How do you convert a dictionary to a ConcurrentDictionary?

Question

I have seen how to convert a ConcurrentDictionary to a Dictionary, but I have a dictionary and would like to convert to a ConcurrentDictionary. How do I do that?... better

Answer 1

Why not write your own extension method:

  public static class ConcurrentDictionaryExtensions {
    public static ConcurrentDictionary ToConcurrentDictionary(this IEnumerable source, Func keySelector, Func elementSelector, IEqualityComparer comparer) {
        if (source == null) throw new ArgumentNullException("source");
        if (keySelector == null) throw new ArgumentNullException("keySelector");
        if (elementSelector == null) throw new ArgumentNullException("elementSelector");

        ConcurrentDictionary d = new ConcurrentDictionary(comparer ?? EqualityComparer.Default);
        foreach (TSource element in source)
            d.TryAdd(keySelector(element), elementSelector(element));

        return d;
    }

    public static ConcurrentDictionary ToConcurrentDictionary(this IEnumerable source, Func keySelector) {
        return ToConcurrentDictionary(source, keySelector, IdentityFunction.Instance, null);
    }

    public static ConcurrentDictionary ToConcurrentDictionary(this IEnumerable source, Func keySelector, IEqualityComparer comparer) {
        return ToConcurrentDictionary(source, keySelector, IdentityFunction.Instance, comparer);
    }

    public static ConcurrentDictionary ToConcurrentDictionary(this IEnumerable source, Func keySelector, Func elementSelector) {
        return ToConcurrentDictionary(source, keySelector, elementSelector, null);
    }

    internal class IdentityFunction {
        public static Func Instance
        {
            get { return x => x; }
        }
    }

}

Simply adopted the code from the .Net framework.