如何从int输入中获取枚举值? 假设我在下面有这个枚举。
[Flags]
public enum Weeks
{
Sunday = 1,
Monday = 2,
Tuesday = 4,
Wednesday = 8,
Thursday = 16,
Friday = 32,
Saturday = 64
}
public List<Weeks> GetEnumValues(int input)
{
// Don't know what is the logic here
// Help is much appreciated
}
然后输出如下
Examples:
1.) input = 3; This means Sunday and Monday hence 1 + 2 = 3; This should return List<Weeks> { Sunday, Monday }
2.) input = 20; This means Tuesday and Thursday hence 4 + 16 = 20; This should return List<Weeks> { Tuesday, Thursday }
3.) input = 40; This means Wednesday and Friday hence 8 + 32 = 40; This should return List<Weeks> { Wednesday, Friday }
提前谢谢。
答案 0 :(得分:4)
如果在输入值中设置了该位,则可以通过循环每个枚举“flag”并检查每个“flag”来执行此操作。这是一种方法:
public List<Weeks> GetEnumValues(int input)
{
Weeks inputEnum = (Weeks)input;
var list = new List<Weeks>();
foreach(var enumFlag in Enum.GetValues(typeof(Weeks)).Cast<Weeks>())
{
if (inputEnum.HasFlag(enumFlag))
{
list.Add(enumFlag);
}
}
return list;
}
答案 1 :(得分:1)
public List<Weeks> GetEnumValues(int input)
{
Weeks inputEnum = (Weeks)input;
return Enum.GetValues(typeof(Weeks)).Cast<Weeks>().Where(x => inputEnum.HasFlag(x)).ToList();
}
答案 2 :(得分:0)
另一种方法 - 利用Flags枚举上的ToString这一事实构建了一个以逗号分隔的值列表。然后我们可以接受并通过Enum.Parse将每个元素转换回枚举值:
public List<Weeks> GetEnumValues(int input)
{
return ((Weeks)input)
.ToString()
.Split(',')
.Select(day => Enum.Parse(typeof(Weeks), day))
.ToList();
}
选择是你的......