调用com+组件传回DataSet值

 private void button1_Click(object sender, System.EventArgs e)
  {
   try
   {
    //    CS_RST2 rst = new CS_RST2();
    Type objTypeRST2 = Type.GetTypeFromProgID("CS_STReport.CS_RST2");
    object comRST2 = Activator.CreateInstance(objTypeRST2); 

    DataSet  ds = new DataSet();
    ds = null;
    bool b ;
    object[] o;     
    o = new object[]{"017","","","","","","","20040503","20080915", ds};        
    
    b =(bool)objTypeRST2.InvokeMember("getRST270ReportRS",
     BindingFlags.Default | BindingFlags.InvokeMethod,
     null,comRST2,o);
    DataSet ds1 = (DataSet)o.GetValue(9);//关键
    if(ds1==null)
    {     
     MessageBox.Show("ds is null!");
    }
    else
    {     
     dataGrid1.DataSource = ds1.Tables[0].DefaultView;
    }
    
   }