当使用基本类型 uint 声明枚举时,当您确切知道要转换的项目时,可以将其强制转换为 int。但是,当您有一个 Dictionary 并从中检索其中一个枚举项时,您无法执行此转换。
为什么会这样?
例如:
枚举:
public enum IncrementScheduleMask
{
Sunday = 0x01,
Monday = 0x02,
Tuesday = 0x04,
Wednesday = 0x08,
Thursday = 0x10,
Friday = 0x20,
Saturday = 0x40,
}
这将起作用:
bool Sun = true;
ulong weeklyMask = 0;
if (Sun)
weeklyMask |= (int)IncrementScheduleMask.Sunday;
但这不会:
public static List<string> DaysOfTheWeek = new List<string>{
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
public static Dictionary<string, IncrementScheduleMask> DaysOfTheWeekMasks = new Dictionary<string, IncrementScheduleMask>()
{
{ "Sun", IncrementScheduleMask.Sunday },
{ "Mon", IncrementScheduleMask.Monday },
{ "Tue", IncrementScheduleMask.Tuesday },
{ "Wed", IncrementScheduleMask.Wednesday },
{ "Thu", IncrementScheduleMask.Thursday },
{ "Fri", IncrementScheduleMask.Friday },
{ "Sat", IncrementScheduleMask.Saturday }
};
ulong weeklyMask = 0;
Action<string> _CompileWeekDays = new Action<string>(dayName =>
{
IncrementScheduleMask iMask = DaysOfTheWeekMasks[dayName];
weeklyMask |= (int)iMask;
});
DaysOfTheWeek.ForEach(_CompileWeekDays);
我已经提出了另一种解决方案,但我想知道为什么一个有效,而另一个无效。如果你不应该像这样施放,那这两种方式不应该一样吗?