataTable的列名导入Excel表第一行
            foreach (DataColumn dc in tmpDataTable.Columns)
            {
                columnIndex++;
                xlApp.Cells[rowIndex, columnIndex] = dc.ColumnName;
            }

            //将DataTable中的数据导入Excel中
            for (int i = 0; i < rowNum; i++)
            {
                rowIndex++;
                columnIndex = 0;
                for (int j = 0; j < columnNum; j++)
                {
                    columnIndex++;
                    xlApp.Cells[rowIndex, columnIndex] = tmpDataTable.Rows[i][j].ToString();
                }
            }
            //xlBook.SaveCopyAs(HttpUtility.UrlDecode(strFileName, System.Text.Encoding.UTF8));
            //xlBook.SaveCopyAs(strFileName);
        }