Linq-to-SQL反向包含 [英] Linq-to-SQL reverse contains

问题描述

如何在Linq-to-SQL查询中反转包含内容，以便我可以检查Title或Description是否包含列表中的任何单词，例如:

How would I reverse contains in a Linq-to-SQL query so that I can check if Title or Description contain any word from my list, something like:

var query = context.Shapes.Where(x => x.Title.Contains(words));

这是我现在拥有的东西，但这与我所需要的相反.

Here is what I have now but that is opposite from what I need.

 List<string> words = Search.GetTags(q);
 //words = round,circle,square

 using(ShapesDataContext context = new ShapesDataContext())
 {
    var query = context.Shapes.Where(x => words.Contains(x.Title) || 

    words.Contains(x.Description));
 }

// Item 1: Title = Elipse , Decsription = This is not round circle
//This should be a match! but words doesn't contain 
//"This is not round circle", only round and circle so no match

更新

现在我有

  var query = context.Shapes.Where(x => words.Any(w => x.Title.Contains(w) || x.Description.Contains(w)))
  int s = query.Count();

但是现在我在int s = query.Count();上遇到了异常，消息为不能在包含包含运算符的查询运算符的LINQ to SQL实现中使用本地序列".有人知道如何解决吗?

but now I get exception on int s = query.Count(); with message "Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator." Does anyone know how to solve it?

推荐答案

不是最有效的方法，但我设法做到了:

Not the most efficient but I managed:

 List<string> words = Search.GetTags(q);
 using(ShapesDataContext context = new ShapesDataContext())
 {
   IQueryable<Shape> query = Enumerable.Empty<Shape>().AsQueryable();
   foreach (var word in words)
   {
     query = query.Union(context.Shapes.Where(x => x.Title.Contains(word) || x.Description.Contains(word)));
   }

这篇关于Linq-to-SQL反向包含的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！