public class IDisponseTest : IDisposable     {         private bool isReadyDisposed = false;         ~IDisponseTest()         {             //析构函数调用时不释放托管资源，因为交由GC进行释放             Disponse(false);         }         public void Dispose()         {             //用户手动释放托管资源和非托管资源             Disponse(true);             //用户已经释放了托管和非托管资源，所以不需要再调用析构函数             GC.SuppressFinalize(this);             //如果子类继承此类时，需要按照如下写法进行。             //try             //{             //    Disponse(true);             //}             //finally             //{             //    base.Disponse();             //}         }         public virtual void Disponse(bool isDisponse)         {             //isReadyDisposed是控制只有第一次调用Disponse才有效才需要释放托管和非托管资源             if (isReadyDisposed)                 return;             if (isDisponse)             {                 //析构函数调用时不释放托管资源，因为交由GC进行释放                 //如果析构函数释放托管资源可能之前GC释放过，就会导致出现异常                 //托管资源释放             }             //非托管资源释放             isReadyDisposed = true;         }     }

class Program     {         static void Main(string[] args)         {             CubeEnum cubelist = new CubeEnum(50);             foreach(Cube cube in cubelist)             {                 Console.WriteLine("立方体长：" + cube.Length + ",宽" + cube.Width + ",高" + cube.Height);             }             Console.Read();         }     }     //立方体，长、宽、高     public class Cube     {         public int Length { get; set; }         public int Width { get; set; }         public int Height { get; set; }     }     /// <summary>     /// 立方体迭代集合，继承了IEnumerable和IEnumerator     /// </summary>     public class CubeEnum : IEnumerable, IEnumerator     {         //索引         public int Index { get; set; }         //立方体集合         public Cube[] cubelist { get; set; }         //初始化立方体集合         public CubeEnum(int count)         {             this.Index = -1;             cubelist = new Cube[count];             for (int i = 0; i < count; i++)             {                 cubelist[i] = new Cube();                 cubelist[i].Length = i * 10;                 cubelist[i].Width = i * 10;                 cubelist[i].Height = i * 10;             }         }         //实现IEnumerable的 GetEnumerator() 方法获得IEnumerator对象         public IEnumerator GetEnumerator()         {             return (IEnumerator)this;         }         //当前Cube立方体         public object Current         {             get { return cubelist[Index]; }         }         //往下一步移动         public bool MoveNext()         {             Index++;             if (Index < cubelist.Length)             {                 return true;             }             return false;         }         //重置索引         public void Reset()         {             Index = -1;         }     }