Linq Query Condition for multiple row - database

Question

I tried to solve one query from last 2 days but didn't.
It looks easy to understand but can't made.
There are two column in Table for example:
ResourceId || MappingId
1 2
1 3
2 2
2 4
3 2
3 4
4 2
4 5
5 2
5 4
This is one table which have two fields ResourceId and MappingId.
Now I want resourceId which have Mappingid {2,4}
Means answer must be ResourceId {2,3,5}
How can I get this answer in Linq Query?

Answer 1

Use Contains of collection. This method can be translated by Entity Framework into SQL IN operator:
int[] mappingIds = { 2, 4 };
var resources = from t in table
where mappingIds.Contains(t.MappingId)
select t.ResourceId;
Lambda syntax:
var resources = table.Where(t => mappingIds.Contains(t.MappingId))
.Select(t => t.ResourceId);
Generated SQL will look like:
SELECT [Extent1].[ResourceId]
FROM [dbo].[TableName] AS [Extent1]
WHERE [Extent1].[MappingId] IN (2,4)
UPDATE: If you want to get resources which have ALL provided mapping ids, then
var resources = from t in table
group t by t.ResourceId into g
where mappingIds.All(id => g.Any(t => t.Id == id))
select g.Key;
Entity Framework is able to translate this query into SQL, but it will not be that beautiful as query above.

Answer 2

IQueryable<int> resourceIds = table
// groups items by ResourceId
.GroupBy(item => item.ResourceId)
// consider only group where: an item has 2 as MappingId value
.Where(group => group.Select(item => item.MappingId).Contains(2))
// AND where: an item has 4 as MappingId value
.Where(group => group.Select(item => item.MappingId).Contains(4))
// select Key (= ResourceId) of filtered groups
.Select(group => group.Key);