How to prevent duplicate values in enum?

Question

I wonder is there a way to prevent an enum with duplicate keys to compile?

For instance this enum below will compile

public         


        

Answer 1

Unit test that checks enum and shows which particular enum values has duplicates:

[Fact]
public void MyEnumTest()
{
    var values = (MyEnum[])Enum.GetValues(typeof(MyEnum));
    var duplicateValues = values.GroupBy(x => x).Where(g => g.Count() > 1).Select(g => g.Key).ToArray();
    Assert.True(duplicateValues.Length == 0, "MyEnum has duplicate values for: " + string.Join(", ", duplicateValues));
}