C#中有关数组和string引用类型或值类型的判断

 class value_ref_type
    {
        public static void DEMO1()
        {
            double[] location = new double[2] { 1.256589, 489789 };
            double[] location_new;
            string str_1, str_2;

            Console.Out.WriteLine("ori location: x,{0};y{1}", location[0], location[1]);
            location_new = location;
            location[0] = 1.11111111111;
            str_1 = "weng";
            str_2 = str_1;
            str_1 = "jun";
            ChangeStrValue(str_2);

            Console.Out.WriteLine("out location: x,{0};y{1}", location_new[0], location_new[1]);
            Console.Out.WriteLine("out str ref: str1,{0};str2,{1}", str_1, str_2);
        }

        public static void ChangeStrValue(string str)
        {
            str = "tom";
        }
    }