try-finally

 class Program
    {
        static void Main(string[] args)
        {
            Program pr = new Program();
            testret ret = pr.dosome();
            Console.WriteLine(pr.doint());//值类型
            Console.WriteLine(ret.Name);//这里引用类型，方法内对于参数的修改也会带到方法外，这里可以证明就算return语句在try中，finally的代码也一定会执行。           
            Console.ReadKey();
        }
        private int doint()
        {
            int i = 0;
            try { i = 1; return i; }
            finally
            {
                i = 2;
                Console.WriteLine("finally int");
            }
            return i;
        }
        private testret dosome()
        {
            testret re = null;
            try
            {
                re = new testret() { Name = "1" };
                return re;
            }
            finally
            {
                re.Name = "2"; re = null;
                Console.WriteLine("finally ref");
            }
        }
    }
    class testret
    {
        public string Name { get; set; }
    }

doint方法 用reflector查看il代码，如下：

private int doint()
{
    int CS$1$0000;
    int i = 0;
    try
    {
        i = 1;
        CS$1$0000 = i;
    }
    finally
    {
        Console.WriteLine("finally int" + 2);
    }
    return CS$1$0000;
}

 

 

dosome：

private testret dosome()
{
    testret re = null;
    testret CS$1$0000;
    try
    {
        testret <>g__initLocal0 = new testret {
            Name = "1"
        };
        re = <>g__initLocal0;
        CS$1$0000 = re;
    }
    finally
    {
        re.Name = "2";
        re = null;
        Console.WriteLine("finally ref");
    }
    return CS$1$0000;
}

 

 

不存在一种打破try-finally执行顺序的情况。除非应用程序在try中退出了。