我需要在我的代码上动态生成几个treeview,并希望能够按需加载节点。我有以下代码结构。我的问题是SelectedNodeChanged事件,因为填充的TreeView节点不会触发。在代码示例下面运行后,如果将子节点扩展到多个级别,然后单击子节点,则标签将不显示文本,并且填充的节点将折叠。任何想法都表示赞赏!
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class TreeViewTest : System.Web.UI.Page
{
private const int Count = 2;
private string[] codeList = { "th", "os" };
protected void Page_Load(object sender, EventArgs e)
{
updateTree();
}
protected void updateTree()
{
treePanel.Controls.Clear();
TreeView[] treeList = new TreeView[Count];
for (int i = 0; i < Count; i++)
{
var tree = new TreeView();
tree.ID = "treelist" + i.ToString();
tree.TreeNodePopulate += TreeBranch_SelectedNodePopulate;
tree.SelectedNodeChanged += TreeBranch_SelectedNodeChanged;
string codeName = codeList[i];
TreeNode codeNode = new TreeNode(codeName, codeName);
codeNode.SelectAction = TreeNodeSelectAction.Select;
codeNode.PopulateOnDemand = true;
tree.Nodes.Add(codeNode);
tree.ExpandDepth = 2;
treePanel.Controls.Add(tree);
treeList[i] = tree;
}
}
protected void TreeBranch_SelectedNodeChanged(object sender, EventArgs e)
{
TreeView treeview = (TreeView)sender;
string text = treeview.SelectedNode.Text;
Label1.Text = text;
}
protected void TreeBranch_SelectedNodePopulate(object sender, TreeNodeEventArgs e)
{
LoadChildNode(e.Node);
}
public void LoadChildNode(TreeNode parentNode)
{
TreeNode childNode = new TreeNode("childNode","childNode");
parentNode.ChildNodes.Add(childNode);
childNode.PopulateOnDemand = true;
}
}
答案 0 :(得分:0)
请尝试以下代码。
treePanel.Controls.Clear();
TreeView[] treeList = new TreeView[codebaseCount]; //But I recommend you use List<TreeView> instead of TreeView[];
for (int i = 0; i < codebaseCount; i++)
{
var tree = new TreeView();
tree.ID = "treelist" + i.ToString();
tree.TreeNodePopulate += TreeBranch_SelectedNodePopulate;
tree.SelectedNodeChanged += TreeBranch_SelectedNodeChanged;
TreeNode newNode = new TreeNode(newName,newName);
newNode.SelectAction = TreeNodeSelectAction.None;
newNode.Expand();
tree.Nodes.Add(newNode);
tree.ExpandDepth = 2;
treePanel.Controls.Add(tree);
treeList[i] = tree;
// more code ...
}