How to use enum types in C#?

In C#, enums are a special data type used to represent a group of related named constants. Enums can be used in a program to better clarify specific values in the code.

Here are some common methods using enum types:

1. Declaration of an enumeration type:

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

1. Use values of enumeration type.

DaysOfWeek today = DaysOfWeek.Monday;
Console.WriteLine(today);  // 输出 Monday

1. Compare values using an enum type:

DaysOfWeek today = DaysOfWeek.Wednesday;
if (today == DaysOfWeek.Wednesday) {
    Console.WriteLine("今天是星期三");
}

1. Use enumerated values for branch selection in a switch statement.

DaysOfWeek today = DaysOfWeek.Tuesday;
switch (today) {
    case DaysOfWeek.Monday:
        Console.WriteLine("今天是星期一");
        break;
    case DaysOfWeek.Tuesday:
        Console.WriteLine("今天是星期二");
        break;
    // ...
    default:
        Console.WriteLine("今天不是工作日");
        break;
}

1. Passing or returning enumerated values as method parameters.

DaysOfWeek GetNextDay(DaysOfWeek currentDay) {
    if (currentDay == DaysOfWeek.Sunday) {
        return DaysOfWeek.Monday;
    }
    else {
        return (DaysOfWeek)((int)currentDay + 1);
    }
}

DaysOfWeek tomorrow = GetNextDay(DaysOfWeek.Tuesday);
Console.WriteLine(tomorrow);  // 输出 Wednesday

1. Obtain the string representation of an enumeration type.

DaysOfWeek today = DaysOfWeek.Thursday;
string dayString = today.ToString();
Console.WriteLine(dayString);  // 输出 Thursday

Using enumeration types can make code more readable and maintainable because they provide a more intuitive way to represent a set of related constant values.