asp.net树形结构如何处理节点重命名

在ASP.NET中处理树形结构的节点重命名，可以通过以下步骤实现：

1. 创建一个树形结构类（TreeNode）：

public class TreeNode
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int? ParentId { get; set; }
    public List<TreeNode> Children { get; set; }

    public TreeNode()
    {
        Children = new List<TreeNode>();
    }
}

2. 创建一个树形结构管理类（TreeManager）：

public class TreeManager
{
    private readonly List<TreeNode> _nodes = new List<TreeNode>();

    public void AddNode(TreeNode node)
    {
        _nodes.Add(node);
    }

    public void RenameNode(int nodeId, string newName)
    {
        var node = _nodes.FirstOrDefault(n => n.Id == nodeId);
        if (node != null)
        {
            node.Name = newName;
        }
    }

    public List<TreeNode> GetNodeById(int nodeId)
    {
        return _nodes.Where(n => n.Id == nodeId).ToList();
    }

    // 其他方法，如删除节点、展开/折叠节点等
}

3. 在ASP.NET页面中使用TreeManager：

<asp:DropDownList ID="ddlParent" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlParent_SelectedIndexChanged">
</asp:DropDownList>
<asp:GridView ID="gvNodes" runat="server" AutoGenerateColumns="False" ShowHeader="false">
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:CommandField ShowEditButton="True" />
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGridView();
    }
}

private void BindGridView()
{
    var treeManager = new TreeManager();
    // 添加节点到树形结构
    treeManager.AddNode(new TreeNode { Id = 1, Name = "Node 1", ParentId = null });
    treeManager.AddNode(new TreeNode { Id = 2, Name = "Node 2", ParentId = 1 });
    treeManager.AddNode(new TreeNode { Id = 3, Name = "Node 3", ParentId = 1 });

    var selectedParentId = Convert.ToInt32(ddlParent.SelectedValue);
    var nodes = treeManager.GetNodeById(selectedParentId).Children;

    gvNodes.DataSource = nodes;
    gvNodes.DataBind();
}

protected void ddlParent_SelectedIndexChanged(object sender, EventArgs e)
{
    BindGridView();
}

4. 在GridView的RowEditing事件中处理节点重命名：

protected void gvNodes_RowEditing(object sender, GridViewEditEventArgs e)
{
    var node = treeManager.GetNodeById(Convert.ToInt32(gvNodes.DataKeys[e.NewEditIndex].Value)).FirstOrDefault();
    if (node != null)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "renameNode", $"RenameNode('{node.Id}', '{txtNewName.Text}');", true);
    }
}

[WebMethod]
public static string RenameNode(int nodeId, string newName)
{
    var treeManager = new TreeManager();
    var node = treeManager.GetNodeById(nodeId).FirstOrDefault();
    if (node != null)
    {
        node.Name = newName;
        return "success";
    }
    return "error";
}

5. 在页面加载时添加事件处理程序：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGridView();
        GridView1.RowEditing += new GridViewEditEventHandler(GridView1_RowEditing);
        GridView1.RowUpdating += new GridViewUpdateEventHandler(GridView1_RowUpdating);
        GridView1.RowCancelingEdit += new GridViewCancelEditEventHandler(GridView1_RowCancelingEdit);
    }
}

private void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
    BindGridView();
}

private void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    var node = treeManager.GetNodeById(Convert.ToInt32(gvNodes.DataKeys[e.RowIndex].Value)).FirstOrDefault();
    if (node != null)
    {
        node.Name = txtNewName.Text;
        treeManager.RenameNode(node.Id, node.Name);
        BindGridView();
    }
}

private void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    BindGridView();
}

这样，你就可以在ASP.NET中处理树形结构的节点重命名了。注意，这个示例仅用于演示目的，实际应用中可能需要根据具体需求进行调整。