C# 子类与父类互转注意项

昨晚在处理父类与子类相互转换时，想把父类转换子类对象，发现编译不通过 ，类定义如下:

 public interface IPeople
    {
        int Age {
            get;
            set;
        }

        string Name {
            get;
            set;
        }
    }

   public class People : IPeople
    {
        public int Age { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
        public string Name { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    }

public class Student : People
    {
      
    }

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