如何在切换语句中使用C#枚举，同时保持其余代码不变

enum DayOfWeek
{
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
}

class Program
{
    static void Main(string[] args)
    {
        DayOfWeek day = DayOfWeek.Monday;

        switch (day)
        {
            case DayOfWeek.Monday:
                Console.WriteLine("今天是星期一");
                break;
            case DayOfWeek.Tuesday:
                Console.WriteLine("今天是星期二");
                break;
            case DayOfWeek.Wednesday:
                Console.WriteLine("今天是星期三");
                break;
            case DayOfWeek.Thursday:
                Console.WriteLine("今天是星期四");
                break;
            case DayOfWeek.Friday:
                Console.WriteLine("今天是星期五");
                break;
            case DayOfWeek.Saturday:
                Console.WriteLine("今天是星期六");
                break;
            case DayOfWeek.Sunday:
                Console.WriteLine("今天是星期日");
                break;
            default:
                Console.WriteLine("无效的日期");
                break;
        }

        // 其余代码
        // ...
    }
}