C# 怎么获取 EXecl 表格中有多少个工作薄

[影子_爱人]

如题

[liherun]

string   sFileName   =   @"c:\a.xls";   
  object   missing=Missing.Value;   
  Excel.Application   excelApp   =   new   Excel.Application();   
  excelApp.Workbooks.Open(sFileName,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing,missing);     
  for(int   i=0;i<excelApp.Workbooks[1].Worksheets.Count;i++)   
  {   
  Excel.Worksheet   ws   =   (Excel.Worksheet)excelApp.Workbooks[1].Worksheets[i+1];   
  string   sSheetName   =   ws.Name;   
  }

[qqzeng-ip]

难

[影子_爱人]

问下 liherun
object missing=Missing.Value;
这句话是干吗的