Question

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How to enumerate an enum?

Suppose that i have an enumeration like that:

public enum Cars
{
    Audi = 0,
    BMW,
    Opel,
    Renault,
    Fiat,
    Citroen,
    AlfaRomeo,
}

Do i have a chance to iterate between Opel and Citroen? I want to give these values as parameters of a method.

Answer 1

This will work:

for(Cars car=Cars.Opel; car<=Cars.Citroen; car++)
{
  Console.WriteLine(car);
}

but you have to make sure that the start value is less than the end value.

EDIT
If you don’t hardcode the start and end, but supply them as parameters, you need to use them in the correct order. If you just switch “Opel” and “Citroen”, you will get no output.

Also (as remarked in the comments) the underlying integer values must not contain gaps or overlaps. Luckily if you do not specify values yourself (even the ‘=0’ is not needed), this will be the default behaviour. See MSDN:

When you do not specify values for the elements in the enumerator list, the values are automatically incremented by 1.