关于数据类型转换

代码

        static void Main()
        {
            try
            {
                ArrayList array = new ArrayList();

                Console.WriteLine("注入int类型的数据");
                int x = 12;
                array.Add(x);
                x = 14;
                array.Add(x);

                Console.WriteLine(" Object - INT");
                foreach (object obj in array)
                {
                    int temp = 0;

                    int.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }
                
                Console.WriteLine(" Object - LONG");
                foreach (object obj in array)
                {
                    long temp = 0;

                    long.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }

                Console.WriteLine(" INT ");
                foreach (int obj in array)
                {
                    Console.WriteLine("obj:{0} ", obj);
                }

                //Console.WriteLine(" LONG ");  //--Error
                //foreach (long obj in array)
                //{
                //    Console.WriteLine("obj:{0} ", obj);
                //}


                Console.WriteLine("\r\n\r\n");
                Console.WriteLine("注入long类型的数据");

                long y = 20;
                array.Add(y);
                y = 24;
                array.Add(y);

                Console.WriteLine(" Object - INT ");
                foreach (object obj in array)
                {
                    int temp = 0;

                    int.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }

                Console.WriteLine(" Object - LONG ");
                foreach (object obj in array)
                {
                    long temp = 0;

                    long.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }

                //Console.WriteLine(" LONG ");
                //foreach (long obj in array)  //-- Error
                //{
                //    Console.WriteLine("obj:{0} ", obj);
                //}

                //Console.WriteLine(" INT ");
                //foreach (int obj in array)  //-- Error
                //{
                //    Console.WriteLine("obj:{0} ", obj);
                //}


            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

            Console.ReadLine();
        }

上面的代码不用说简单的很，如果单独的使用C#语言或者说是在数据类型明确的情况下、进行数据类型转换使用下面的这种方式也是没有太大问题的：

代码

                Console.WriteLine(" INT ");
                foreach (int obj in array)
                {
                    Console.WriteLine("obj:{0} ", obj);
                }

                Console.WriteLine(" LONG");
                foreach (long obj in array)
                {
                    Console.WriteLine("obj:{0} ", obj);
                }

但是如果是在额外的一些情况下：例如我遇到的利用Socket传输json，对方发过来的数据明明定义的是64位的，而我这里解析json时ArraryList里存放的数据却是32位的，唉…… 为了安全还是用下面的方式吧：

代码

                Console.WriteLine(" Object - INT");
                foreach (object obj in array)
                {
                    int temp = 0;

                    int.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }
                
                Console.WriteLine(" Object - LONG");
                foreach (object obj in array)
                {
                    long temp = 0;

                    long.TryParse(obj.ToString().Trim(), out temp);

                    Console.WriteLine("obj:{0} ", temp);
                }