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TreeHelper.cs
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TreeHelper.cs
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/*
* 树形数据生成。
* 联系:QQ 100101392
* 来源:https://github.com/snipen/Helper.Core.Library
* */
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace Helper.Core.Library
{
public class TreeHelper
{
#region 私有属性常量
private const string TreeUniqueIdentityFormat = "1{0}{1}";
#endregion
#region 对外公开方法
/// <summary>
/// 生成树形 JSON 数据
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="maxLength">最大编号长度,为 0 程序自动生成</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="jsonTemplate">Json 模板,例:{ id:1, name:"name" }</param>
/// <returns></returns>
public static string ToJson<T>(List<T> dataList, int maxLength = 0, string rootID = "0", ITreeJsonTemplate<T> jsonTemplate = null) where T : ITreeData
{
if (dataList == null || dataList.Count == 0) return "{}";
List<TreeNode<T>> nodeList = ToTree<T>(dataList, maxLength, rootID, jsonTemplate);
if (nodeList == null || nodeList.Count == 0) return "{}";
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("[");
int index = 0;
foreach(TreeNode<T> nodeItem in nodeList)
{
stringBuilder.Append(nodeItem.JsonText);
if (index < nodeList.Count - 1) stringBuilder.Append(",");
index++;
}
stringBuilder.Append("]");
return stringBuilder.ToString();
}
/// <summary>
/// 获取下拉列表树形数据(以 / 符号分隔)
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="layerIndex">层次索引</param>
/// <param name="layerName">层次名称,会以 / 符号连接各节点名称</param>
/// <param name="layerID">层次编号,会以 , 符号连接各节点名称</param>
/// <param name="desc">是否倒序</param>
/// <param name="layerNameSplitChar">分隔符,例:/</param>
/// <param name="layerIDSplitChar">分隔符,例:/</param>
/// <returns></returns>
public static List<T> ToMenuList<T>(List<T> dataList, string rootID = "0", int layerIndex = 1, string layerName = "", string layerID = "", bool desc = true, string layerNameSplitChar = "/", string layerIDSplitChar = ",") where T : ITreeMenu
{
List<T> resultList = new List<T>();
var query = dataList.Where(p => p.TreeParentID == rootID);
if (!desc)
{
query = query.OrderBy(p => p.TreeSort);
}
else
{
query = query.OrderByDescending(p => p.TreeSort);
}
List<T> trunkList = query.ToList();
if (trunkList != null && trunkList.Count > 0)
{
foreach (T trunkItem in trunkList)
{
trunkItem.LayerIndex = layerIndex;
if (layerIndex == 1)
{
trunkItem.LayerName = trunkItem.TreeName;
trunkItem.LayerID = trunkItem.TreeID.ToString();
}
else
{
trunkItem.LayerName = string.Format("{0}{2}{1}", layerName, trunkItem.TreeName, layerNameSplitChar);
trunkItem.LayerID = string.Format("{0}{2}{1}", layerID, trunkItem.TreeID, layerIDSplitChar);
}
resultList.Add(trunkItem);
List<T> nodeList = ToMenuList<T>(dataList, trunkItem.TreeID, layerIndex + 1, trunkItem.LayerName, trunkItem.LayerID, desc, layerNameSplitChar, layerIDSplitChar);
if (nodeList != null && nodeList.Count > 0)
{
resultList.AddRange(nodeList);
}
}
}
return resultList;
}
/// <summary>
/// 获取树形数据(按顺序)
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="maxLength">最大编号长度,为 0 程序自动生成</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="layerNameSplitChar">分隔符,例:/</param>
/// <param name="layerIDSplitChar">分隔符,例:/</param>
/// <returns></returns>
public static List<TreeNode<T>> ToList<T>(List<T> dataList, int maxLength = 0, int rootID = 0, string layerNameSplitChar = "/", string layerIDSplitChar = ",") where T : ITreeData
{
List<TreeNode<T>> nodeList = TreeHelper.ToTree<T>(dataList, maxLength, rootID.ToString(), null, layerNameSplitChar, layerIDSplitChar);
return ToNodeList<T>(nodeList);
}
/// <summary>
/// 获取树形数据
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="maxLength">最大编号长度,大于 0 程序自动生成</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="jsonTemplate">模板</param>
/// <param name="layerNameSplitChar">分隔符,例:/</param>
/// <param name="layerIDSplitChar">分隔符,例:/</param>
