我可以将c#enum
声明为bool
,如:
enum Result : bool
{
pass = true,
fail = false
}
答案 0 :(得分:22)
答案 1 :(得分:19)
如果你需要你的枚举除了枚举常量的类型值之外还包含布尔数据,你可以为你的枚举添加一个简单的属性,取一个布尔值。然后,您可以为枚举添加一个扩展方法,该方法获取属性并返回其布尔值。
public class MyBoolAttribute: Attribute
{
public MyBoolAttribute(bool val)
{
Passed = val;
}
public bool Passed
{
get;
set;
}
}
public enum MyEnum
{
[MyBoolAttribute(true)]
Passed,
[MyBoolAttribute(false)]
Failed,
[MyBoolAttribute(true)]
PassedUnderCertainCondition,
... and other enum values
}
/* the extension method */
public static bool DidPass(this Enum en)
{
MyBoolAttribute attrib = GetAttribute<MyBoolAttribute>(en);
return attrib.Passed;
}
/* general helper method to get attributes of enums */
public static T GetAttribute<T>(Enum en) where T : Attribute
{
Type type = en.GetType();
MemberInfo[] memInfo = type.GetMember(en.ToString());
if (memInfo != null && memInfo.Length > 0)
{
object[] attrs = memInfo[0].GetCustomAttributes(typeof(T),
false);
if (attrs != null && attrs.Length > 0)
return ((T)attrs[0]);
}
return null;
}
答案 2 :(得分:7)
怎么样:
class Result
{
private Result()
{
}
public static Result OK = new Result();
public static Result Error = new Result();
public static implicit operator bool(Result result)
{
return result == OK;
}
public static implicit operator Result( bool b)
{
return b ? OK : Error;
}
}
例如,您可以像Enum或bool一样使用它 var x = Result.OK; 结果y = true; 如果(x)...... 要么 如果(Y == Result.OK)