C#Linq查询:从列表中获取键在其他列表中的所有项目 [英] C# Linq query: Get all items from list which key is in other list
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问题描述
我有两个列表集合.一个带有键,另一个带有记录.
I have two list collections. One with keys and one with records.
class Record
{
int key;
string Data;
}
List<int> Keys = new List<int>{1,2,3};
List<record> records = [SOME_RECORDS]
</record></int></int>
如何从记录"列表中获取所有项,其中键"列表中的键属性是什么?
How to get all items from Records list which key property is in Keys list?
Could it be one line linq expression?
推荐答案
使用您的代码,我会这样做:
Using your code, I''d do it like this:
var results = records.Where(r => Keys.Contains(r.key));
或者您也可以通过联接来执行此操作,以防添加更多条件,例如:
Or you can also do this with a join in case you want to add more conditions etc:
var query = from record in records
join key in Keys on record.key equals key
select record;
如果同一条记录可以有多个键,则可以使用Distinct操作
In case you can have multiple keys for the same record, you can use the Distinct operation
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