C# 中的枚举类型约束 [重复]

枚举类型约束在C#中的应用

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

Weekday today = Weekday.Monday;
if(today == Weekday.Monday)
{
    Console.WriteLine("今天是星期一。");
}

public void PrintEnumName(T value) where T : Enum
{
    Console.WriteLine(value.ToString());
}

public int CountWorkdays(T[] days) where T : Enum
{
    int count = 0;
    foreach(T day in days)
    {
        if(day != Weekday.Saturday && day != Weekday.Sunday)
        {
            count++;
        }
    }
    return count;
}