ASP.NET MVC3 常用小积累

　1>下拉列表

@Html.DropDownList("PayStatus", new List<SelectListItem>() { 
            new SelectListItem{ Text="未到账", Value ="0"},
            new SelectListItem{ Text="已到账", Value ="1"}
        }, "-- 请选择 --", new { @class = "search_select" })

 2>decimal保留两位小数

　　　　string.Format("{0:F}",xxxx)

 3>yield return　　　　

　　　　public static class NumberList
        {
            public static int[] ints = { 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377 };
            
            public static IEnumerable<int> GetEven()
            {
                foreach (int i in ints)
                    if (i % 2 == 0)
                        yield return i;
            }

            public static IEnumerable<int> GetOdd()
            {
                foreach (int i in ints)
                    if (i % 2 == 1)
                        yield return i;
            }
        }

        static void Main(string[] args)
        {

            //  2, 8,  34, 144
            Console.WriteLine("Even numbers");
            foreach (int i in NumberList.GetEven())
                Console.WriteLine(i);

            //1, 3, 5, 13, 21,55, 89,233, 377
            Console.WriteLine("Odd numbers");
            foreach (int i in NumberList.GetOdd())
                Console.WriteLine(i);

            Console.ReadKey();
        }