Find if listA contains any elements not in listB

Question

I have two lists   List lt int gt  listA      List lt int gt  listB   How to check using LINQ if in the listA exists an element wchich deosn t exists in the listB   I can use the foreach loop but I m wondering if I can do this using LINQ

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This piece of code compares two lists both containing a field for a CultureCode like 'en-GB'. This will leave non existing translations in the list. (we needed a dropdown list for not-translated languages for articles)

var compared = supportedLanguages.Where(sl => !existingTranslations.Any(fmt => fmt.CultureCode == sl.Culture)).ToList();

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List has Contains method that return bool  We can use that method in query   List lt int gt  listA   new List lt int gt     List lt int gt  listB   new List lt int gt     listA AddRange new int     1 2 3 4 5     listB AddRange new int     3 5 6 7 8      var v   from x in listA         where  listB Contains x          select x   foreach  int i in v      Console WriteLine i

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Get the difference of two lists using Any    The Linq Any   function returns a boolean if a condition is met but you can use it to return the difference of two lists   var difference   ListA Where a   gt   ListB Any b   gt  b ListItem    a ListItem   ToList

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listA Except listB  will give you all of the items in listA that are not in listB

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You can do it in a single line  var res   listA Where n   gt   listB Contains n      This is not the fastest way to do it  in case listB is relatively long  this should be faster   var setB   new HashSet listB   var res   listA Where n   gt   setB Contains n

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listA Any     gt  listB Contains

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if  listA Except listB  Any

[c#] Find if listA contains any elements not in listB

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