Question

我在任务计划程序类中有以下枚举值，而我正在创建一个任务，我需要根据复选框选择添加一周中的几天。如果选中星期一复选框，我只需要在星期一通过（如果同时选中其他复选框，则需要多天）。

在下面的代码中，如何动态传递多天？

public enum DaysOfTheWeek: short
{
    Sunday = 1,
    Monday = 2,
    Tuesday = 4,
    Wednesday = 8,
    Thursday = 16,
    Friday = 32,
    Saturday = 64,
    AllDays = 127
}

DaysOfWeek = DaysOfTheWeek.Monday | DaysOfTheWeek.Sunday;

Answer 1

您可以像这样循环选择列表并创建枚举值：

var days = new[] {1, 4, 32};

var daysOfTheWeek = DaysOfTheWeek.None;
foreach (var day in days)
{
    daysOfTheWeek = daysOfTheWeek | (DaysOfTheWeek) day;
}

[Flags]
public enum DaysOfTheWeek
{
    None = 0,
    Sunday = 1,
    Monday = 2,
    Tuesday = 4,
    Wednesday = 8,
    Thursday = 16,
    Friday = 32,
    Saturday = 64,
    AllDays = 128
}

Answer 2

您的问题没有提及循环，但您对我的评论的回复确实如此。你的意思是：

DaysOfWeek = DaysOfTheWeek.Monday | DaysOfTheWeek.Sunday;

foreach (int day in Enum.GetValues(typeof(DaysOfTheWeek)))
{
    if ( day & DaysOfWeek ) {
        /* do something for this day */
    }
}

Answer 3

使用Flags属性装饰你的枚举：

[Flags]
public enum DaysOfTheWeek : short

声明一个DaysOfTheWeek变量并将其初始化为零：

DaysOfTheWeek days = 0;

为每天勾选的枚举值添加标记。将bool sunday = true, wednesday = true;替换为您的代码，该代码会检查复选框：

bool sunday = true, wednesday = true; // this is just proof of concept

if (sunday)
    days |= DaysOfTheWeek.Sunday;
if (wednesday)
    days |= DaysOfTheWeek.Wednesday;

days输出：

周日，周三

Answer 4

正如 Shahriar Gholami 所建议的那样，这里有完整的代码：

class Program
{
    static void Main(string[] args)
    {
        var daysOfWeek = GetDaysOfTheWeek(new List<DaysOfTheWeek> {DaysOfTheWeek.Monday, DaysOfTheWeek.Sunday});
        Console.WriteLine(daysOfWeek); //3
    }

    public static DaysOfTheWeek GetDaysOfTheWeek(List<DaysOfTheWeek> selectedDays)
    {
        var daysOfTheWeek = DaysOfTheWeek.None;
        foreach (var day in selectedDays)
        {
            daysOfTheWeek = daysOfTheWeek | day;
        }
        return daysOfTheWeek;
    }
}

[Flags]
public enum DaysOfTheWeek : short
{
    None = 0,
    Sunday = 1,
    Monday = 2,
    Tuesday = 4,
    Wednesday = 8,
    Thursday = 16,
    Friday = 32,
    Saturday = 64,
    AllDays = 127
}

如何通过代码动态传递DaysOfTheWeek枚举值

4 个答案: