CollectionExtensions.cs

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

namespace OhiraKyou.Extensions {
	
	public static class CollectionExtensions {

		public static Dictionary<TKey, TValue> WithoutNullKeys<TKey, TValue> (this Dictionary<TKey, TValue> dictionary) {
			return (from kv in dictionary
					where kv.Value != null
					select kv).ToDictionary(kv => kv.Key, kv => kv.Value);
		}

	}
	
}