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,false,5,"",Microsoft.Office.Interop.Excel.XlPlatform.xlWindows,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[n];
            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;
        }
    }
}