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private void listView1_MouseDoubleClick(object sender, MouseEventArgs e)
{
ListViewHitTestInfo li = listView1.HitTest(e.Location);
if (li != null && li.Item != null)
li.Item.Checked = !li.Item.Checked; //改这样
}
private void listView1_MouseDoubleClick(object sender, MouseEventArgs e)
{
ListViewHitTestInfo li = listView1.HitTest(e.Location);
if (li != null && li.Item!=null)
li.Item.Checked = true;
}