How to get lowercase hyphen naming convention of serialized POCO classes without DataMember attributes?

I have a very large set of POCO classes used as data contracts in WCF and model classes in Web API and I need to serialize them using lowercase hyphen convention. Using DataMember attribute one each property rings my DRY alarms.

class BankAccount{
   public string AccountNumber;
}

Should be serialized as following XML:

<bank-account>
   <account-number>CA123A1231</account-number>
</bank-account>

and as a following JSON:

{
  "account-number":"CA123A1231"
}

I am aware of CamelCasePropertyNamesContractResolver in Json.NET so I guess I could use it as a starting point for JSON.

Any ideas on how to implement naming convention for XML using DataContractSerializer?