静态枚举类成员

Question

Can I declare my enum as a static member inside another class? I want only one instance from this enum

public enum MyEnum 
{
    Add,
    Remove
}

public class MyClass 
{
    private static MyEnum _myEnum;


    public MyEnum Enum
    {
        get { return _myEnum; }
        set { _myEnum = value; }
    }
}

Is it Ok to do that?

Answer 1

I would strongly suggest to make also the property static since it's pointless to get/set a static field from a non-static property.

That's not only confusing. I would call that begging for bugs.

Consider this:

var c1 = new MyClass { Enum = MyEnum.Add };
var c2 = new MyClass { Enum = MyEnum.Add };
c2.Enum = MyEnum.Remove;
Console.Write(c1.Enum.ToString());

What do you expect as output? Both instances now have MyEnum.Remove even if i only set one.

If you make it static above would not even compile which is a good thing.

You would need to use the property via classname which shows clearly that it`sa static property:

MyClass.Enum = MyEnum.Remove;

Answer 2

Define your property as static too

public static MyEnum Enum
{
    get { return _myEnum; }
    set { _myEnum = value; }
}

Answer 3

It is totally okey asuming you will only access it through created MyClass objects. If you want to be able to set or get Enum without an instantiated object, IE make Enum a singleton just as _myEnum, you should declare it static.