如何检查数据表是否包含anyrow

Question

I am trying to check IF datatable contains anyrow ,I am using below code to do this ,But now even if this GetReferralDrName() method does not return any value still control is going to foreach loop ,what is the right way to do this

DataTable dt = DBHandling.GetReferralDrName();
            if (dt != null)
            {
                foreach (DataRow dr in dt.Rows)
                {
                    cmbReferralDr.Items.Add(dr["LastName"].ToString() + " " + dr["FirstName"].ToString());
                } 
            }      

Answer 1

If there are no rows, there is no harm in getting to the foreach step. As it will just jump over that when there are no records in the datatable. But you could do this:

DataTable dt = DBHandling.GetReferralDrName();
if (dt != null && dt.Rows.Count > 0)
{
    foreach (DataRow dr in dt.Rows)
    {
        cmbReferralDr.Items.Add(dr["LastName"].ToString() + " " + dr["FirstName"].ToString());
    } 
} 

Answer 2

I don't see any problem.So try to check dt.Rows.Count .

if(dt!=null)
{
  if(dt.Rows.Count>0)
  {
    //Your Other Code
  }
}