[英]filter linq lookup based on values
I would like to filter a linq Lookup based on its values: 我想根据其值过滤linq Lookup:
the lookup: 查找:
ILookup<int, Article> lookup
here's what I've got so far which isn't working: 这是我到目前为止所做的不起作用:
IList<int> cityIndexes = GetCityIndexesByNames(cities);
lookup = lookup
.Where(p => p.Any(x => cityIndexes.Contains((int)x.ArticleCity)))
.SelectMany(l => l)
.ToLookup(l => (int)l.ArticleParentIndex, l => l);
just to clarify: I want to get all the articles with a city index that is contained in the above city index list. 只是为了澄清:我想获得所有带有上述城市索引列表中包含的城市索引的文章。
The problem with the code you posted, is that you're getting all the articles with the same ID as any article that has a matching city index. 您发布的代码的问题在于,您获得的所有文章与具有匹配城市索引的任何文章具有相同的ID。 If you just unpack the groups first, there's no problem.
如果你先打开组,那就没问题了。
IList<int> cityIndexes = GetCityIndexesByNames(cities);
lookup = lookup
.SelectMany(g => g)
.Where(article => cityIndexes.Contains((int)article.ArticleCity)))
.ToLookup(article => (int)article.ArticleParentIndex);
Or 要么
lookup =
(
from g in lookup
from article in g
where cityIndexes.Contains((int)article.ArticleCity)))
select article
).ToLookup(article => (int)article.ArticleParentIndex);
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