/// <summary>
/// //Check ListView时发生的事件，点选Root不发生改变，点选ChildNode使Layer改变其可见与否
/// </summary>
private void treeViewLayers_AfterCheck(object sender, TreeViewEventArgs e)
{
if (e.Node.Parent == null && !e.Node.Checked) //Map根节点的不可取消显示
{
e.Node.Checked = true;
}
else
{
myMap.ChangeSelectedLayerVisible(e.Node.Index); //改变空间数据的显示与否
}
UpdateMapImg(); //更新视图
}