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Last active August 29, 2015 14:02
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Using a custom value type as dictionary key
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answer.md

Dictionary<> will take adventage of key's equality comparer when call Add, Remove, Contains and other methods. If we don't pass a comparer when declaring dictionary, it will use the default comparer. The default comparer will use key's Equals method to compare. So we have two solutions:

  1. Provide a MyKeyEqualityComparer and override its Equals(TKey x, TKey y) method.
  2. Use EqualityComparer<MyKey>.Default and override MyKey's Equals method.
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