How do I compare object and integer values converting both to Enum?

Question

Why does the following return false? The value object is of type SomeEnum at runtime.

I'm converting both the object to same type, however I still receive it as false.

What am I doing wrong?

object value = SomeEnum.FirstValue;
object parameter = 0;
Console.Write(Enum.ToObject(value.GetType(), parameter ?? 0) == Enum.Parse(value.GetType(), value.ToString()));

The problem is I cannot directly acess the SomeEnum type and I receive everything as object.

See my answer and try the line of code I posted.

Jonathan Alfaro
– Jonathan Alfaro

2019-03-25 04:22:42 +00:00
Commented Mar 25, 2019 at 4:22 — Jonathan Alfaro
– Jonathan Alfaro, Commented Mar 25, 2019 at 4:22

Jonathan Alfaro · Accepted Answer · 2019-03-25 04:24:19Z

4

Because you are comparing object instances; not Enum Values.

You need to convert both to enum and then compare. Or use the Object.Equals method.

Because when you box them inside an object they become different instances.

Try this instead:

 Enum.ToObject(value.GetType(), parameter ?? 0).Equals(Enum.Parse(value.GetType(), value.ToString()))

edited Mar 25, 2019 at 4:24

answered Mar 25, 2019 at 4:18

Jonathan Alfaro

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6 Comments

ANewGuyInTown Over a year ago

Great. Actually that's what I did and it worked before I found your answer :) Thanks anyway.

Jonathan Alfaro Over a year ago

@ZammyPage if my answer works please mark as answered for any one else searching google.

ANewGuyInTown Over a year ago

You need to convert both to enum and then compare. I suppose that's what it does when I use Enum.ToObject and Enum.Parse. They should both convert them to enum value types?

Jonathan Alfaro Over a year ago

@ZammyPage Enum.ToObject does the opposite it converts to an object. Enum.Parse also converts to an object. In order for Enum.Parse to work you need to cast the result to an enum like this (someenum)Enum.Parse(somestring)

ANewGuyInTown Over a year ago

Yeah, make sense. Thanks mate.

|

Dave Anderson · Accepted Answer · 2019-03-25 04:19:49Z

0

It's possible to assign different integers to Enum values, they are not necessarily zero indexed.

Enumeration types C#

enum Day { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday,
Saturday };

When you create a new Day object, it will have a default value of Day.Sunday (0) if you do not explicitly assign it a value.

When you do not specify values for the elements in the enumerator list, the values are automatically incremented by 1.

enum MachineState
{
    PowerOff = 0,
    Running = 5,
    Sleeping = 10,
    Hibernating = Sleeping + 5
}

You can assign any values to the elements in the enumerator list of an enumeration type, and you can also use computed values:

answered Mar 25, 2019 at 4:19

Dave Anderson

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2 Comments

Jonathan Alfaro Over a year ago

That is not the reason. He is comparing instances and not values. See my answer. Just try the code and see that both objects have the same enum value

Dave Anderson Over a year ago

@Darkonekt yes, you got my upvote. Seemed an odd way to go about comparing enum values.

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