private void mainMapControl_OnViewRefreshed(object sender, IMapControlEvents2_OnViewRefreshedEvent e)
{
var visiblelayers = LayerUtil.GetVisibleLayers(mainMapControl.Map);
var nowvisiblecount = visiblelayers.Count();
if (nowvisiblecount != _visibleLayerCount)//可见图层变化重新加载目标图层
{
createFeatureControl1.RefreshTreeListData();
}
if (nowvisiblecount == 0)
{
TargetLayerChanged(new TargetLayerChangedEvent(null));
}
_visibleLayerCount = nowvisiblecount;
}