c＃如何检查listview1中的选定项是否已经在listview2中以防止重复？

Question

如果我在listview1中选择的行已经在listview2中，我如何验证我的listview2？我不明白listView1.Items.Contains（）和ContainKey（）

这是我在listview1中获取所选行的代码：

 private void listView1_DoubleClick(object sender, EventArgs e)
    {
        if (listView1.SelectedItems.Count > 0)
        {
            foreach (ListViewItem item in listView1.SelectedItems)
            { 
                //how do i condition this selected item? to prevent inserting same items in the listview2
                listView2.Items.Add((ListViewItem)item.Clone());//cloning the item to insert in listview2

            }
        }

    }

如何将listview1中的选定行与项目listview2进行比较？

Answer 1

如果您的listView1项是字符串列表，则可以使用

private void listView1_DoubleClick(object sender, EventArgs e)
{
    // You don't need to check:  if (listView1.SelectedItems.Count > 0)
    foreach (ListViewItem item in listView1.SelectedItems)
    {
        bool isExist = false;
        foreach (ListViewItem item2 in listView2.Items)
        {
            if (item2.Text == item.Text) // Compare Text
            //if (item2.ImageKey == item.ImageKey) // Compare Key. If you don't use key then ignore this line
            {
                isExist = true;
                break;
            }
        }
        if (!isExist) listView2.Items.Add((ListViewItem)item.Clone());
    }
}

Answer 2

private void listView1_DoubleClick(object sender, EventArgs e)
{
   if (listView1.SelectedItems.Count > 0)
   {
       foreach (ListViewItem item in listView1.SelectedItems)
       { 
          if(!listView2.Items.Contains(item)) //verify text and value. if don't contain add
              listView2.Items.Add((ListViewItem)item.Clone());

      }
   }

}