CODEWITHSUNDEEP
c#
frenchie
frenchie

Reputation: 51937

Determine if a List contains elements from another List

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.

Upvotes: 2

Views: 700

Answers (2)

Oded
Oded

Reputation: 499002

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.

Upvotes: 5

Henk Holterman
Henk Holterman

Reputation: 273244

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

Upvotes: 3

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