Returning Bad Request (HTTP 400) errors on incorrect data types WCF Web API

Question

I have a WCF Web API. Some endpoints accept DataContracts which obviously contain different properties and datatypes. If a request contains a property with an incorrect data type (ie A string in an integer property) the value comes through as null after being serialized. Is there a simple way to instead, throw back a HTTP 400 Bad Request response (and possibly the offending property).

Thanks

Answer 1

There are several ways :

if(param == null){
    throw new HttpException(400, "Bad Request, param is invalid");
    //or 
    return new HttpStatusCodeResult(HttpStatusCode.BadRequest, "Bad Request, param is invalid");
}