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c#inheritanceenumsabstract-class
Marshall
Marshall

Reputation: 1362

How to refer to an enum in the actual class rather than the base class in C#

I am having trouble with this, as I have difficulty properly formulating it too. Making it harder to google it. I will try to explain as clearly as possible. I've simplified the code to make it clearer what my question is

I have an abstract class that has methods and properties that are used by all clases that have this as base class:

public abstract class TheBaseClass{

    //some properties here

    public enum MyEnum{} // this one every class has. It is pretty much empty here. Not sure if this is best practice.

    //some methods here
}

Then there are a number of classes based on this:

public SpecializedClass : TheBaseClass{

    //some more properties here

    public new enum MyEnum{} //every single class has a different enum

    //some more methods here
}

Now, somewhere else in the code, I have a method

public void MyMethod(TheBaseClass baseclassobject){

    //do stuff
    var usedforsomething = ((TheBaseClass.MyEnum)i).ToString() //i being an int. This is used to name something in a plot.
    //do more stuff
}

The reason for using TheBaseClass as a parameter for the method, is that before I had very long code that did what mymethod did for each class derived from TheBaseClass. It is not good to have duplicate code, so I made this method instead and wanted to call it with the parameter SpecializedClass (and many other classes like that also). The problem is that when calling TheBaseClass.MyEnum I naturally get the enum for the BaseClass, not the one from SpecializedClass. I have been experimenting with how to get the right enum in the method regardless of what baseclassobject I give it, but can't seem to find the solution.

How can I get the enum of whatever class baseclassobject is? I have tried some different things, but don't seem to work. The problem I think is that the enum is not a property or method that I can call from the object, but rather need to call ClassName.MyEnum, which I don't have the className in the method.

A solution could be to create a method for each class type, with that specific class type as parameter, but that seems like a lot of duplicate code.

For example if I have 50 different derived classes like SpecializedClass

Upvotes: 6

Views: 251

Answers (2)

Magnus
Magnus

Reputation: 46947

I think reflection would be you only option here.

var usedforsomething = 
      baseclassobject
       .GetType()
       .GetNestedType(nameof(TheBaseClass.MyEnum))
       .GetEnumName(i);

But perhaps a better solution would be to add an abstract function GetName in your base class that your child classes must override.

public abstract class TheBaseClass
{

    public enum MyEnum {a,b }

    public abstract string GetName(int value);
}

public class SpecializedClass : TheBaseClass
{

    public new enum MyEnum {c,d }

    public override string GetName(int value)
    {
        return ((MyEnum)value).ToString();
    }
}

You could than do:

var usedforsomething = baseclassobject.GetName(i);

You can than avoid reflection and also the dependence on the child classes declaring the enum with the specific name MyEnum.

Upvotes: 5

KozhevnikovDmitry
KozhevnikovDmitry

Reputation: 1720

May I understood you incorrectly, but did you try to do little reflection stuff in MyMethod to take necessary enum type:

public static void MyMethod(TheBaseClass baseclassobject)
{
    Type enumType = baseclassobject.GetType().GetNestedType("MyEnum");
    var usedforsomething = Enum.GetName(enumType, 1);
    Console.WriteLine(usedforsomething);
}

Upvotes: -1

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