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.结果并没有像我预期的那样回到目前为止看到SQL我可以看到问题.

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

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 '~'))

我希望有人可以帮助我,因为我花了几个小时来寻找解决方案.

提前致谢

Answer 1

正如您所猜测的，这是您需要更改的问题部分，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));  
}

我认为你可以通过将其更改为：

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