InterfaceStudy/InterfaceStudy.Core/ChildB.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace InterfaceStudy.Core
{
    public class ChildB : ExplicitBase
    {
        //可使用new关键字，表明有意隐藏继承成员 ExplicitBase.Number
        int Number = -1;

        public override int GetNumber()
        {
            return --Number;
        }
    }
}