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string aaa = "";
//如果选中
if (comboBoxDept.SelectedIndex > -1)
{
aaa = comboBoxDept.Items[comboBoxDept.SelectedIndex].ToString();//方法1
aaa = comboBoxDept.SelectedItem.ToString();//方法2
}
MessageBox.Show(aaa);
comboBoxDept.SelectedItem.ToString();