A curry (sorta) function for adding/updating a Dictionary<TKey, List<TValue>>

CurryAddUpdateExtension.cs

public static class Extensions
{
	public static Action<TKey, TValue> CurryAddUpdate<TKey,TValue>(this Dictionary<TKey, List<TValue>> dict)
	{
		Action<TKey, TValue> op = (key, val) => {
			if(dict.ContainsKey(key))
			{
				dict[key].Add(val);
			} else {
				dict.Add(key, new List<TValue>(new TValue[]{val}));
			}
		};
		
		return op;
	}
}