C# Enum标志-两种方式绑定-enum - class -enum
C# Enum标志-两种方式绑定-enum - class -enum
提问于 2015-07-16 21:18:40
我有下面的内容
[Flags]
public enum WeekDays
{
Monday = 1,
Tuesday = 2,
Wednesday = 4,
Thursday = 8,
Friday = 16,
Saturday = 32,
Sunday = 64
}在UI中，用户可以选择ceratain :例如星期一、星期二、星期三。星期一、星期二、星期三的用户选择为7。此值保存在名为Days的列中的数据库中。
如果我有课的话：
public class Week
{
public bool Monday { get; set; }
public bool Tuesday { get; set; }
public bool Wednesday { get; set; }
public bool Thursday { get; set; }
public bool Friday { get; set; }
public bool Saturday { get; set; }
public bool Sunday { get; set; }
}如何绑定该值7并使适当的属性为真或假。例句:7相当于星期一，星期二，星期三晚上。如果将值7转换为班级周，结果将是属性:星期一、星期二、星期三为真，其余为假。
如果我有一个课程周，其中属性:星期一，星期二，星期三是真的，并将其转换为一个枚举WeekDays，结果将是7。
我怎么能这么做？
回答 3
Stack Overflow用户
回答已采纳
发布于 2015-07-16 21:40:34
可以使Week具有类型为WeekDays的属性或字段，该属性或字段跟踪哪些标志处于活动状态。然后，您的所有布尔属性只需检查枚举值，并在set上正确更新它。这允许您这样做：
Week w = new Week();
w.Monday = true;
Console.WriteLine(w.Days); // Monday
w.Tuesday = true;
w.Wednesday = true;
Console.WriteLine(w.Days); // Monday, Tuesday, Wednesday请参阅下面的Week代码，它非常冗长(尽管引入了SetDaysFlag助手方法)：
public class Week
{
public WeekDays Days
{ get; set; }
public bool Monday
{
get { return (Days & WeekDays.Monday) != 0; }
set { SetDaysFlag(WeekDays.Monday, value); }
}
public bool Tuesday
{
get { return (Days & WeekDays.Tuesday) != 0; }
set { SetDaysFlag(WeekDays.Tuesday, value); }
}
public bool Wednesday
{
get { return (Days & WeekDays.Wednesday) != 0; }
set { SetDaysFlag(WeekDays.Wednesday, value); }
}
public bool Thursday
{
get { return (Days & WeekDays.Thursday) != 0; }
set { SetDaysFlag(WeekDays.Thursday, value); }
}
public bool Friday
{
get { return (Days & WeekDays.Friday) != 0; }
set { SetDaysFlag(WeekDays.Friday, value); }
}
public bool Saturday
{
get { return (Days & WeekDays.Saturday) != 0; }
set { SetDaysFlag(WeekDays.Saturday, value); }
}
public bool Sunday
{
get { return (Days & WeekDays.Sunday) != 0; }
set { SetDaysFlag(WeekDays.Sunday, value); }
}
/// <summary>
/// Set or unset the flag on the <c>Days</c> property.
/// </summary>
/// <param name="flag">The flag to set or unset.</param>
/// <param name="state">True when the flag should be set, or false when it should be removed.</param>
private void SetDaysFlag (WeekDays flag, bool state)
{
if (state)
Days |= flag;
else
Days &= ~flag;
}
}Stack Overflow用户
发布于 2015-07-16 21:43:29
最简单的方法之一是使用位-和(&)或使用Enum.HasFlags()来检查标志。我会展示这两种混合：
Week Bind(WeekDays days)
{
var w = new Week();
w.Monday = (days & WeekDays.Monday) == WeekDays.Monday;
w.Tuesday = days.HasFlag(WeekDays.Tuesday);
w.Wednesday = (days & WeekDays.Wednesday) == WeekDays.Wednesday;
w.Thursday = days.HasFlag(WeekDays.Thursday);
w.Friday = (days & WeekDays.Friday) == WeekDays.Friday;
w.Saturday = days.HasFlag(WeekDays.Saturday);
w.Sunday = days.HasFlag(WeekDays.Sunday);
return w;
}Stack Overflow用户
发布于 2015-07-16 21:58:45
[Flags]
public enum WeekDays
{
Monday = 1,
Tuesday = 2,
Wednesday = 4,
Thursday = 8,
Friday = 16,
Saturday = 32,
Sunday = 64
}
public class Week
{
public bool Monday { get; set; }
public bool Tuesday { get; set; }
public bool Wednesday { get; set; }
public bool Thursday { get; set; }
public bool Friday { get; set; }
public bool Saturday { get; set; }
public bool Sunday { get; set; }
public static explicit operator WeekDays(Week week)
{
var points = new[]
{
week.Monday,
week.Tuesday,
week.Wednesday,
week.Thursday,
week.Friday,
week.Saturday,
week.Sunday
};
WeekDays weekDays = 0;
for (var i = 0; i < points.Length; i++)
{
if (points[i])
{
weekDays = weekDays | (WeekDays)(1 << i);
}
}
return weekDays;
}
public static explicit operator Week(WeekDays weekDays)
{
return new Week
{
Monday = weekDays.HasFlag(WeekDays.Monday),
Tuesday = weekDays.HasFlag(WeekDays.Tuesday),
Wednesday = weekDays.HasFlag(WeekDays.Wednesday),
Thursday = weekDays.HasFlag(WeekDays.Thursday),
Friday = weekDays.HasFlag(WeekDays.Friday),
Saturday = weekDays.HasFlag(WeekDays.Saturday),
Sunday = weekDays.HasFlag(WeekDays.Sunday)
};
}
public override string ToString()
{
return String.Format("{0},{1},{2},{3},{4},{5},{6}", Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31464713
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