数据库对象的Treeview C＃ [英] Treeview for database objects C#

问题描述

大家好，



如何用来自gridview或dt的数据填充树形视图，



数据表有4列：



1-家长ID

2-家长姓名

3-子女ID

4-孩子的名字



我的尝试：



我发现几乎所有静态树的例子都是硬编码的，所以这在我的场景中不会被充分使用

Hello everyone,

How to fill Tree view with data from gridview or dt,

Data table has 4 columns:

1- Parent ID
2- Parent Name
3- Child ID
4- Child Name

What I have tried:

Almost all of the examples that i found where static trees, hard coded so this won't be use full in my scenario

推荐答案

这是快速回答论坛的相当高的订单。

如果你付了足够的钱，我很乐意为你编写代码。 :)



我假设您将数据库中的数据导入一个或多个数据表。

首先，您可以看看这些文章：

从C＃中的数据表创建Treeview | C＃中的动态Treeview控件C＃中的Treeview节点|如何在C＃中将节点绑定到运行时的Treeview控件作者代码| AuthorCode [ ^ ]



[更新]

似乎是上述链接部分代码中的错误。

您将收到编译器错误并非所有代码路径都返回值。

请参阅下面的修复。

This is a pretty tall order for the Quick Answer forum.
If you paid enough I would happily write the code for you. :)

I assume you get the data from the database into one or more data tables.
As a start you can look at these articles:
Create Treeview From Datatable In C#| Dynamic Treeview Control In C# | Treeview Nodes In C# |How To Bind Nodes To Treeview Control At Runtime In C# | Author Code | AuthorCode[^]

[UPDATE]
Seems to be a bug in part of the code from the link above.
You will get the compiler error "Not all code paths return a value."
See the fix below.

private TreeNode Searchnode(string nodetext, TreeView trv)
{
    foreach (TreeNode node in trv.Nodes) 
    {
        if (node.Text == nodetext) 
        {
            return node;
        }
    }

    // Added the line below, so the method returns null if no node was found
    return null; 
}

那么你必须要注意方法可以返回null的情况。

< br $> b $ b

填充TreeView控件C＃ [ ^ ]



至于阻力&请看这里：在C＃中拖动树节点 [ ^ ]



这些文章应该让你入门。

Then you have to take care of the case that the method can return null.


Populate a TreeView Control C#[^]

As for drag & drop, look here: Dragging tree nodes in C#[^]

These articles should get you started.

这篇关于数据库对象的Treeview C＃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！