Dictionary Extensions

DictionaryExtensions

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Everhaven.Utility
{
    internal static class DictionaryExtensions
    {
        public static V GetOrNull<K, V>(this Dictionary<K, V> dictionary, K key)
        {
            V existingValue;
            if (dictionary.TryGetValue(key, out existingValue))
            {
                return existingValue;
            }
            else
            {
                return default(V);
            }
        }

        public static V GetOrCreate<K, V>(this Dictionary<K, V> dictionary, K key, Func<V> valueFactory)
        {
            if (key == null) throw new ArgumentException("get or create must supply a key for the dictionary");
            V existingValue;
            if (!dictionary.TryGetValue(key, out existingValue))
            {
                V newValue = valueFactory();
                dictionary.Add(key, newValue);
                return newValue;
            }
            else
            {
                return existingValue;
            }
        }
    }
}