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I have an object model MyObject that contains a list of long called ObjectList. I have another list called TestList that also contains longs and I want to determine if TheObject.ObjectList contains any elements that are in TestList.

I'm trying with something like this but it's not giving Count as an option.

if (TheObject.ObjectList.Any(TestList).Count() > 0) {...}

How should I rewrite this? Thanks for your suggestions.

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2 Answers 2

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5

Use Intersect:

TheObject.ObjectList.Intersect(TestList).Any()

Produces the set intersection of two sequences by using the default equality comparer to compare values.

Note: There are also Except and Union set opeartions.

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 if ( TheObject.ObjectList.Intersect(TestList).Any() ) { ... }
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