构造函数中base与this的区别

base是对父类的引用，而this是对类本身的引用。

namespace ConsoleApplication1
{
    public class BaseClass
    {
        private string name;
        private int age;
        private string addr;
        public BaseClass()
        {
            Console.WriteLine("No Info");
        }
        public BaseClass(string name)
        {
            this.name = name;
            Console.WriteLine("name=" + this.name);
        }
        public BaseClass(string name, int age)
        {
            this.name = name;
            this.age = age;
            Console.WriteLine(string.Format("name={0},age={1}" ,this.name,this.age));
        }

        public BaseClass(string name, int age,string addr)
        {
            this.name = name;
            this.age = age;
            this.addr = addr;
            Console.WriteLine(string.Format("name={0},age={1},addr={2}", this.name, this.age, this.addr));
        }
    }

    public class ItemClass : BaseClass
    {
        private string name;
        private int age;

        public ItemClass()
            : this("demo")
        {
            //Console.WriteLine("No Info");
        }
        public ItemClass(string name)
            : this("jimmy", 20)
        {
            this.name = name;
            Console.WriteLine("name=" + this.name);
        }
        public ItemClass(string name, int age)
        {
            this.name = name;
            this.age = age;
            Console.WriteLine(string.Format("name={0},age={1}", this.name, this.age));
        }
        public ItemClass(string name,int age,string addr)
            : base("jeason", 20,"shanghai")
        {
            Console.WriteLine("name=" + name);
        }

        public static void Main()
        {
            ItemClass ic1 = new ItemClass("mike");
            ItemClass ic2 = new ItemClass();
            ItemClass ic3 = new ItemClass("mike",21,"chengdu");
        }
    }
}　

子类与基类的构造函数执行顺序：

先调用父类的构造函数进行初始化，再调用继承类的构造函数，如果没有在继承类中指明父类的构造函数，则默认调用父类中无参构造函数，然后调用继承类的构造函数。