using System;
using System.Collections.Generic;
using System.Linq;
namespace Core.Util
{
/// <summary>
/// 树结构帮助类
/// </summary>
public class TreeHelper
{
#region 外部接口
/// <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
/// 注:包括自己
/// </summary>
/// <typeparam name="T">节点类型</typeparam>
/// <param name="allNodes">所有节点</param>
/// <param name="parentNode">父节点</param>
/// <param name="includeSelf">是否包括自己</param>
/// <returns></returns>
public static List<T> GetChildren<T>(List<T> allNodes, T parentNode, bool includeSelf) where T : TreeModel
{
List<T> resList = new List<T>();
if (includeSelf)
resList.Add(parentNode);
_getChildren(allNodes, parentNode, resList);
return resList;
void _getChildren(List<T> _allNodes, T _parentNode, List<T> _resNodes)
{
var children = _allNodes.Where(x => x.ParentId == _parentNode.Id).ToList();
_resNodes.AddRange(children);
children.ForEach(aChild =>
{
_getChildren(_allNodes, aChild, _resNodes);
});
}
}
#endregion
#region 私有成员
/// <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.Where(x => x.CanWrite).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);
}
#endregion
}
}
(精华)2020年6月26日 C#类库 树结构帮助类
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转载自blog.csdn.net/aa2528877987/article/details/106970347
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