CODEWITHSUNDEEP
c#arrayslinqcontains
Jimbo
Jimbo

Reputation: 22964

Using LINQ how can I check for an instance of a number in one array, in another array?

I have a list of MyItem objects called myItems like this:

public class MyItem{
    public int[] category_ids;
    public string name;
}

List<MyItem> myItems;

I want to filter down the list of objects with a list of selected categories so that the filtered list contains ANY of the filter category ids:

int[] filter = { 1, 5, 6, 9 };

How would I do that using LINQ in one line? (if its even possible, I cant wrap my head around it!) I imagine something along the lines of:

IEnumerable<MyItem> filtered = myItems.Where(item => item.category_ids.Contains(xxx));

Upvotes: 2

Views: 117

Answers (3)

cuongle
cuongle

Reputation: 75306

var filtered = myItems.Where(x => x.category_ids.Intersect(filter)
                                          .Any());

Upvotes: 2

Wiktor Zychla
Wiktor Zychla

Reputation: 48230

Another option than the one already presented:

var filtered = myItems.Where( item => item.category_ids.Intersect( filter ).Count() > 0 );

Upvotes: 2

Euphoric
Euphoric

Reputation: 12849

Needs one more method call:

IEnumerable<MyItem> filtered = myItems.Where(item => item.category_ids.Any(x=>filter.Contains(x));

Upvotes: 2

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