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Why does this return False
public enum Directions { Up, Down, Left, Right }
static void Main(string[] args)
{
bool matches = IsOneOf(Directions.Right, Directions.Left, Directions.Right);
Console.WriteLine(matches);
Console.Read();
}
public static bool IsOneOf(Enum self, params Enum[] values)
{
foreach (var value in values)
if (self == value)
return true;
return false;
}
while this returns True?
public static bool IsOneOf(Enum self, params Enum[] values)
{
foreach (var value in values)
if (self.Equals(value))
return true;
return false;
}
397
In C#, an enum (or enumeration type) is used to assign constant names to a group of numeric integer values. It makes constant values more readable, for example, WeekDays. Monday is more readable then number 0 when referring to the day in a week.
An enumeration type (or enum type) is a value type defined by a set of named constants of the underlying integral numeric type. To define an enumeration type, use the enum keyword and specify the names of enum members: C# Copy. enum Season { Spring, Summer, Autumn, Winter }
Enumeration (or enum) is a value data type in C#. It is mainly used to assign the names or string values to integral constants, that make a program easy to read and maintain.
The default value for an enum is zero.
Enum does not implement a == equality operator but it does override the Equals method.
Since it does not implement ==, the system performs a reference equality check. Note that System.Enum is a class not a structure. Hence, values such as Directions.Left are boxed. In this particular case, the boxed objects end up being separate objects, hence they fail a reference equality test.
The compiler understands == for concrete Enum types (such as Directions), but the compiler does not do this special processing against the System.Enum type.
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