类成员初始化与构造函数执行的顺序 转自:http://www.cnblogs.com/anderslly/archive/2008/07/12/whydoinitializersrunintheoppositeorderasconstructors.html

看看下面这段代码，你觉得它会输出什么呢？

    class Foo
    {
        public Foo(string s)
        {
            Console.WriteLine("Foo constructor: {0}", s);
        }

        public void Bar(){}
    }

    class Base
    {
        readonly Foo baseFoo = new Foo("Base initializer");
        public Base()
        {
            Console.WriteLine("Base constructor");
        }
    }

    class Derived : Base
    {
        readonly Foo derivedFoo = new Foo("Derived initializer.");
        public Derived()
        {
            Console.WriteLine("Derived constructor");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new Derived();
        }
    }


总结,类成员的初始化要先于类的构造器执行.
基类的构造器先于子类的构造器的执行.