下面的C#代码实现一个索引器:代码最后的执行结果为( ) class TestIndex{ public int [] Elements = new int [ 100 ]; public int Elements[ int index ] { get {return Elements[ index ];} set {Elements[index] = value;} } } class Class1{ static void Main( string [] args){ TestIndex ti = new TestIndex (); int cnt = 0 ; for (cnt = 0 ; cnt < 5 ; cnt ++ ) {ti.Elements[cnt] = cnt * cnt;} for (cnt = 0 ; cnt < 5 ; cnt ++ ) {Console.WriteLine(ti[cnt].ToString());} Console.ReadLine(); } }