为泛型列表创建迭代器
在本示例中,泛型类Stack<T>实现泛型接口 IEnumerator<T>。声明了一个类型 T 的数组,并使用 Push 方法给数组赋值。在 GetEnumerator 方法中,使用 yield return 语句返回数组的值。
还实现非泛型 GetEnumerator,因为 IEnumerable<T> 继承自 IEnumerable。此示例显示了典型的实现,在该实现中,非泛型方法直接将调用转给泛型方法。
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输出
9 8 7 6 5 4 3 2 1 0
9 8 7 6 5 4 3 2 1 0
0 1 2 3 4 5 6 7 8 9
9 8 7 6 5 4 3