C# – Duplicate keys in .NET dictionaries


Are there any dictionary classes in the .NET base class library which allow duplicate keys to be used? The only solution I've found is to create, for example, a class like:

Dictionary<string, List<object>>

But this is quite irritating to actually use. In Java, I believe a MultiMap accomplishes this, but cannot find an analog in .NET.

Best Solution

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 :(