C#中对虚拟属性和抽象属性的重写有什么异同

       public abstract class A

        {

            //抽象属性不能有实现代码

            public abstract string AbstractProperty { get; set; }

 

            string s;

            //虚拟属性可以有实现代码

            public virtual string VritualProperty

            {

                get { return this.s; }

                set { this.s = value.ToUpper(); }

            }

        }

 

        public class B : A

        {

            string message;

            //在继承类（子类）中必须提供抽象属性的实现

            public override string AbstractProperty

            {

                get { return message; }

                set { this.message = value; }

            }

 

            //重写属性可以调用基类中的实现

            public override string VritualProperty

            {

                get

                {

                    return base.VritualProperty;

                }

                set

                {

                    base.VritualProperty = value;

                }

            }

        }