从 DataTable 填充 TreeView [英] Populate TreeView from DataTable

问题描述

我在我的数据库中创建了一个帐户表，其中包含以下列:

I have created an account table in my database, with these columns:

ID
Name
ParentID

这是记录如何存储的示例:

This is an example of how records have been stored:

ID   Name    ParentID
1    BANK A  0
2    0001    1
3    0002    1
4    BANK B  0
5    0001    4
6    0002    4

但是公司名称不是来自数据库，而是来自代码.那么我怎样才能像这样扩展 TreeView 呢?

But the company name does not come from database, it comes from code. So how can I expand the TreeView like this?

├─ BANK A
│  ├─ 0001
│  └─ 0002
└─ BANK B
   ├─ 0001
   └─ 0002

我怎样才能在 C# 中做到这一点?我也从 HERE 尝试过，但我还是不明白.

How can I do this in C#? I also tried from HERE but I still don't understand it.

推荐答案

在花了 2 小时制作复杂的算法后，我找到了一段非常适合我的代码:

i have found a piece of code that worked great for me after spending 2h to make complicated algorithlms :

 //In Page load
 //select where id is null to retrieve the parent nodes 
 //in a datatable (called table here)
 foreach (DataRow row in table.Rows)
 {
   TreeNode node = new TreeNode();
   node.Text = row["title"].ToString();
   node.Value = row["id"].ToString();
   //you can affect the node.NavigateUrl

   node.PopulateOnDemand = true;
   TreeView1.Nodes.Add(node);
 }

然后创建 TreeNodePopulate 事件:

then create the TreeNodePopulate event :

 protected void TreeView1_TreeNodePopulate(Object sender, TreeNodeEventArgs e)
 {
     string id= e.Node.Value;
     //do your "select from yourTable where parentId =" + id;

     foreach (DataRow row in table.Rows)
     {
         TreeNode node = new TreeNode(row["title"], row["id"])
         node.PopulateOnDemand = true;    
         e.Node.ChildNodes.Add(node);
     }

 }

它对我来说太棒了，我希望它会有所帮助！

it worked like hell for me, i hope it will help !

这篇关于从 DataTable 填充 TreeView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！