ASP.NET MVC Empty Body Filter

ValidateModelAttribute.cs

namespace Application.Infrastructures.Filters
{
    public class ValidateModelAttribute : ActionFilterAttribute
    {
        private readonly ConcurrentDictionary<string, IList<string>> _bodyParameters = new ConcurrentDictionary<string, IList<string>>();

        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            base.OnActionExecuting(actionContext);
            var request = actionContext.Request;
            var arguments = actionContext.ActionArguments;
            var bodyParameter = _bodyParameters.GetOrAdd(
                ((ReflectedHttpActionDescriptor) actionContext.ActionDescriptor).MethodInfo.ToString(), // this is full name for method (example: Namespace.ReturnType Namespace.Controller.ActionMethod(Namespace.SomeDto parameterName))
                _ => actionContext.ActionDescriptor
                    .GetParameters()
                    .Where(p => p.GetCustomAttributes<FromBodyAttribute>().Any())
                    .Select(p => p.ParameterName)
                    .ToList());

            if (bodyParameter.Any(name => arguments.ContainsKey(name) && arguments[name] == null))
            {
                actionContext.Response = request.CreateErrorResponse(HttpStatusCode.BadRequest, "Request body is empty.");
                return;
            }

            if (!actionContext.ModelState.IsValid)
            {
                actionContext.Response = request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
            }
        }
    }
}