如何检查DataReader是否包含数据？

Question

我再次检查DataReader对象是否有数据有问题？

Dim cmd as SqlCommand
Dim drd as SqlDataReader

      cmd = New SqlCommand ("SELECT * FROM Stock", conx)
      drd = cmd.ExecuteReader()

      ''HERE I WOULD LIKE TO CHECK WHETHER drd has Data or not

     While (drd.Read())
     {
          txtName.Text = drd.Item("StockName")
     }

我该怎么检查？请帮我!谢谢大家!

Answer 1

if(drd.HasRows)
{
   //....
}