/// <returns></returns>
public static List<TreeNode<T>> ToTree<T>(List<T> dataList, int maxLength = 0, string rootID = "0", ITreeJsonTemplate<T> jsonTemplate = null, string layerNameSplitChar = "/", string layerIDSplitChar = ",") where T : ITreeData
{
#region 设置排序序号
if (maxLength > 0)
{
foreach (T t in dataList)
{
t.TreeUniqueIdentity = long.Parse(string.Format(TreeUniqueIdentityFormat, t.TreeParentID.PadLeft(maxLength, '0'), t.TreeID.PadLeft(maxLength, '0')));
}
}
#endregion
#region 根据排序序号排序
dataList.Sort((x, y) =>
{
return (int)(x.TreeUniqueIdentity - y.TreeUniqueIdentity);
});
#endregion
TreeNode<T> treeNode = null;
List<TreeNode<T>> nodeList = new List<TreeNode<T>>();
Dictionary<string, TreeNode<T>> nodeDict = new Dictionary<string, TreeNode<T>>();
foreach (T t in dataList)
{
// 设置根数据
if (t.TreeParentID == rootID)
{
treeNode = new TreeNode<T>() { Data = t, NodeList = new List<TreeNode<T>>(), LayerIndex = 1, IJsonTemplate = jsonTemplate, LayerID = t.TreeID, LayerName = t.TreeName };
nodeList.Add(treeNode);
nodeDict.Add(t.TreeID, treeNode);
}
else
{
if (nodeDict.ContainsKey(t.TreeParentID))
{
treeNode = new TreeNode<T>() { Data = t, NodeList = new List<TreeNode<T>>(), LayerIndex = nodeDict[t.TreeParentID].LayerIndex + 1, IJsonTemplate = jsonTemplate, LayerID = string.Format("{0}{1}{2}", nodeDict[t.TreeParentID].LayerID, layerIDSplitChar, t.TreeID), LayerName = string.Format("{0}{1}{2}", nodeDict[t.TreeParentID].LayerName, layerNameSplitChar, t.TreeName) };
treeNode.ParentNode = nodeDict[t.TreeParentID];
treeNode.ParentNode.NodeList.Add(treeNode);
nodeDict.Add(t.TreeID, treeNode);
}
}
}
return nodeList;
}
#endregion
#region 逻辑处理私有方法
private static List<TreeNode<T>> ToNodeList<T>(List<TreeNode<T>> nodeList, List<TreeNode<T>> resultList = null)
{
if (resultList == null)
{
resultList = new List<TreeNode<T>>();
}
foreach (TreeNode<T> nodeItem in nodeList)
{
resultList.Add(nodeItem);
ToNodeList<T>(nodeItem.NodeList, resultList);
}
return resultList;
}
#endregion
}
#region 逻辑处理辅助类
public class TreeNode<T>
{
/// <summary>
/// 节点层级索引
/// </summary>
public int LayerIndex { get; set; }
/// <summary>
/// 父节点
/// </summary>
public TreeNode<T> ParentNode { get; set; }
/// <summary>
/// 节点列表
/// </summary>
public List<TreeNode<T>> NodeList { get; set; }
/// <summary>
/// 从根节点开始,累积节点名称
/// </summary>
public string LayerName { get; set; }
/// <summary>
/// 从根节点开始,累积节点 ID
/// </summary>
public string LayerID { get; set; }
/// <summary>
/// 节点数据
/// </summary>
public T Data { get; set; }
public ITreeJsonTemplate<T> IJsonTemplate { get; set; }
/// <summary>
/// Json 数据
/// </summary>
public string JsonText
{
get
{
if (this.IJsonTemplate == null) return "{}";
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("{");
stringBuilder.Append(this.IJsonTemplate.Format(this));
if(this.NodeList != null && this.NodeList.Count > 0)
{
stringBuilder.Append(", \\\"dataList\\\":[");
}
int index = 0;
foreach (TreeNode<T> t in this.NodeList)
{
stringBuilder.Append(t.JsonText);
if (index < this.NodeList.Count - 1) stringBuilder.Append(",");
index++;
}
if(this.NodeList != null && this.NodeList.Count > 0)
{
stringBuilder.Append("]");
}
stringBuilder.Append("}");
return stringBuilder.ToString();
}
}
}
#endregion
#region 逻辑处理辅助接口
public interface ITreeData
{
/// <summary>
/// 树 ID
/// </summary>
string TreeID { get; }
/// <summary>
/// 树父 ID
/// </summary>
string TreeParentID { get; }
/// <summary>
/// 节点名称
/// </summary>
string TreeName { get; }
/// <summary>
/// 树排序标识,通过是 父 ID + 树 ID 组合
/// </summary>
long TreeUniqueIdentity { get; set; }
}
public interface ITreeJsonTemplate<T>
{
string Format(TreeNode<T> t);
}
public interface ITreeMenu
{
string TreeParentID { get; set; }
string TreeID { get; set; }
string TreeName { get; set; }
int LayerIndex { get; set; }
string LayerName { get; set; }
string LayerID { get; set; }
int TreeSort { get; set; }
}
#endregion
}