MongoDB.Driver.Document.Contains C# (CSharp) Метод

        public bool Contains(String key)
        {
            return (orderedKeys.Contains(key));
        }

 public void TestRemove()
 {
     Document d = new Document();
     d["one"] = 1;
     d.Remove("one");
     Assert.IsFalse(d.Contains("one"));
 }