C# 菜单之递归算法

今天因为菜单的问题, 需要用到递归算法, 在此记录一下:

1.表结构如下:(这里只是展示两个比较重要的字段) ,大家应该都看明白

2.先定义一个菜单结构类.

3.实现递归.

 private List<TreeChildViewModel>  AddChildN(string Pid)
        {
            var data = _perssionRepsonsityService.GetAllList().Where(x => x.ParentID == Pid);//这里是获取数据
            List<TreeChildViewModel> list = new List<TreeChildViewModel>();
            foreach (var item in data)
            { 
　　　　　　　　　　//这一块主要是转换成TreeChidViewModel的值.
                TreeChildViewModel childViewModel = new TreeChildViewModel();
                childViewModel.id = item.ID;
                childViewModel.component = item.Component;
                childViewModel.name = item.Name;
                childViewModel.meta_icon = item.Meta_icon;
                childViewModel.meta_title = item.Meta_title;
                childViewModel.meta_content = item.Meta_content; 
                childViewModel.treeChildren = GetChildList(childViewModel);
                list.Add(childViewModel);
            } 
            return list;
        }

        public List<TreeChildViewModel> GetChildList(TreeChildViewModel treeChildView)
        {
            if (!_perssionRepsonsityService.IsExists(x => x.ParentID == treeChildView.id))
            {
                return null;
            }
            else
            {
              return   AddChildN(treeChildView.id);
            }
        }

4.调用

public string  Client()
{
   List<TreeChildViewModel> treeViewModels = new List<TreeChildViewModel>();

   treeViewModels= AddChildN("0");  
　　return  JsonConvert.SerializeObject(treeViewModels);　
}

5.结果展示

[
    {
        "id":"1",
        "pathRouter":null,
        "name":"用户管理",
        "component":"123123",
        "meta_title":null,
        "meta_content":null,
        "meta_icon":null,
        "treeChildren":[
            {
                "id":"2",
                "pathRouter":null,
                "name":"table",
                "component":"123123",
                "meta_title":null,
                "meta_content":null,
                "meta_icon":null,
                "treeChildren":[
                    {
                        "id":"5",
                        "pathRouter":null,
                        "name":"table",
                        "component":"123123",
                        "meta_title":null,
                        "meta_content":null,
                        "meta_icon":null,
                        "treeChildren":null
                    }
                ]
            }
        ]
    },
    {
        "id":"3",
        "pathRouter":null,
        "name":"table",
        "component":"123123",
        "meta_title":null,
        "meta_content":null,
        "meta_icon":null,
        "treeChildren":[
            {
                "id":"4",
                "pathRouter":null,
                "name":"table",
                "component":"123123",
                "meta_title":null,
                "meta_content":null,
                "meta_icon":null,
                "treeChildren":null
            }
        ]
    },
    {
        "id":"6",
        "pathRouter":null,
        "name":"table",
        "component":"123123",
        "meta_title":null,
        "meta_content":null,
        "meta_icon":null,
        "treeChildren":null
    }
]

6.这里是全部菜单获取的, 如果是根据角色来判断权限获取的话, 在AddChildN 的foreach 里面进行权限进行过滤, 如果该角色ID下的权限包含有相应的权限ID,则执行,否则,直接跳出循环. ,但是这最终还得根据实际表结构来进行过滤. 

7.总结, 其实我这差不多是误打误撞写出来的,算做个记录吧.. 

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