CODEWITHSUNDEEP
c#linq
Snapper
Snapper

Reputation: 686

IEnumerable contains IEnumerable

I have two IEnumerable objects and I want to validate if one of them contains all the elements of the other.

I'm using obj1.Intersect(obj2).Any() but the intersection is not working as I'd expect. It returns true even just one of the elements in obj2 exists in obj1.

Is there any way to verify if all the elements of obj2 exist in obj1?

Upvotes: 3

Views: 1253

Answers (1)

Steven Doggart
Steven Doggart

Reputation: 43743

There is no single LINQ method which does what you need without at least specifying a lambda. There are, however, multiple ways to do it with LINQ. Here are a few options (to test if obj2 is a subset of obj1):

obj1.Intersect(obj2).Count() == obj2.Count()

or

obj2.All(x=>obj1.Contains(x))

or

obj2.Except(obj1).Any()

Upvotes: 7

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