映射对象

  /// <summary>
        /// 将一个对象复制给另一个对象
        /// </summary>
        /// <typeparam name="T">返回的对象类型</typeparam>
        /// <typeparam name="X">原始对象类型</typeparam>
        /// <param name="x">原始对象</param>
        /// <returns>返回T类型对象</returns>
        public static T Mapper<T, X>(X x)
        {
            T t = Activator.CreateInstance<T>(); //创建返回的类型
            var typeParent = t.GetType();//获取返回类型 ==typeof(t)
            var typeSub = x.GetType(); //获取原始对象类型
            foreach (PropertyInfo sp in typeSub.GetProperties())//获得类型的属性字段  
            {
                foreach (PropertyInfo dp in typeParent.GetProperties())
                {
                    if (dp.Name == sp.Name)//判断属性名是否相同  
                    {
                        dp.SetValue(t, sp.GetValue(x, null), null);//获得原对象属性的值复制给新对象的属性  
                    }
                }
            }
            return t;
        }

    public class TestOld
    {
        public int ID { get; set; }

        public string Name { get; set; }

        public int? Age { get; set; }
    }

    public class TestNew
    {
        public int ID { get; set; }      

        public string Name { get; set; }

        public int? Age { get; set; }

        public bool? Sex { get; set; }
    }