根据对象c#的另一个列表搜索对象列表 [英] Search list of object based on another list of object c#

问题描述

我有这个课程:

   class Ean
   {
        public string Code{ get; set; }
   }

   class Article
   {
        public int Id { get; set; }
        public string Name { get; set; }
        public List<Ean> BarCode { get; set; }
   }


   List<Article> arts = new List<Article>();
   List<Ean> eans = new List<Ean>();

我有两个对象的列表.我需要检查列表"arts.BarCode"中是否有eans列表中的代码之一.如何使此搜索返回布尔值? 任何帮助将是巨大的！谢谢！

I have a list of two objects. I need to check if in the list "arts.BarCode" there is one of the codes in the list eans. How can I do to make this search returns a Boolean value? Any help would be great! Thanks!

像这样的东西会很完美:

something like this would be perfect:

bool hasCheese = arts.Any(a => a.Name == "Cheese");

推荐答案

好吧，您可以只使用:

bool hasCode = arts.Any(a => a.BarCode.Intersect(eans).Any());

假设您要分别对待每个Ean对象的 ，或者或您实际上已经适当地覆盖了Equals和GetHashCode.

That's assuming that either you want to treat each Ean object individually, or you've actually overridden Equals and GetHashCode appropriately.

尽管创建一个集会更有效:

It would be more efficient to create a set though:

var set = new HashSet<Ean>(eans);
bool hasCode = arts.Any(a => a.BarCode.Any(e => set.Contains(e)));

作为一种替代方法，您可以将列表展平为基本上是条形码的序列:

As an alternative approach, you could flatten your list to basically be a sequence of barcodes:

bool hasCode = arts.SelectMany(a => a.BarCode)
                   .Intersect(eans)
                   .Any();

这实际上可能是最干净的方法，因为您并不关心哪一文章具有匹配的条形码.

That's actually probably the cleanest approach, as you don't care about which article has the matching barcode.

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