TreeUtil.cs
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using NCC.Common.Extension;
using NCC.Dependency;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
namespace NCC.Common.Util
{
/// <summary>
/// 树结构帮助类
/// </summary>
[SuppressSniffer]
public static class TreeUtil
{
/// <summary>
/// 建造树结构
/// </summary>
/// <param name="allNodes">所有的节点</param>
/// <param name="parentId">节点</param>
/// <returns></returns>
public static List<T> ToTree<T>(this List<T> allNodes, string parentId = "0") where T : TreeModel, new()
{
List<T> resData = new List<T>();
var rootNodes = allNodes.Where(x => x.parentId == parentId || x.parentId.IsNullOrEmpty()).ToList();
resData = rootNodes;
resData.ForEach(aRootNode =>
{
aRootNode.hasChildren = HaveChildren(allNodes, aRootNode.id);
if (aRootNode.hasChildren)
{
aRootNode.children = _GetChildren(allNodes, aRootNode);
aRootNode.num = aRootNode.children.Count();
}
else
{
aRootNode.isLeaf = !aRootNode.hasChildren;
aRootNode.children = null;
}
});
return resData;
}
/// <summary>
/// 建造树结构
/// </summary>
/// <param name="allNodes">所有的节点</param>
/// <param name="parentId">节点</param>
/// <returns></returns>
public static List<T> ToTreeFilterParent<T>(this List<T> allNodes, string parentId = "0") where T : TreeModel, new()
{
List<T> resData = new List<T>();
var rootNodes = allNodes.Where(x => x.parentId == parentId).ToList();
resData = rootNodes;
resData.ForEach(aRootNode =>
{
aRootNode.hasChildren = HaveChildren(allNodes, aRootNode.id);
if (aRootNode.hasChildren)
{
aRootNode.children = _GetChildren(allNodes, aRootNode);
aRootNode.num = aRootNode.children.Count();
}
else
{
aRootNode.isLeaf = !aRootNode.hasChildren;
aRootNode.children = null;
}
});
return resData;
}
#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
foreach (var aProperty in properties.Where(x => x.CanWrite))
{
var value = aProperty.GetValue(aChildren, null);
aProperty.SetValue(newNode, value);
}
newNode.hasChildren = HaveChildren(nodes, aChildren.id);
if (newNode.hasChildren)
{
newNode.children = _GetChildren(nodes, newNode);
}
else
{
newNode.isLeaf = !newNode.hasChildren;
newNode.children = null;
}
});
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);
}
///// <summary>
///// 递归重新解析成list
///// </summary>
///// <param name="allNodes"></param>
///// <param name="parentId"></param>
///// <returns></returns>
//public static List<TreeModel> DeTree(this List<TreeModel> allNodes, string parentId = "0")
//{
// List<TreeModel> list = new List<TreeModel>();
// foreach (var item in allNodes.Where(o => o.parentId == parentId))
// {
// list.Add(item);
// if (item.hasChildren)
// {
// var childrens = DeTree(allNodes, item.id);
// if (childrens != null) list.AddRange(childrens);
// item.hasChildren = false;
// item.children = new List<object>();
// }
// }
// return list;
//}
#endregion
}
/// <summary>
/// 树模型基类
/// </summary>
public class TreeModel
{
/// <summary>
/// 获取节点id
/// </summary>
/// <returns></returns>
public string id { get; set; }
/// <summary>
/// 获取节点父id
/// </summary>
/// <returns></returns>
//[JsonIgnore]
public string parentId { get; set; }
/// <summary>
/// 是否有子级
/// </summary>
public bool hasChildren { get; set; }
/// <summary>
/// 设置Children
/// </summary>
/// <param name="children"></param>
public List<object> children { get; set; } = new List<object>();
/// <summary>
/// 子节点数量
/// </summary>
public int num { get; set; }
/// <summary>
/// 是否为子节点
/// </summary>
public bool isLeaf { get; set; } = false;
}
}