A filter for ASP.NET Web API to return 400 upon invalid model binding

InvalidModelStateFilterAttribute.cs

using System;
using System.Net;
using System.Net.Http;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class InvalidModelStateFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (!actionContext.ModelState.IsValid)
            actionContext.Response = actionContext.Request.CreateErrorResponse(
                HttpStatusCode.BadRequest,
                actionContext.ModelState
            );
        else
            base.OnActionExecuting(actionContext);
    }
}