类继承下来就行了
class MyListViewSubItem : ListViewItem.ListViewSubItem
{
public string myProperty { get; set; }
}
var item = new ListViewItem { Text = "111111" };
item.SubItems.Add(new MyListViewSubItem { Name = "3213123", Text = "asdfajd", myProperty = "2222" });
listView1.Items.Add(item);
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