object hrexcel;

Type excelType = Type.GetTypeFromProgID("Excel.Application");
hrexcel = Activator.CreateInstance(excelType);
SetObjPeoperty(hrexcel,"Visible","true");
SetObjPeoperty(hrexcel,"UserControl","true");
object workbooks=GetObjPeoperty(hrexcel,"Workbooks");
object xBk =CallObjMethod(workbooks,"Add",new object[]{true});
object excelSheet=GetObjPeopertyWithParam(xBk,"Worksheets",new object[]{1});
object[] agr2 = new object[2] { 1, 1 };
object excelcellcell=GetObjPeopertyWithParam(excelSheet,"Cells",agr2);

为什么最后这个方法一直提示 未知的名称 ？请大家帮忙