.net core3.x递归树形解析
电脑版发表于：2020/7/17 19:17
写好树形需要的model，我这里前端的树形用的是jstree，按照他的格式来即可，
public class JsTreeViewModel
{
public int Id { get; set; }
public string text { get; set; }
public string icon { get; set; }
public List<JsTreeViewModel> children = new List<JsTreeViewModel>();
}写好递归树形解析方法，其实就是把数据库的数据解析成一个List<JsTreeViewModel>
public void ParseTree(List<MyNoteFile> departments, List<JsTreeViewModel> treeModels, int? parentId)
{
//找当前层级下级(如果parentId==null那就是第一级)
List<MyNoteFile> result = departments.Where(a => a.ParentId == parentId).OrderBy(a => a.NoteFileOrder).ToList();
foreach (MyNoteFile item in result)
{
JsTreeViewModel treeModel = new JsTreeViewModel();
treeModel.Id = item.Id;
treeModel.text = item.FileName;
treeModel.icon = item.Style;
//递归
ParseTree(departments, treeModel.children, treeModel.Id);
treeModels.Add(treeModel);
}
}
[HttpGet]
public ContentResult GetTreeData(DTO_LoginInfo loginInfo)
{
List<MyNoteFile> myNoteFiles = _myNoteFileDAL.GetMyNoteFileByUserId(loginInfo.UserId);
//递归解析数据
List<JsTreeViewModel> treeModels = new List<JsTreeViewModel>();
ParseTree(myNoteFiles, treeModels, null);
string jsonStr = JsonConvert.SerializeObject(treeModels);
return Content(jsonStr, "application/json");
}注意：.net core3.x使用的json序列化类是System.Text.Json.JsonSerializer，据说效率快一点。但是在序列化这种树形的时候有点问题，它只能序列化一级出来，所以我这里换成了Newtonsoft.Json类
然后，数据解析好了，前端调用就很简单了
代码如下:
$("#tree_3").jstree({
"core": {
"themes": {
"responsive": false
},
// 允许回调
"check_callback": true,
'data': {
'url': function (node) {
return '/mynote/GetTreeData';
}
}
},
"types": {
"default": {
"icon": "fa fa-folder icon-state-warning icon-lg"
},
"file": {
"icon": "fa fa-file icon-state-warning icon-lg"
}
},
"state": { "key": "demo2" },
"plugins": ["contextmenu", "dnd", "state", "types"],
});效果如下：
可以换换数据库看看效果：
嘿嘿，饭做好了吃饭!
