WCF: Exposing readonly DataMember properties without set?

I have a server side class which I make available on the client side through a [DataContract]. This class has a readonly field which I'd like to make available through a property. However, I'm unable to do so because it doesn't seem that I'm allowed to add a [DataMember] property without having both get and set.

So - is there a way to have a [DataMember] property without setter?

[DataContract]
class SomeClass
{
    private readonly int _id; 

    public SomeClass() { .. }

    [DataMember]
    public int Id { get { return _id; } }        

    [DataMember]
    public string SomeString { get; set; }
}

Or will the solution be use the [DataMember] as the field - (like e.g. shown here)? Tried doing this too, but it doesn't seem to care the field is readonly..?

Edit: Is the only way to make a readonly property by hacking it like this? (no - I don't want to do this...)

[DataMember]
public int Id
{
    get { return _id; }
    private set { /* NOOP */ }
}