第八章 泛型类

    class AssembleSample
    {
        static void Main()
        {
            ContactTable cont = new ContactTable(10);
            cont[0] = new Business("李明");
            Assemble a = cont;
            a[1] = new ClassMate("张鹏");
            IOutput i = cont;
            i.Output();
        }
    }

    /// <summary>
    /// 接口IAccessable
    /// </summary>
    public interface IAccessable
    {
        int Length
        {
            get;
        }

        object this[int index]
        {
            get;
            set;
        }

        object GetAt(int index);
        void SetAt(int index, object obj);
    }

    /// <summary>
    /// 抽象类：集合Assemble
    /// </summary>
    public abstract class Assemble:IAccessable
    {
        //字段
        protected object[] m_list;

        //属性
        public int Length
        {
            get
            {
                return m_list.Length;
            }
        }

        //索引函数
        public object this[int index]
        {
            get
            {
                return m_list[index];
            }
            set
            {
                m_list[index] = value;
            }
        }

        //构造函数
        public Assemble(int iLength)
        {
            m_list = new object[iLength];
        }

        //方法
        public object GetAt(int index)
        {
            return m_list[index];
        }

        public void SetAt(int index, object obj)
        {
            m_list[index] = obj;
        }
    }

    /// <summary>
    /// 派生类：联系人集合
    /// </summary>
    public class ContactTable:Assemble,IOutput
    {
        //覆盖索引函数
        public new Contact this[int index]
        {
            get
            {
                return (Contact)m_list[index];
            }
            set
            {
                m_list[index] = value;
            }
        }
        
        //构造函数
        public ContactTable(int iLength)
            : base(iLength)
        {
        }

        //方法
        public new Contact GetAt(int index)
        {
            return (Contact)m_list[index];
        }

        public void SetAt(int index, Contact c)
        {
            m_list[index] = c;
        }

        void IOutput.Output()
        {
            foreach (Contact c in m_list)
            {
                if (c != null)
                    c.Output();
            }
        }

    }