Why does ConcurrentDictionary.TryRemove require a second out argument?

Question

I only want to remove a value.. I don\'t need to use the variable afterwards. Why not include an overload where this second parameter was not required?

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Answer 1

You can create exactly the method you want:

public static class ConcurrentDictionaryEx {
  public static bool TryRemove(
    this ConcurrentDictionary self, TKey key) {
    TValue ignored;
    return self.TryRemove(key, out ignored);
  }
}

UPDATE: Or, as Dialecticus mentioned in the comments, just use Remove. But note that, since it's an explicit interface implementation, you'll need a reference to an IDictionary, which leads you back to creating an extension method if you want to avoid casting a ConcurrentDictionary reference:

public static class ConcurrentDictionaryEx {
  public static bool Remove(
    this ConcurrentDictionary self, TKey key) {
      return ((IDictionary)self).Remove(key);
  }
}