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Asked: 2026-06-03T13:07:44+00:00

I want to create a Dictionary<DateTime, Dictionary<APerson, AVisit>> struct and I want to supply

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I want to create a Dictionary<DateTime, Dictionary<APerson, AVisit>> struct and I want to supply an IEqualityComparer on the second dictionary that holds an APerson as key

If I only had the inner dictionary it would be

var f = new Dictionary<APerson, AVisit>(new PersonEqualityComparer());

But I cannot find a constructor to supply it in the declaration. Do I have to pass it in every child declaration of Dictionary<APerson, AVisit> or is possible to instruct the mother struct to have a specified IEqualityComparer all the time?

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1 Answer

  1. Editorial Team

    Do I have to pass it in every child declaration of Dictionary

    Yes (if by this you mean every instance of Dictionary<APerson, AVisit>).

    or is possible to instruct the mother struct to have a specified IEqualityComparer all the time?

    No.

    But, you can reorganize. Instead of 

    Dictionary<DateTime, Dictionary<APerson, AVisit>>

    why not

    Dictionary<Tuple<DateTime, APerson>, AVisit>

    Then you can supply exactly one instance of something that implements

    IEqualityComparer<Tuple<DateTime, APerson>>

    You might even replace Tuple<DateTime, APerson> with a custom type.

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