C# listview之点击空白区仍然不失去选中项的状态

private void listView1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
WizardBase.IntermediateStep inter = (wizardControl1.WizardSteps[wizardControl1.CurrentStepIndex] as WizardBase.IntermediateStep);
if (listView1.SelectedItems.Count > 0)
{
//if (ListViewTmpIndex != -1)
//{
//    listView1.Items[ListViewTmpIndex].Selected = false;
//}
//ListViewTmpIndex = listView1.Items[listView1.SelectedIndices[0]].Index;
switch (listView1.Items[listView1.SelectedIndices[0]].Index)
{
case 0:
//TODO:File
if (inter != null)
{
inter.Subtitle = "打开一个或多个文件";
inter.Refresh();
}
break;
case 1:
//TODO:Oracle
if (inter != null)
{
inter.Subtitle = "连接一个OracleSpatial服务";
inter.Refresh();
}
//wizardControl1.
break;
case 2:
//TODO:PostgreSql
if (inter != null)
{
inter.Subtitle = "连接一个PostGIS服务";
inter.Refresh();
}
break;
case 3:
//TODO:ArcSDE
if (inter != null)
{
inter.Subtitle = "连接一个Arc SDE服务";
inter.Refresh();
}
break;
case 4:
//TODO:SQLServer
if (inter != null)
{
inter.Subtitle = "连接一个SQLServer服务";
inter.Refresh();
}
break;
default:
break;
}//switch 选中的行
}
else if (listView1.SelectedItems.Count <= 0)//点击空白区
{
if (this.listView1.FocusedItem != null)
{
ListViewItem item = this.listView1.GetItemAt(e.X, e.Y);
if (item == null)
{
this.listView1.FocusedItem.Selected = true;
}
}
}
}//left_button_up
}//listView1_MouseUp