ASP.NET 中的递归树视图 [英] Recursive TreeView in ASP.NET

问题描述

我有一个列表类型的对象，我希望用它来填充 asp.net c# 中的树视图.

I have an object of type list from which I wish to use to populate a treeview in asp.net c#.

每个对象项都有:

id | Name | ParentId

例如:

id | Name     | ParentId
-------------------------
1  | Alice    | 0
2  | Bob      | 1
3  | Charlie  | 1
4  | David    | 2

在上面的例子中，父母是爱丽丝，有两个孩子鲍勃和查理.大卫是鲍勃的孩子.

In the above example, the parent would be Alice having two children Bob and Charlie. David is the child of Bob.

我在尝试在 c# ASP.NET 中以递归方式动态填充树视图时遇到了很多问题

I have had many problems trying to dynamically populate the treeview recursively in c# ASP.NET

有人有简单的解决方案吗?

Does any one have a simple solution?

顺便说一句:您可以使用 People.Id、People.Name 和 People.ParentId 来访问成员，因为它是属于列表的对象.

Btw: you can use People.Id, People.Name and People.ParentId to access the members since it is an object belonging to list.

到目前为止，我可以向您发布我的代码(进行了多次尝试)，但不确定它会有多大用处.

I can post you my code so far (many attempts made) but not sure how useful it will be.

推荐答案

我认为这应该能让你开始.我创建了一个 MyObject 类来模仿您的对象.

I think this should get you started. I created a MyObject class to mimic your object .

public class MyObject
{
    public int Id;
    public int ParentId;
    public string Name;
}

这里是一种基于列表递归添加树视图节点的方法.

Here is a method to recursivley add tree view nodes based on the list.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        List<MyObject> list = new List<MyObject>();
        list.Add(new MyObject(){Id=1, Name="Alice", ParentId=0});
        list.Add(new MyObject(){Id=2, Name="Bob", ParentId=1});
        list.Add(new MyObject(){Id=3, Name="Charlie", ParentId=1});
        list.Add(new MyObject(){Id=4, Name="David", ParentId=2});            

        BindTree(list, null);            
    }
}

private void BindTree(IEnumerable<MyObject> list, TreeNode parentNode)
{
    var nodes = list.Where(x => parentNode == null ? x.ParentId == 0 : x.ParentId == int.Parse(parentNode.Value));
    foreach (var node in nodes)
    {
        TreeNode newNode = new TreeNode(node.Name, node.Id.ToString());
        if (parentNode == null)
        {
            treeView1.Nodes.Add(newNode);
        }
        else
        {
            parentNode.ChildNodes.Add(newNode);
        }
        BindTree(list, newNode);
    }
}

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