C# 构造tree菜单工具方法
如何构造tree数据结构,做个笔记,方便查阅,本方法是直接返回json字符串:
private string ToMenuJson(List<Model> data, string parentId) { var sbJson = new StringBuilder(); sbJson.Append("["); var entitys = data.FindAll(t => t.ParentID == parentId).ToList(); if (entitys.Count > 0) { foreach (var item in entitys) { var strJson = JsonConvert.SerializeObject(item, new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore }); strJson = strJson.Insert(strJson.Length - 1, ",\"ChildNodes\":" + ToMenuJson(data, item.ID) + ""); sbJson.Append(strJson + ","); } sbJson = sbJson.Remove(sbJson.Length - 1, 1); } sbJson.Append("]"); return sbJson.ToString(); }
本方法是构造tree实体,返回实体:
/// <summary> /// 绑定列表递归方法 /// </summary> /// <param name="ddl">构造tree数据结构返回的实体</param> /// <param name="menus">绑定的数据源</param> /// <param name="categoryid">父级id值</param> private void BindChannelType(List<ECategoryModel> ddl, List<ECategory> menus, Guid categoryid) { List<ECategory> filterMenu = menus.Where(w => w.ParentID == categoryid).ToList(); foreach (var m in filterMenu) { var mextend = new ECategoryModel { ID = m.ID, ParentID = m.ParentID, CategoryName = m.CategoryName, URL = m.URL, Sort = m.Sort, IsDelete = m.IsDelete }; ddl.Add(mextend); BindChannelType(mextend.children, menus, m.ID); } }
构造树形数据(带空格和缩进):
/// <summary>
/// 构造树形下拉框数据结构
/// </summary>
private void Generate(List<ECategoryModel> viewList, List<ECategory> categories, Guid categoryid, int i = 0)
{
i++;
var filterMenu = categories.Where(w => w.ParentID == categoryid).OrderBy(w => w.Sort).ToList();
foreach (var m in filterMenu)
{
var str = "";
//父级菜单不缩进
for (var j = 1; j < i; j++)
{
str += HttpUtility.HtmlDecode(" ") + "├";
}
var mextend = new ECategoryModel
{
ID = m.ID,
ParentID = m.ParentID,
CategoryName = $"{str}{m.CategoryName}",
URL = m.URL,
iconSkin = m.URL,
Sort = m.Sort,
IsDelete = m.IsDelete
};
viewList.Add(mextend);
Generate(viewList, categories, m.ID, i);
}
}
相关的实体类 ECategoryModel.cs:
using System; using System.Collections.Generic; namespace MSEduPlatform.Models { /// <summary> /// ECategory表实体类 /// </summary> public class ECategoryModel { /// <summary> /// 菜单ID /// </summary> public Guid ID { get; set; } /// <summary> /// 父级菜单ID /// </summary> public Guid ParentID { get; set; } /// <summary> /// 菜单Code /// </summary> public string Code { get; set; } /// <summary> /// 菜单名称 /// </summary> public string CategoryName { get; set; } /// <summary> /// 菜单地址 /// </summary> public string URL { get; set; } /// <summary> /// 菜单排序 /// </summary> public int Sort { get; set; } /// <summary> /// 显示状态 /// </summary> public int States { get; set; } /// <summary> /// 栏目权限类别 /// </summary> public string AuthorizationType { get; set; } /// <summary> /// 是否授权 /// </summary> public bool IsAuthorization { get; set; } /// <summary> /// 创建人 /// </summary> public Guid Creater { get; set; } /// <summary> /// 创建时间 /// </summary> public DateTime CreateTime { get; set; } /// <summary> /// 修改人 /// </summary> public Guid Modify { get; set; } /// <summary> /// 修改时间 /// </summary> public DateTime ModifyTime { get; set; } /// <summary> /// 是否逻辑删除 /// </summary> public int IsDelete { get; set; } /// <summary> /// 子数据列表 /// </summary> public List<ECategoryModel> children = new List<ECategoryModel>(); } }
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2017-10-19 CLR 协变、逆变