c# Enum Function Parameters

Question

As a follow on from this question.

How can I call a function and pass in an Enum?

For example I have the following code:

enum e1
{
    //...
}

public void test()
{
    myFunc( e1 );
}

public void myFunc( Enum e )
{
    var names = Enum.GetNames(e.GetType());

    foreach (var name in names)
    {
        // do something!
    }

}

Although when I do this I am getting the 'e1' is a 'type' but is used like a 'variable' Error message. Any ideas to help?

I am trying to keep the function generic to work on any Enum not just a specific type? Is this even possible?... How about using a generic function? would this work?

Answer 1

You can use a generic function:

    public void myFunc<T>()
    {
        var names = Enum.GetNames(typeof(T));

        foreach (var name in names)
        {
            // do something!
        }
    }

and call like:

    myFunc<e1>();

(EDIT)

The compiler complains if you try to constraint T to Enum or enum.

So, to ensure type safety, you can change your function to:

    public static void myFunc<T>()
    {
        Type t = typeof(T);
        if (!t.IsEnum)
            throw new InvalidOperationException("Type is not Enum");

        var names = Enum.GetNames(t);
        foreach (var name in names)
        {
            // do something!
        }
    }