C#判断某日为一个星期的第几天

直接上代码：

 int dayinweek = 0;
            string week = datetime.today.dayofweek.tostring();
            #region 获取dayinweek值
            switch (week)
            {
                case "monday":
                    dayinweek = 1;
                    break;
                case "tuesday":
                    dayinweek = 2;
                    break;
                case "wednesday":
                    dayinweek = 3;
                    break;
                case "thursday":
                    dayinweek = 4;
                    break;
                case "friday":
                    dayinweek = 5;
                    break;
                case "saturday":
                    dayinweek = 6;
                    break;
                case "sunday":
                    dayinweek = 7;
                    break;
            }