c# - 为动态关键字构建动态 where 子句或使用 IQueryable C# Linq

Question

我正在尝试使用 LINQ 编写动态 where 子句，以返回包含字符串数组中提供的任何关键字的所有行。到目前为止，结果并没有像我预期的那样返回，查看 SQL 我可以看到问题所在。

IQueryable<comments> query = _db.comments;

if (score != null)
    query = query.Where(x => x.score == score);
if (dateFrom != null)3
    query = query.Where(x => x.date_created >= dateFrom);
if (dateTo != null)
    query = query.Where(x => x.date_created <= dateTo);
if (keywords != null)
{
    //how to use OR for each in array?
    foreach (var keyword in keywords)
    {
        var keywordCondition = keyword;
        query = query.Where(x => x.text.Contains(keywordCondition));  
    }

}

WHERE ([Extent1].[score] = @p__linq__0) 
AND ([Extent1].[date_created] >= @p__linq__1) 
AND ([Extent1].[date_created] <= @p__linq__2) 
AND ([Extent1].[text] LIKE @p__linq__3 ESCAPE '~') 
AND ([Extent1].[text] LIKE @p__linq__4 ESCAPE '~')

--应该是

WHERE ([Extent1].[score] = @p__linq__0) 
AND ([Extent1].[date_created] >= @p__linq__1) 
AND ([Extent1].[date_created] <= @p__linq__2) 
AND (([Extent1].[text] LIKE @p__linq__3 ESCAPE '~') 
    OR ([Extent1].[text] LIKE @p__linq__4 ESCAPE '~'))

我已经花了几个小时寻找解决方案，希望有人能帮助我。

提前致谢

Answer 1

正如您所猜到的，这是您需要更改的有问题的部分，因为它将“AND”所有子句。

//how to use OR for each in array?
foreach (var keyword in keywords)
{
    var keywordCondition = keyword;
    query = query.Where(x => x.text.Contains(keywordCondition));  
}

我认为您可以通过将其更改为:

query = query.Where(x => keywords.Any(kw => x.text.Contains(kw));