public void Test()
        {
            IBusinessObjectCollection collection = new BusinessObjectCollection();

            collection.Add(new Student(2, "B"));
            collection.Add(new Student(1, "C"));
            collection.Add(new Student(3, "A"));

            // 验证算法的有效性
            collection.Comparer = new ComparerByID();
            int id = 0;

            foreach (IBusinessObject obj in collection.GetAll())
            {
                Assert.AreEqual <int>(++id, obj.ID);
            }

            // 替换成另一个算法
            collection.Comparer = new ComparerByName();
            string[] data = new string[3] {
                "A", "B", "C"
            };
            int index = 0;

            foreach (IBusinessObject obj in collection.GetAll())
            {
                Assert.AreEqual <string>(data[index++], obj.Name);
            }
        }