treenode
private void TreeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
foreach (TreeNode tn in e.Node.Nodes)
{
if (Directory.Exists(tn.Name))
{
DirectoryInfo dirinfo = new DirectoryInfo(tn.Name);
tn.Nodes.Clear();
try
{
foreach (DirectoryInfo subdir in dirinfo.GetDirectories())
{
TreeNode subnode = new TreeNode(subdir.Name);
subnode.Name = subdir.FullName;
subnode.ImageIndex = 2;
subnode.SelectedImageIndex = 2;
tn.Nodes.Add(subnode);
}
}
catch
{ }
}
}
}
整个代码(主要一句foreach)看来都是在内存中进行的吗,为什么我们还能在 屏幕中(treeview) 看到产生新的实例呢???请给出详解。