把DataTable导出到EXCEL

/// <summary>
        /// 把DataTable导出到EXCEL
        /// </summary>
        /// <param name="reportName">报表名称</param>
        /// <param name="dt">数据源表</param>
        /// <param name="saveFileName">Excel全路径文件名</param>
        /// <returns>导出是否成功</returns>
        public bool ExportExcel(DataTable dt, string saveFileName)
        {
            if (dt == null)
            {
                _ReturnStatus = -1;
                _ReturnMessage = "数据集为空！";
                return false;
            }

            bool fileSaved = false;
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            if (xlApp == null)
            {
                _ReturnStatus = -1;
                _ReturnMessage = "无法创建Excel对象，可能您的计算机未安装Excel";
                return false;
            }

            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
            worksheet.Cells.Font.Size = 10;
            Microsoft.Office.Interop.Excel.Range range;

            long totalCount = dt.Rows.Count;
            long rowRead = 0;
            float percent = 0;

            //写入字段
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
                range.Interior.ColorIndex = 15;
                range.Font.Bold = true;

            }
            //写入数值
            for (int r = 0; r < dt.Rows.Count; r++)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = "‘" + dt.Rows[r][i].ToString();
                }
                rowRead++;
                percent = ((float)(100 * rowRead)) / totalCount;
            }

            range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[dt.Rows.Count + 1, dt.Columns.Count]);
            range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
            if (dt.Rows.Count > 0)
            {
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
                range.NumberFormatLocal = "@";
            }
            if (dt.Columns.Count > 1)
            {
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
                range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
                range.NumberFormatLocal = "@";
            }

            //保存文件
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                    fileSaved = true;
                }
                catch (Exception ex)
                {
                    fileSaved = false;
                    _ReturnStatus = -1;
                    _ReturnMessage = "导出文件时出错,文件可能正被打开！\n" + ex.Message;
                }
            }
            else
            {
                fileSaved = false;
            }

            //释放Excel对应的对象
            if (range != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
                range = null;
            }
            if (worksheet != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
                worksheet = null;
            }
            if (workbook != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                workbook = null;
            }
            if (workbooks != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
                workbooks = null;
            }
            xlApp.Application.Workbooks.Close();
            xlApp.Quit();
            if (xlApp != null)
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                xlApp = null;
            }
            GC.Collect();
            return fileSaved;
        }