Virtual作用:子类可以对父类重写,虚方法是对多态特征体现.代表一类对象的所具有的公共属性或方法. public class Animal { public string Name { get; set; } public virtual void Eat() { Console.WriteLine("{0}正在吃草",Name); } } public class Sheep : Animal { public Sheep(){ Name = "羊"; } p…
两者都是按地址传递的,使用后都将改变原来参数的数值. class Program { static void Main(string[] args) { int num = 1; Method(ref num); Console.WriteLine(num); Console.ReadKey(); } public static void Method(ref int num) { num += 5; } } class Program { static void Main(string[] a…
