public void TestNullableKeyDictionaryContainsKey()
{
var dict = new NullableKeyDictionary <string, string>(StringComparer.OrdinalIgnoreCase)
{
{ "Hello", "World" },
{ null, "Null" }
};
Assert.IsTrue(dict["hello"] == dict["Hello"]);
Assert.IsTrue(dict.ContainsKey("hello"));
Assert.IsTrue(dict.ContainsKey(null));
}
/// <summary>
/// Determines whether a specified key is in the System.Linq.Lookup<TKey,TElement>.
/// </summary>
/// <param name="key">The key to find in the System.Linq.Lookup<TKey,TElement>.</param>
/// <returns>true if key is in the System.Linq.Lookup<TKey,TElement>; otherwise, false.</returns>
public bool Contains(TKey key)
{
//HACK # Lookup.Contains() hack
// # Work around for doomed (not optimized) System.Linq.Lookup implementation calling GetHashCode() for given key even it holds no elements.
// # Underlying dictionary is optimized and DOES NOT call GetHashCode() for given key if it is EMPTY because it holds NO ELEMENTS TO COMPARE afterwards.
// # Calling for GetHashCode() manually for the sake of System.Linq.Lookup behavior.
if (mKeyGroupPairs.Count == 0)
{
mKeyGroupPairs.Comparer.GetHashCode(key);
}
return(mKeyGroupPairs.ContainsKey(key));
}
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);
}
}