Fastest way to Remove Duplicate Value from a list by lambda

by

The easiest way to get a new list would be:

List<long> unique = longs.Distinct().ToList();

Is that good enough for you, or do you need to mutate the existing list? The latter is significantly more long-winded.

Note that Distinct() isn’t guaranteed to preserve the original order, but in the current implementation it will – and that’s the most natural implementation. See my Edulinq blog post about Distinct() for more information.

If you don’t need it to be a List<long>, you could just keep it as:

IEnumerable<long> unique = longs.Distinct();

At this point it will go through the de-duping each time you iterate over unique though. Whether that’s good or not will depend on your requirements.

More Related Contents:

  1. How can I get every nth item from a List?
  2. List OrderBy Alphabetical Order
  3. List thread safety
  4. _=> what does this underscore mean in Lambda expressions?
  5. Check if list contains any of another list
  6. How do I translate an expression tree of one type to a different expression type?
  7. Linq – Where().Where() is AND or OR?
  8. Why would you use Expression rather than Func?
  9. Compare two List objects for equality, ignoring order [duplicate]
  10. How to remove a lambda event handler [duplicate]
  11. Does .NET have a way to check if List a contains all items in List b?
  12. XML Serialize generic list of serializable objects
  13. Combining two lambda expressions in c#
  14. How to merge 2 List and removing duplicate values from it in C#
  15. Should you declare methods using overloads or optional parameters in C# 4.0?
  16. Cancelling a Task is throwing an exception
  17. Pass expression parameter as argument to another expression
  18. How to handle add to list event?
  19. Generic List – moving an item within the list
  20. How do I check if a property exists on a dynamic anonymous type in c#?
  21. Directly sending keystrokes to another process via hooking
  22. Does the System.Windows.Forms.Timer run on a different thread than the UI?
  23. Count property vs Count() method?
  24. Lambda Expression using Foreach Clause [duplicate]
  25. List.Except is not working
  26. Parallel.ForEach with adding to list
  27. Multi-dimensional arraylist or list in C#?
  28. Linq query or Lambda expression?
  29. Creating a property setter delegate
  30. C#: Default implementation for == and != operators for objects

Leave a Comment