EXCEL的导入导出

 using System;
 using System.Data;
 using System.Data.OleDb;
 using System.IO;

 namespace COMMON
 {
     public class Excel_OutputInput
     {
         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 Excel_OutputInput()
         {
         }

         /// <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 = -;
                 _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, , "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, , true, , );
             }
             catch
             {
                 _ReturnStatus = -;
                 _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 = ; i <= n; i++)
             {
                 SheetSet[i - ] = ((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 conStr;
             FileInfo file = new FileInfo(fileName);
             string extention = file.Extension;
             switch (extention)
             {
                 case ".xls":
                     conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties=Excel 8.0";
                     break;
                 case ".xlsx":
                     conStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=Excel 12.0";
                     break;
                 default:
                     conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties=Excel 8.0";
                     break;
             }

             //string connStr = " Provider = Microsoft.Jet.OLEDB.12.0 ; Data Source = " + fileName + ";Extended Properties=Excel 12.0";
             using (OleDbConnection conn = new OleDbConnection(conStr))
             {
                 conn.Open();
                 OleDbDataAdapter da;
                 string sql = "select * from [" + SheetSet[] + "$] ";
                 da = new OleDbDataAdapter(sql, conn);
                 da.Fill(ds, SheetSet[]);
                 da.Dispose();
                 table = ds.Tables[];
                 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 = -;
                 _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 = -;
                 _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[];//取得sheet1
             worksheet.Cells.Font.Size = ;
             Microsoft.Office.Interop.Excel.Range range;

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

             worksheet.Cells[, ] = reportName;
             ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[, ]).Font.Size = ;
             ((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[, ]).Font.Bold = true;

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

             }
             //写入数值
             for (int r = ; r < dt.Rows.Count; r++)
             {
                 for (int i = ; i < dt.Columns.Count; i++)
                 {
                     worksheet.Cells[r + , i + ] = dt.Rows[r][i].ToString();
                 }
                 rowRead++;
                 percent = ((float)( * rowRead)) / totalCount;
             }
             range = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[dt.Rows.Count + , 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 > )
             {
                 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 > )
             {
                 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 = -;
                     _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;
         }
     }
 }