实体框架通过一个查询将多个集合添加到集合中

Question

Imagine the following scenario... I have an array that contains keywords:

string[] keywords= new string[] { "someKeyword", "otherKeyword", "andAnother One"};

In my database I have a table for news articles. Each news article has a title, that is one of the keywords.

I want to get all the news articles that contain the keywords from the array with one query.

At the moment I iterate the keywords and run a query fore every item in it:

List<NewsArticle> allArticles = new List<NewsArticle>();

foreach (var key in keywords)
{
    var articles = db.NewsArticle.FindAllAsync(x => x.Title = key).Result;
    allArticles.Add(articles);
}

This works, but I am getting data with keywords.Length queries. I am trying to get the data with one query. Something like the following:

var newsArticles = db.NewsArticle.All().Where(a => keywords.Any(k => k.Equals(a.Title)));

or

var newsArticles = from a in db.NewsArticles.All()
                   join k in keywords on NewsArticle.Title equals k
                   select a;

Is it possible to get it with one query, and if so how?

• Note the above examples did not work.

Answer 1

Please use following linq:

var newsArticles = (from a in db.NewsArticles
               where keywords.Contains(a.Title)
               select a).ToList();