【凤凰社原创】.NET树形结构帮助类
以下是.NET树形结构帮助类的源码,可以拿去直接用,有兴趣的可以参考一下
using System;
using System.Collections.Generic;
using System.Linq;
namespace FHCollege.Util
{
/// <summary>
/// 树结构帮助类
/// </summary>
public class TreeHelper
{
/// <summary>
/// 建造树结构
/// </summary>
/// <param name="allNodes">所有的节点</param>
/// <returns></returns>
public static List<T> BuildTree<T>(List<T> allNodes) where T:TreeModel,new()
{
List<T> resData = new List<T>();
var rootNodes = allNodes.Where(x => x.ParentId == "0" || x.ParentId.IsNullOrEmpty()).ToList();
resData = rootNodes;
resData.ForEach(aRootNode =>
{
if (HaveChildren(allNodes, aRootNode.Id))
aRootNode.Children = GetChildren(allNodes, aRootNode);
});
return resData;
}
/// <summary>
/// 获取所有子节点
/// </summary>
/// <typeparam name="T">树模型(TreeModel或继承它的模型)</typeparam>
/// <param name="nodes">所有节点列表</param>
/// <param name="parentNode">父节点Id</param>
/// <returns></returns>
private static List<object> GetChildren<T>(List<T> nodes, T parentNode) where T:TreeModel,new()
{
Type type = typeof(T);
var properties = type.GetProperties().ToList();
List<object> resData = new List<object>();
var children = nodes.Where(x => x.ParentId == parentNode.Id).ToList();
children.ForEach(aChildren =>
{
T newNode = new T();
resData.Add(newNode);
//赋值属性
properties.ForEach(aProperty =>
{
var value = aProperty.GetValue(aChildren, null);
aProperty.SetValue(newNode, value);
});
//设置深度
newNode.Level = parentNode.Level + 1;
if (HaveChildren(nodes, aChildren.Id))
newNode.Children = GetChildren(nodes, newNode);
});
return resData;
}
/// <summary>
/// 判断当前节点是否有子节点
/// </summary>
/// <typeparam name="T">树模型</typeparam>
/// <param name="nodes">所有节点</param>
/// <param name="nodeId">当前节点Id</param>
/// <returns></returns>
private static bool HaveChildren<T>(List<T> nodes,string nodeId) where T:TreeModel,new()
{
return nodes.Exists(x => x.ParentId == nodeId);
}
}
}
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