/// <summary>
/// Adiciona uma mensagem de valor requerido para o estado da model.
/// </summary>
/// <param name="controllerContext"></param>
/// <param name="modelState"></param>
/// <param name="modelStateKey"></param>
/// <param name="elementType"></param>
/// <param name="value"></param>
private static void AddValueRequiredMessageToModelState(System.Web.Mvc.ControllerContext controllerContext, System.Web.Mvc.ModelStateDictionary modelState, string modelStateKey, Type elementType, object value)
{
if (((value == null) && !TypeHelpers.TypeAllowsNullValue(elementType)) && modelState.IsValidField(modelStateKey))
{
modelState.AddModelError(modelStateKey, GetValueRequiredResource(controllerContext));
}
}