webapi 传入参数校验

    /// <summary>
    /// 传入参数校验过滤器
    /// </summary>
    public class ValidateReqModelFilter : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            if (!actionContext.ModelState.IsValid)
            {
                actionContext.Response = actionContext.Request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
　　　　　　　　　 ////如果要自定义返回
            　　 //actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, new ResponseMessage() { Msg = false, Message = error });
　　　　　　　}
        }
    }

　　[ValidateReqModelFilter]
    public class TestController : ControllerEduBase
    {
            /// <summary>
            /// 测试
            /// </summary>
            [HttpPost]
            [Route("api/Test/saveSchool")]
            public JsonResult<ResponseMessage> Test(ReqTest req){
　　　　　　　　　　var result = new object();
　　　　　　　　　　return Json(result);
            }
 } 

public class ReqSaveSchool
    {
        /// <summary>
        /// token
        /// </summary>
        [Required(AllowEmptyStrings = false, ErrorMessage = "Token is validate")]
        public string Token { get; set; }

        /// <summary>
        /// id
        /// </summary>
        [RegularExpression(@"^[0-9]\d*$",ErrorMessage = "Id is validate")]
        public int Id { get; set; }

        /// <summary>
        /// 名称
        /// </summary>
        [Required]
        [StringLength(50,ErrorMessage = "Name is exceeding the length limit")]
        public string Name { get; set; }
    }

测试结果：如果输入参数校验失败，不会进入controller，直接返回错误信息。