使用 Lambda 绑定嵌套列表 (C#)

Question

我有一段代码正在尝试转换为 lambda -

 foreach (var facet in response.Result.Facets)
            {
                var newFacet = new Facet {Parent = facet.Title};

                foreach (var element in facet.Subelements)
                {
                    newFacet.Items.Add(new Facet
                                           {
                                               Title = element.Title,
                                               TotalResults = element.TotalResults
                                           });
                }

                searchModel.Facets.Add(newFacet);
            }

这是我到目前为止所拥有的代码 -

response.Result.Facets.ForEach(x => searchModel.Facets.Add(new Facet
                                                                               {
                                                                                   Parent = x.Title,
                                                                                   Items = ???//x.Subelements.ForEach(y=>)
                                                                               }));

以及类 -

public class Facet
{
    public Facet()
    {
        Items = new List<Facet>();
    }

    public string Parent { get; set; }
    public List<Facet> Items { get; set; }
    public int TotalResults { get; set; }
    public string Title { get; set; }
}



    public class SearchElement
    {
        public string Parent { get; set; }
        public string Title { get; set; }
        public int TotalResults { get; set; }
        public IList<ESearchElement> Subelements { get; set; }
    }

如何将 List 绑定到 List 通过将每个元素 (title = y.Title..) 映射到 lambda 表达式中的一行中？是否可以？

Answer 1

尝试这样的操作：

searchModel.Facets.AddRange(
    from facet in response.Result.Facets
    select new Facet
    {
        Parent = facet.Title,
        Items = new List<Facet>(
            from element in facet.Subelements
            select new Facet
            {
                Title = element.Title,
                TotalResults = element.TotalResults
            }),
    });

---

编辑：评论中每个请求的 Lambda 版本。

searchModel.Facets.AddRange(
    response.Result.Facets.Select(
        facet => new Facet
        {
            Parent = facet.Title,
            Items = new List<Facet>(
                facet.Subelements.Select(
                    element => new Facet
                    {
                        Title = element.Title,
                        TotalResults = element.TotalResults
                    })),
        }));

与 LINQ 非常相似。这就是你所追求的吗？