Public ReadOnly Property Keys As ICollection(Of TKey)

public ICollection<TKey> Keys {get;}

SynchronizedDictionary<string, string> test = new SynchronizedDictionary<string, string>(new Dictionary<string,string>(), new IgnoreLocking());
test["a"] = "b";
string all = String.Join("", new List<string>(test.Keys).ToArray());
Assert.AreEqual("a", all);

Dim test As New SynchronizedDictionary(Of String, String)(New Dictionary(Of String, String)(), New IgnoreLocking())
test("a") = "b"
Dim all As String = [String].Join("", New List(Of String)(test.Keys).ToArray())
Assert.AreEqual("a", all)