Node.Expand(); 这个方法为什么前台显示还是没有展开

Question

请高手帮忙解决，代码如下：
public static void CheckTreeNode(string FID, TreeNodeCollection nodes)
{
DataTable dt = Table_FeatMenu_Query();
DataView dvTree = new DataView(dt);
dvTree.RowFilter = "[parent_id] = " + FID;
foreach (DataRowView Row in dvTree)
{
TreeNode Node = new TreeNode();// 添加节点
Node.Text = Row["Feat_name"].ToString();
Node.Tag = Row["Feat_id"].ToString().Trim();
if (Row["type"].ToString() == "Group")
{
Node.ForeColor = System.Drawing.Color.Red;
Node.ImageIndex=5;
Node.Expand();
}
if (Row["type"].ToString() == "Menu")
{
Node.ForeColor = System.Drawing.Color.Blue;
Node.ImageIndex = 6;
**** Node.Expand();****
}
if (Row["type"].ToString() == "Button")
{
Node.ForeColor = System.Drawing.Color.RoyalBlue;
Node.ImageIndex = 18;
}
nodes.Add(Node);
CheckTreeNode(Row["Feat_id"].ToString(), Node.Nodes); //再次递归
}
}

Answer 1

你要先添加childnodes后，再用expand展开