Duplicate keys in .NET dictionaries?

by

If you’re using .NET 3.5, use the Lookup class.

EDIT: You generally create a Lookup using Enumerable.ToLookup. This does assume that you don’t need to change it afterwards – but I typically find that’s good enough.

If that doesn’t work for you, I don’t think there’s anything in the framework which will help – and using the dictionary is as good as it gets 🙁

More Related Contents:

  1. How do you sort a dictionary by value?
  2. The order of elements in Dictionary
  3. Serialize Class containing Dictionary member
  4. Why is a Dictionary “not ordered”?
  5. .NET HashTable Vs Dictionary – Can the Dictionary be as fast?
  6. Mapping object to dictionary and vice versa
  7. C# dictionary – one key, many values
  8. DataGridView bound to a Dictionary
  9. Static Generic Class as Dictionary
  10. Is there an IDictionary implementation that, on missing key, returns the default value instead of throwing?
  11. Two-way / bidirectional Dictionary in C#?
  12. .NET ObservableDictionary
  13. Convert Dictionary To Anonymous Object?
  14. A dictionary object that uses ranges of values for keys
  15. Does C# have a way of giving me an immutable Dictionary?
  16. Dictionary.ContainsKey return False, but a want True
  17. How to get around lack of covariance with IReadOnlyDictionary?
  18. Reverse Sorted Dictionary in .NET
  19. How to convert object to Dictionary in C#?
  20. Remove Item in Dictionary based on Value
  21. LINQ query to return a Dictionary
  22. How to sort a dictionary by key
  23. A dictionary where value is an anonymous type in C#
  24. Accessing a Dictionary.Keys Key through a numeric index
  25. Why doesn’t Dictionary have AddRange?
  26. Get the last element in a dictionary?
  27. Map two lists into a dictionary in C#
  28. How to implement ConcurrentHashSet in .Net
  29. DISTINCT() and ORDERBY issue
  30. How does StringBuilder work internally in C#?

Leave a Comment