Intersection of multiple lists with IEnumerable.Intersect()

by

How about:

var intersection = listOfLists
    .Skip(1)
    .Aggregate(
        new HashSet<T>(listOfLists.First()),
        (h, e) => { h.IntersectWith(e); return h; }
    );

That way it’s optimized by using the same HashSet throughout and still in a single statement. Just make sure that the listOfLists always contains at least one list.

More Related Contents:

  1. C# custom add in a List
  2. Group By Multiple Columns
  3. LINQ query on a DataTable
  4. Distinct not working with LINQ to Objects
  5. When to use Cast() and Oftype() in Linq
  6. Split a collection into `n` parts with LINQ? [duplicate]
  7. Order of LINQ extension methods does not affect performance?
  8. Query an XDocument for elements by name at any depth
  9. What is the point of Lookup?
  10. Am I misunderstanding LINQ to SQL .AsEnumerable()?
  11. Extension methods syntax vs query syntax
  12. Conversion from List to array T[]
  13. Enumerating through an object’s properties (string) in C#
  14. Is the Linq Count() faster or slower than List.Count or Array.Length?
  15. How do I create an expression tree calling IEnumerable.Any(…)?
  16. Intersect LINQ query
  17. LINQ – Query syntax vs method chains & lambda [closed]
  18. Resolving extension methods/LINQ ambiguity
  19. What is the performance of the Last() extension method for List?
  20. Should I use two “where” clauses or “&&” in my LINQ query?
  21. Max or Default?
  22. Performance of Find() vs. FirstOrDefault() [duplicate]
  23. What does this C# code with an “arrow” (=>, an equal sign and greater than sign) mean and how is it called?
  24. Using Linq Except not Working as I Thought
  25. What is the purpose of AsQueryable()?
  26. LINQ query to return a Dictionary
  27. LINQ performance FAQ
  28. A dictionary where value is an anonymous type in C#
  29. How to convert DataTable to class Object?
  30. How do I compose Linq Expressions? ie Func

Leave a Comment