DateTime.Today.DayOfWeek 所获得英文转换中文

int   i=(int)DateTime.Today.DayOfWeek;
            string xingqi="";
            switch (i)
            {
                case 0:
                    xingqi = "日";
                    break;
                case 1:
                    xingqi = "一";
                    break;
                case 2:
                    xingqi = "二";
                    break;
                case 3:
                    xingqi = "三";
                    break;
                case 4:
                    xingqi = "四";
                    break;
                case 5:
                    xingqi = "五";
                    break;
                case 6: xingqi = "六";
                    break;

            }

加指定天数：DateTime.Now.AddDays(i).ToString("MM-dd")   i为需加天数