Public Property KeyComparer As IComparer(Of TKey)

public IComparer<TKey> KeyComparer {get; set;}

Dictionary<int, string> test = new Dictionary<int, string>();
List<IEnumerable<KeyValuePair<int, string>>> sets = 
    new List<IEnumerable<KeyValuePair<int, string>>>(CreateSets(2, 100, test));
foreach (KeyValuePair<int, string> pair in 
    OrderedKeyValuePairs<int, string>.Merge(Options.KeyComparer, DuplicateHandling.LastValueWins, sets.ToArray()))
{
    string val;
    Assert.IsTrue(test.TryGetValue(pair.Key, out val));
    Assert.AreEqual(pair.Value, val);
    Assert.IsTrue(test.Remove(pair.Key));
}

Assert.AreEqual(0, test.Count);

Dim test As New Dictionary(Of Integer, String)()
Dim sets As New List(Of IEnumerable(Of KeyValuePair(Of Integer, String)))(CreateSets(2, 100, test))
For Each pair As KeyValuePair(Of Integer, String) In OrderedKeyValuePairs(Of Integer, String).Merge(Options.KeyComparer, DuplicateHandling.LastValueWins, sets.ToArray())
    Dim val As String
    Assert.IsTrue(test.TryGetValue(pair.Key, val))
    Assert.AreEqual(pair.Value, val)
    Assert.IsTrue(test.Remove(pair.Key))
Next

Assert.AreEqual(0, test.Count)