在ASP.NET TreeView控件递归 [英] Recursive TreeView in ASP.NET

问题描述

我有类型列表中的对象从中我希望用来填充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#.

每个对象的项目有：

id | Name | ParentId

因此​​，例如：

so for example:

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

在上面的例子中，亲本会具有两个孩子鲍勃和Charlie爱丽丝。大卫是Bob的孩子。

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

我有很多问题想递归动态填充树视图在C＃ASP.NET

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

没有任何一个有一个简单的解决方案？

Does any one have a simple solution?

顺便说一句：你可以使用People.Id，People.Name和People.ParentId访问成员，因为它是属于列出对象

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

我至今（许多尝试做），但不知道它会多么有用张贴你我的code。

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

推荐答案

我想这应该让你开始。我创建了一个为MyObject 类模仿你的对象。

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;
}

下面是recursivley添加基于列表中的树视图节点的方法。

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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