1>下拉列表

@Html.DropDownList("PayStatus", new List
     
      () {             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
     
       GetEven()            {                foreach (int i in ints)                    if (i % 2 == 0)                        yield return i;            }            public static IEnumerable
      
        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();        }