//选中行的索引
int index = listview.SelectedIndices[0];
//选中行的值
ListViewItem selecteditem =listview.Items[index];
//选中行的第一列的值
string onetext = listview.Items[index].SubItems[1].Text;
if (listView1.SelectedIndices.Count > 0)
{
ListViewItem selecteditem = listView1.Items[listView1.SelectedIndices[0]];
}