C#  将dataset里面的数据导入到excel  谢谢!!!
我有一个dataset里面  里面肯能有table0,table1,talble2......
我需要把这个数据分别保存到excel里面的sheet1,sheet2,sheet3.....里面去,
需要怎么做?请高手赐教!请给出代码提示!谢谢!
------解决方案--------------------用ado.net,把excel作为一个数据库写入,
------解决方案--------------------连接字符串:
               String strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source="+strExcelFilename+";" + "Extended Properties=Excel 8.0;";
用sql语句create table创建sheet:
               "CREATE TABLE TestSheet ([ID] INTEGER,[Username] VarChar,[UserPwd] VarChar)";
然后插入就是普通的insert into语句了,
------解决方案--------------------table循环对应sheet
for(int i=0;i<dataSet.Tables.Count;i++)
{
   //根据i索引导入excel
}
------解决方案--------------------protected void AddExcel(DataSet ds, ref bool s)
       {
           try
           {
                System.Data.DataTable dt = ds.Tables[0];
             // string fileName ="C:\\数据处理文件夹\\"+ Guid.NewGuid() + ".xls";
                //string str = DateTime.Now.ToShortDateString();
              // string[] strar=str.Split(' ');
              // string str1 =strar[0]+strar[1];  
                SaveFileDialog sf = new SaveFileDialog();
                sf.InitialDirectory = "C:\\";
                sf.Filter = "excel文件(*.xls)|*.xls";               
              if (sf.ShowDialog()==DialogResult.OK)
             {
                 string fileName = sf.FileName; //"C:\\数据处理文件夹\\" +str+ ".xls";
               Excel.Application excel = new Excel.ApplicationClass();
               int rowIndex = 1;
               int colIndex = 0;
               excel.Application.Workbooks.Add(true);
               foreach (DataColumn col in dt.Columns)
               {
                   colIndex++;
                   excel.Cells[1, colIndex] = col.ColumnName;
               }
               foreach (DataRow row in dt.Rows)
               {
                   rowIndex++;
                   colIndex = 0;
                   for (colIndex = 0; colIndex < dt.Columns.Count; colIndex++)
                   {
                       excel.Cells[rowIndex, colIndex + 1] = row[colIndex].ToString();
                   }
               }
               excel.Visible = false;
              // excel.ActiveWorkbook.s
               excel.ActiveWorkbook.SaveAs(fileName, Excel.XlFileFormat.xlExcel9795, null, null, false, false, Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null, null);
               //excel.Save(fileName);  
               excel.Quit();
               excel = null;
               GC.Collect();//垃圾回收
           }
           }
           catch
           {
               s = false;
           }
      // }
       }
------解决方案--------------------   /// <summary>
       /// DataTable直接导出Excel,此方法会把DataTable的数据用Excel打开,再自己手动去保存到确切的位置
       /// </summary>
       /// <param name="dt">要导出Excel的DataTable</param>
       /// <returns></returns>
       public static void ExportExcel(System.Data.DataTable table, string savePath, bool isExit)
       {
           if (!isExit)//保存路径是否存在
               File.Copy(System.Windows.Forms.Application.StartupPath + @"\Excel\Excel.xls", savePath);
           _Excel.Application app = new _Excel.ApplicationClass();