I want to group by vitaminlist, but it's not working.

My Model

public class SearchModel
{
    public List<tbbesin> besinlis,c#,asp.net-mvc,linq,lambda,group-by"/>
	














    

		

        

            
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首页  > 解决方案 > 如何按列表分组 ViewModel in view

I want to group by vitaminlist, but it's not working.



My Model



public class SearchModel
{
    public List<tbbesin> besinlis












c# - 如何按列表分组 ViewModel in view

I want to group by vitaminlist, but it's not working.



My Model



public class SearchModel
{
    public List<tbbesin> besinlis





问题描述



I want to group by vitaminlist, but it's not working.



My Model



public class SearchModel
{
    public List<tbbesin> besinlist { get; set; }
    public List<tbvitamin> vitaminliste { get; set; }
    public List<tbmineral> mineralliste { get; set; }
}




My Controller



public ActionResult ara(BesinViewModel model)
{
    var listegetir = model.besinler.Split(',');

    List<tbbesin> besinliste = new List<tbbesin>();
    List<tbmineral> minerallist = new List<tbmineral>();
    List<tbvitamin> vitaminlist = new List<tbvitamin>();    
    SearchModel modelden = new SearchModel();

    foreach (var item in listegetir)
    {
        var ID = int.Parse(item);
        var besin = db.tbbesin.FirstOrDefault(x => x.besinid == ID);
        var mineral = db.tbmineral.FirstOrDefault(x => x.besinid == ID);
        var vitamin = db.tbvitamin.FirstOrDefault(x => x.besinid == ID);

        vitaminlist.Add(vitamin);
        minerallist.Add(mineral);
        besinliste.Add(besin);
    }

    modelden.besinlist = besinliste.ToList();
    modelden.mineralliste = minerallist.ToList();
    modelden.vitaminliste = vitaminlist.ToList();

    return View(modelden);
}




My View



@model WebApplication1.Models.SearchModel
@foreach (var item22 in Model.vitaminliste.
    GroupBy(x => x.vitamindetayid).
    Select(x=>x.First()).
    ToList())
{
    @item22.tbvitamindetay.vitaminad
}




I need to group by in view vitaminlist but its not working.
Why ? Can you help me what is a problem there









You do not need a recursion, just an object for keeping the reference to node and parent node.



This approach works for unsorted data as well, because it uses both relation from item to parent and from parent to item.







const
    source = [{ id: 1, title: 'title1', alias: 'alias1', parent_id: null }, { id: 2, title: 'title2', alias: 'alias2', parent_id: null }, { id: 3, title: 'title3', alias: 'alias3', parent_id: 2 }, { id: 4, title: 'title4', alias: 'alias4', parent_id: 2 }, { id: 5, title: 'title5', alias: 'alias5', parent_id: 4 }, { id: 6, title: 'title6', alias: 'alias6', parent_id: 4 }],
    tree = function (data, root) {
        var t = {};
        data.forEach(({ parent_id, ...o }) => {
            Object.assign(t[o.id] = t[o.id] || {}, o);
            t[parent_id] = t[parent_id] || {};
            t[parent_id].items = t[parent_id].items || [];
            t[parent_id].items.push(t[o.id]);
        });
        return t[root].items;
    }(source, null);

console.log(tree);


.as-console-wrapper { max-height: 100% !important; top: 0; }








标签： c#asp.net-mvclinqlambdagroup-by


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