C# 使用Winform 获取下拉框 选中的值

string PrintName = cmbPrinter.SelectedIndex.ToString();
 PrintName = cmbPrinter.SelectedItem.ToString(); //
 if (cmbPrinter.SelectedIndex != 0)
 {
 }
 string PrintName = "";
 PrintName = cmbPrinter.SelectedItem.ToString(); //"Gprinter GP-1124T0"
 var ss0 = cmbPrinter.Text; //Gprinter GP-1124T0"
 var ss = cmbPrinter.SelectedIndex.ToString(); // 0

//循环下拉框
  string ptr = dals.SelectContentByID(1); //查询系统表中 打印机名称
  for (int i = 0; i < cmbPrinter.Items.Count; i++)
  {
    if (cmbPrinter.Items[i].ToString() == ptr)
    {
 cmbPrinter.SelectedIndex = i;
 break;
    }
  }

combobox.Text;

combobox.SelectedItem;