internal void Add(TKey key, TElement element)
{
//TODO # Lookup.Add() optimization
// # Before adding a new key, TryGetValue() method is used to obtain grouping if the key already exists
// # Using TryGetValue() triggers an extra call to GetHashCode() of comparer
// # Lookup.Add() method requires an optimized adding mechanism
IGrouping <TKey, TElement> grouping;
if (!mKeyGroupPairs.TryGetValue(key, out grouping))
{
grouping = new Grouping <TKey, TElement>(key);
mKeyGroupPairs.Add(key, grouping);
}
((Grouping <TKey, TElement>)grouping).Add(element);
}
public void NullableKeyDictionaryTest()
{
int value = 0;
IDictionary <string, int> target = new NullableKeyDictionary <string, int>();
target.Add(null, 13);
target.Add(new KeyValuePair <string, int>("a", 14));
Assert.IsTrue(target.ContainsKey(null));
Assert.IsTrue(target.ContainsKey("a"));
Assert.IsTrue(target.Contains(new KeyValuePair <string, int>(null, 13)));
Assert.IsTrue(target.Contains(new KeyValuePair <string, int>("a", 14)));
Assert.IsTrue(target.Keys.Contains(null));
Assert.IsTrue(target.Keys.Contains("a"));
Assert.IsTrue(target.Values.Contains(13));
Assert.IsTrue(target.Values.Contains(14));
Assert.AreEqual(target.Count, 2);
Assert.IsTrue(target.TryGetValue(null, out value));
Assert.AreEqual(value, 13);
Assert.IsTrue(target.TryGetValue("a", out value));
Assert.AreEqual(value, 14);
foreach (KeyValuePair <string, int> item in target)
{
Console.WriteLine(item);
}
Assert.IsTrue(target.Remove(null));
Assert.IsFalse(target.Remove(new KeyValuePair <string, int>(null, 13)));
Assert.IsTrue(target.Remove("a"));
Assert.IsFalse(target.Remove(new KeyValuePair <string, int>("a", 14)));
foreach (KeyValuePair <string, int> item in target)
{
Console.WriteLine(item);
}
}