/// <summary>
/// Test LINQ queries on the dictionary.
/// </summary>
/// <typeparam name="TKey">Key type of the dictionary.</typeparam>
/// <typeparam name="TValue">Value type of the dictionary.</typeparam>
/// <param name="dictionary">The dictionary to test.</param>
/// <param name="key">Key that is present in the dictionary.</param>
/// <param name="value">Value associated with the key in the dictionary.</param>
private static void TestDictionaryLinq <TKey, TValue>(PersistentDictionary <TKey, TValue> dictionary, TKey key, TValue value)
where TKey : IComparable <TKey>
{
var kvp = new KeyValuePair <TKey, TValue>(key, value);
Assert.IsTrue(dictionary.Any(x => 0 == x.Key.CompareTo(key)), "Any == should have found {0}", key);
Assert.IsTrue(dictionary.Any(x => 0 <= x.Key.CompareTo(key)), "Any <= should have found {0}", key);
Assert.IsTrue(dictionary.Any(x => 0 >= x.Key.CompareTo(key)), "Any >= should have found {0}", key);
Assert.IsTrue(dictionary.Any(x => !(0 != x.Key.CompareTo(key))), "Any !(!=) should have found {0}", key);
var query = from x in dictionary where x.Key.CompareTo(key) == 0 select x.Value;
Assert.AreEqual(value, query.Single(), "Where == failed");
query = from x in dictionary where x.Key.CompareTo(key) == 0 select x.Value;
Assert.AreEqual(value, query.Reverse().Single(), "Where == failed (reversed)");
query = from x in dictionary where x.Key.CompareTo(key) <= 0 select x.Value;
Assert.AreEqual(value, query.Single(), "Where <= failed");
query = from x in dictionary where x.Key.CompareTo(key) >= 0 select x.Value;
Assert.AreEqual(value, query.Single(), "Where >= failed");
query = from x in dictionary where !(x.Key.CompareTo(key) != 0) select x.Value;
Assert.AreEqual(value, query.Single(), "Where !(!=) failed");
Assert.AreEqual(kvp, dictionary.Where(x => x.Key.CompareTo(key) >= 0).Reverse().Last(), "Where.Reverse.Last failed");
Assert.AreEqual(kvp, dictionary.First(), "First");
Assert.AreEqual(kvp, dictionary.First(x => x.Key.CompareTo(key) == 0), "First");
Assert.AreEqual(kvp, dictionary.FirstOrDefault(), "FirstOrDefault");
Assert.AreEqual(kvp, dictionary.FirstOrDefault(x => x.Key.CompareTo(key) == 0), "FirstOrDefault");
Assert.AreEqual(kvp, dictionary.Last(), "Last");
Assert.AreEqual(kvp, dictionary.Last(x => x.Key.CompareTo(key) == 0), "Last");
Assert.AreEqual(kvp, dictionary.LastOrDefault(), "LastOrDefault");
Assert.AreEqual(kvp, dictionary.LastOrDefault(x => x.Key.CompareTo(key) == 0), "LastOrDefault");
Assert.AreEqual(1, dictionary.Count(x => x.Key.CompareTo(key) <= 0), "Count failed");
}
public void VerifyLastOrDefaultThrowsExceptionWhenExpressionIsNull()
{
using (var persistentDictionary = new PersistentDictionary <Guid, Guid>(DictionaryLocation))
{
persistentDictionary.LastOrDefault(null);
}
}