/// <summary> 
      /// 导出速度最快 
      /// </summary> 
      /// <param name="list"><列名，数据></param> 
      /// <param name="filepath"></param> 
      /// <returns></returns> 
      public bool NewExport(List<DictionaryEntry> list, string filepath) 
      { 
        bool bSuccess = true; 
        Microsoft.Office.Interop.Excel.Application appexcel = new Microsoft.Office.Interop.Excel.Application(); 
        System.Reflection.Missing miss = System.Reflection.Missing.Value; 
        appexcel = new Microsoft.Office.Interop.Excel.Application(); 
        Microsoft.Office.Interop.Excel.Workbook workbookdata = null; 
        Microsoft.Office.Interop.Excel.Worksheet worksheetdata = null; 
        Microsoft.Office.Interop.Excel.Range rangedata; 
   
        workbookdata = appexcel.Workbooks.Add(); 
   
        //设置对象不可见 
        appexcel.Visible = false; 
        appexcel.DisplayAlerts = false; 
        try 
        { 
          foreach (var lv in list) 
          { 
            var keys = lv.Key as List<string>; 
            var values = lv.Value as List<IList<object>>; 
            worksheetdata = (Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets.Add(miss, workbookdata.ActiveSheet); 
   
            for (int i = 0; i < keys.Count-1; i++) 
            { 
              //给工作表赋名称 
              worksheetdata.Name = keys[0];//列名的第一个数据位表名 
              worksheetdata.Cells[1, i + 1] = keys[i+1]; 
            } 
   
            //因为第一行已经写了表头，所以所有数据都应该从a2开始 
            rangedata = worksheetdata.get_Range("a2", miss); 
            Microsoft.Office.Interop.Excel.Range xlrang = null; 
   
            //irowcount为实际行数，最大行 
            int irowcount = values.Count; 
            int iparstedrow = 0, icurrsize = 0; 
   
            //ieachsize为每次写行的数值，可以自己设置 
            int ieachsize = 10000; 
   
            //icolumnaccount为实际列数，最大列数 
            int icolumnaccount = keys.Count-1; 
   
            //在内存中声明一个ieachsize×icolumnaccount的数组，ieachsize是每次最大存储的行数，icolumnaccount就是存储的实际列数 
            object[,] objval = new object[ieachsize, icolumnaccount]; 
            icurrsize = ieachsize; 
   
            while (iparstedrow < irowcount) 
            { 
              if ((irowcount - iparstedrow) < ieachsize) 
                icurrsize = irowcount - iparstedrow; 
   
              //用for循环给数组赋值 
              for (int i = 0; i < icurrsize; i++) 
              { 
                for (int j = 0; j < icolumnaccount; j++) 
                { 
                  var v = values[i + iparstedrow][j]; 
                  objval[i, j] = v != null ? v.ToString() : ""; 
                } 
              } 
              string X = "A" + ((int)(iparstedrow + 2)).ToString(); 
              string col = ""; 
              if (icolumnaccount <= 26) 
              { 
                col = ((char)('A' + icolumnaccount - 1)).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); 
              } 
              else 
              { 
                col = ((char)('A' + (icolumnaccount / 26 - 1))).ToString() + ((char)('A' + (icolumnaccount % 26 - 1))).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); 
              } 
              xlrang = worksheetdata.get_Range(X, col); 
              xlrang.NumberFormat = "@"; 
              // 调用range的value2属性，把内存中的值赋给excel 
              xlrang.Value2 = objval; 
              iparstedrow = iparstedrow + icurrsize; 
            } 
          } 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet1"]).Delete(); 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet2"]).Delete(); 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet3"]).Delete(); 
          //保存工作表 
          workbookdata.SaveAs(filepath, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss); 
          workbookdata.Close(false, miss, miss); 
          appexcel.Workbooks.Close(); 
          appexcel.Quit(); 
   
          System.Runtime.InteropServices.Marshal.ReleaseComObject(workbookdata); 
          System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel.Workbooks); 
          System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel); 
          GC.Collect(); 
        } 
        catch (Exception ex) 
        { 
          ErrorMsg = ex.Message; 
          bSuccess = false; 
        } 
        finally 
        { 
          if (appexcel != null) 
          { 
            ExcelImportHelper.KillSpecialExcel(appexcel); 
          } 
        } 
        return bSuccess; 
      }

range.NumberFormatLocal = "@";   //设置单元格格式为文本   
  
range = (Range)worksheet.get_Range("A1", "E1");   //获取Excel多个单元格区域：本例做为Excel表头   
  
range.Merge(0);   //单元格合并动作   
  
worksheet.Cells[1, 1] = "Excel单元格赋值";   //Excel单元格赋值   
  
range.Font.Size = 15;   //设置字体大小   
  
range.Font.Underline=true;   //设置字体是否有下划线   
  
range.Font.Name="黑体";    设置字体的种类   
  
range.HorizontalAlignment=XlHAlign.xlHAlignCenter;   //设置字体在单元格内的对其方式   
  
range.ColumnWidth=15;   //设置单元格的宽度   
  
range.Cells.Interior.Color=System.Drawing.Color.FromArgb(255,204,153).ToArgb();   //设置单元格的背景色   
  
range.Borders.LineStyle=1;   //设置单元格边框的粗细   
  
range.BorderAround(XlLineStyle.xlContinuous,XlBorderWeight.xlThick,XlColorIndex.xlColorIndexAutomatic,System.Drawing.Color.Black.ToArgb());   //给单元格加边框   
  
range.Borders.get_Item(Microsoft.Office.Interop.Excel.XlBordersIndex.xlEdgeTop).LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlLineStyleNone; //设置单元格上边框为无边框   
  
range.EntireColumn.AutoFit();   //自动调整列宽   
  
Range.HorizontalAlignment= xlCenter;   // 文本水平居中方式   
  
Range.VerticalAlignment= xlCenter   //文本垂直居中方式   
  
Range.WrapText=true;   //文本自动换行   
  
Range.Interior.ColorIndex=39;   //填充颜色为淡紫色   
  
Range.Font.Color=clBlue;   //字体颜色   
  
xlsApp.DisplayAlerts=false;  //对Excel的操作 不弹出提示信息 
ApplicationClass xlsApp = new ApplicationClass(); // 1. 创建Excel应用程序对象的一个实例，相当于我们从开始菜单打开Excel应用程序。 
if (xlsApp == null) 
{ 
//对此实例进行验证，如果为null则表示运行此代码的机器可能未安装Excel 
} 

Workbook workbook = xlsApp.Workbooks.Open(excelFilePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); 
Worksheet mySheet = workbook.Sheets[1] as Worksheet; //第一个sheet页 
mySheet.Name = "testsheet"; //这里修改sheet名称 

mySheet.Copy(Type.Missing, workbook.Sheets[1]);
//复制mySheet成一个新的sheet页，复制完后的名称是mySheet页名称后加一个(2)，这里就是testsheet(2)，复制完后，Worksheet的数量增加一个

xlsApp.DisplayAlerts = false; //如果想删除某个sheet页，首先要将此项设为fasle。 
(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Delete();