Question

I want to create a method that takes in an Enum type, and returns all it's members in an array, How to create such a function?

Take for example, I have these two enums:

public enum Family
{ 
   Brother,
   Sister,
   Father
}

public enum CarType
{ 
   Volkswagen,
   Ferrari,
   BMW
}

How to create a function GetEnumList so that it returns

  1. {Family.Brother, Family.Sister, Family.Father} for the first case.
  2. {CarType.Volkswagen, CarType.Ferrari, CarType.BMW} for the second case.

I tried :

private static List<T> GetEnumList<T>()
{
    var enumList = Enum.GetValues(typeof(T))
        .Cast<T>().ToList();
    return enumList;
}

But I got an InvalidOperationException:

System.InvalidOperationException : Late bound operations cannot be performed on types or methods for which ContainsGenericParameters is true. at System.Reflection.RuntimeMethodInfo.ThrowNoInvokeException() at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)

Edit: The above code is working fine-- the reason I got an exception was because profiler caused me the bug. Thank you all for your solutions.

Was it helpful?

Solution

Here is the full code:

    public enum Family
    {
        Brother,
        Sister,
        Father
    }

    public enum CarType
    {
        Volkswagen,
        Ferrari,
        BMW
    }


    static void Main(string[] args)
    {
        Console.WriteLine(GetEnumList<Family>());
        Console.WriteLine(GetEnumList<Family>().First());
        Console.ReadKey();
    }

    private static List<T> GetEnumList<T>()
    {
        T[] array = (T[])Enum.GetValues(typeof(T));
        List<T> list = new List<T>(array);
        return list;
    }

OTHER TIPS

(Family[])Enum.GetValues(typeof(Family))

Like this?

private static List<string> GetEnumList<T>()
{
    return Enum.GetNames( typeof( T ) )
           .Select(s => typeof(T).Name + "." + s).ToList();
}
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