递归加载目录

public void LoadTree(string path, TreeNode node = null) {

string[] dirs = Directory.GetDirectories(path);
foreach (var dir in dirs) {
TreeNode node1 = new TreeNode(Path.GetFileName(dir));
if (node == null) {
//首次加载在treeview控件上
treeView1.Nodes.Add(node1);
}
else {
node.Nodes.Add(node1);
}
if (Directory.GetDirectories(dir).Length > 0) {
//递归循环加载子目录
LoadTree(dir, node1);
}
}
}