C#导入导出EXCEL文件的代码实例

using System;using System.Data;using System.Data.OleDb;namespace ZFSoft.Joint{    public class ExcelIO    {        private int _ReturnStatus;        private string _ReturnMessage;        /// <summary>        /// 执行返回状态        /// </summary>        public int ReturnStatus        {            get            {                return _ReturnStatus;                            /// <summary>        /// 执行返回信息        /// </summary>        public string ReturnMessage        {            get            {                return _ReturnMessage;                            public ExcelIO()        {                         /// <summary>        /// 导入EXCEL到DataSet        /// </summary>        /// <param name="fileName">Excel全路径文件名</param>        /// <returns>导入成功的DataSet</returns>        public DataTable ImportExcel(string fileName)        {            //判断是否安装EXCEL            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();            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 null;                        //判断文件是否被其他进程使用                       Microsoft.Office.Interop.Excel.Workbook workbook;            try            {                workbook = xlApp.Workbooks.Open(fileName, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, 1, 0);                        catch            {                _ReturnStatus = -1;                _ReturnMessage = "Excel文件处于打开状态，请保存关闭";                return null;                        //获得所有Sheet名称            int n = workbook.Worksheets.Count;            string[] SheetSet = new string
;            System.Collections.ArrayList al = new System.Collections.ArrayList();            for (int i = 1; i <= n; i++)            {                SheetSet[i - 1] = ((Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[i]).Name;                        //释放Excel相关对象            workbook.Close(null, null, null);            xlApp.Quit();            if (workbook != null)            {                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);                workbook = null;                        if (xlApp != null)            {                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);                xlApp = null;                        GC.Collect();            //把EXCEL导入到DataSet            DataSet ds = new DataSet();            DataTable table = new DataTable();            string connStr = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = " + fileName + ";Extended Properties=Excel 8.0";            using (OleDbConnection conn = new OleDbConnection(connStr))            {                conn.Open();                OleDbDataAdapter da;                string sql = "select * from [" + SheetSet[0] + "$] ";                da = new OleDbDataAdapter(sql, conn);                da.Fill(ds, SheetSet[0]);                da.Dispose();                table = ds.Tables[0];                conn.Close();                conn.Dispose();                        return table;                /// <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(string reportName, System.Data.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.Application();            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;            worksheet.Cells[1, 1] = reportName;            ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Size = 12;            ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Bold = true;            //写入字段            for (int i = 0; i < dt.Columns.Count; i++)            {                worksheet.Cells[2, i + 1] = dt.Columns[i].ColumnName;                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[2, 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 + 3, i + 1] = dt.Rows[r][i].ToString();                                rowRead++;                percent = ((float)(100 * rowRead)) / totalCount;                        range = worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[dt.Rows.Count + 2, 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;                        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;                        //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;