c# - 选择对象列表中的对象的属性，该对象列表也在另一个对象列表中

Question

我有下一个架构：

public class Element
{
    public uint Id { get; set; }
    public ICollection<ElementDetails> elementDetails { get; set; }
}
public class ElementDetails
{
    public string ElementTitle { get; set; }
    public string Content { get; set; }
}

其中List<Element> someList包含数百种元素。我正在尝试获取包含特定文本（我称之为“种子”）的 ElementTitle（字符串）列表。我想要完成的是预先输入。这是我的尝试：

List<Element> suggestedElements = someList.Where(s => s.elementDetails.Any(ss => ss.ElementTitle.Contains(seed))).ToList();
List<string> suggestions = suggestedElements .SelectMany(t => t.elementDetails.Select(x => x.ElementTitle)).ToList() }); // contains all ElementTitle, including those ElementTitle that don't contain the "seed"...

我怎样才能摆脱那些不包含种子的元素？

Answer 1

List<string> suggestions = someList.SelectMany(x => x.elementDetails)
                                   .Where(y => y.ElementTitle.Contains(seed))
                                   .Select(z => z.ElementTitle)
                                   .ToList();

更简单：

List<string> suggestions  = someList.SelectMany(x => x.elementDetails)
                                    .Select(y => y.ElementTitle);
                                    .Where(z => z.Contains(seed))
                                    .ToList();