webapi输入验证过滤器ValidationActionFilter

public class validationActionFilter:ActionFilterAttribute     {         public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)         {             var modelState = actionContext.ModelState;             if(!modelState.IsValid)             {                 dynamic errors = new JObject ( );                 foreach(var key in modelState.Keys)                 {                     var state = modelState[key];                     if(state.Errors.Any ( ))                     {                         errors[key] = state.Errors.First ( ).ErrorMessage;                     }                 }                 actionContext.Response = new HttpResponseMessage ( HttpStatusCode.BadRequest )                 {                     Content = new StringContent ( Convert.ToString ( errors ) )                 };             }          }      }

public class ValidationActionFilter : ActionFilterAttribute     {         public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)         {             var modelState = actionContext.ModelState;             if (!modelState.IsValid)             {                 ApiResult result = new ApiResult();                 result.code = ApiResultCode.fail;                 result.msg = "输入数据验证失败";                 //找到出错的字段以及出错信息                 var errorFieldsAndMsgs = modelState.Where(m => m.Value.Errors.Any())                     .Select(x => new { x.Key, x.Value.Errors });                 result.desc = string.Join(",", errorFieldsAndMsgs.SelectMany(p => p.Errors.Select(t => t.ErrorMessage)).ToArray());                  actionContext.Response = new HttpResponseMessage(HttpStatusCode.BadRequest)                 {                     Content = new StringContent(JsonConvert.SerializeObject(result))                 };             }          }

public class ValidationActionFilter : ActionFilterAttribute     {         public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)         {             var modelState = actionContext.ModelState;             if (!modelState.IsValid)             {                 ApiResult result = new ApiResult();                 result.code = ApiResultCode.fail;                 result.msg = "输入数据验证失败";                 //找到出错的字段以及出错信息                 var errorFieldsAndMsgs = modelState.Where(m => m.Value.Errors.Any())                     .Select(x => new { x.Key, x.Value.Errors });                 result.desc = string.Join(",", errorFieldsAndMsgs.SelectMany(p => p.Errors.Select(t => t.ErrorMessage)).ToArray());                  actionContext.Response = new HttpResponseMessage(HttpStatusCode.BadRequest)                 {                     Content = new StringContent(JsonConvert.SerializeObject(result))                 };             }          }

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