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ListViewItem lvSelectItem = this.listView1.SelectedItems[0];//获取选中项
ListViewItem lvDownItem = this.listView1.Items[this.listView1.SelectedItems[0].Index + 1];//获取选中项的下一项
ListViewItem lvUpItem = this.listView1.Items[this.listView1.SelectedItems[0].Index - 1];//获取选中项的上一项