public class ModelStateFilter : IActionFilter

    {

        public void OnActionExecuting(ActionExecutingContext context)

        {

            ModelStateDictionary modelState = context.ModelState;

            if (!modelState.IsValid)

            {

                context.Result = new BadRequestObjectResult(modelState);

            }

        }

        public void OnActionExecuted(ActionExecutedContext context)

        {

        }

    }

    /// <summary>

    /// 简化模型验证 modelState.IsValid不用每一个写

    /// </summary>

    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true)]

    public class ModelValidationAttribute : ActionFilterAttribute

    {

        public override void OnActionExecuting(ActionExecutingContext context)

        {

            ModelStateDictionary modelState = context.ModelState;

            if (!modelState.IsValid)

            {

                context.Result = new BadRequestObjectResult(modelState);

            }

        }

    }