Question

以下是我用于应用程序的Model类

 public class APIVesselFilter
    {
        [Required(ErrorMessage = "Vessel is required")]
        public Guid VesselID { get; set; }

        public Guid? AnchorageID { get; set; }

    }

以下是验证过滤器，它将检查ModelState是否有效，如果无效，我将发送错误消息。

 public class ValidateModelAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            if (actionContext.ModelState.IsValid == false)
            {
                List<string> errorList = new List<string>();
                foreach (var err in actionContext.ModelState.Values)
                {

                    foreach (var er in err.Errors)
                    {
                        errorList.Add(er.ErrorMessage);
                    }
                }
                actionContext.Response = actionContext.Request.CreateResponse(APIResponse.SendResponse(RequestStatus.GetValidationFailedMessage(), actionContext.ModelState));
            }
        }
    }

这里，以下是我使用上述模型状态得到的响应。在这里，错误消息不是用户可理解的方式，所以我在Vessel的Require属性中添加了ErrorMessage，我循环遍历ModelState中的错误。但我的错误消息始终为空（我使用调试器检查过）。我在这里缺少什么，以便错误消息将直接绑定到ModelState？

{
  "Status": {
    "StatusCode": 620,
    "StatusMessage": "Validation Failed"
  },
  "Data": {
    "filter": {
      "_errors": [
        {
          "<Exception>k__BackingField": {
            "ClassName": "Newtonsoft.Json.JsonSerializationException",
            "Message": "Required property 'VesselID' not found in JSON. Path '', line 1, position 56.",
            "Data": null,
            "InnerException": null,
            "HelpURL": null,
            "StackTraceString": "   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EndObject(Object newObject, JsonReader reader, JsonObjectContract contract, Int32 initialDepth, Dictionary`2 propertiesPresence)",
            "RemoteStackTraceString": null,
            "RemoteStackIndex": 0,
            "ExceptionMethod": "8\nEndObject\nNewtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed\nNewtonsoft.Json.Serialization.JsonSerializerInternalReader\nVoid EndObject(System.Object, Newtonsoft.Json.JsonReader, Newtonsoft.Json.Serialization.JsonObjectContract, Int32, System.Collections.Generic.Dictionary`2[Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.JsonSerializerInternalReader+PropertyPresence])",
            "HResult": -2146233088,
            "Source": "Newtonsoft.Json",
            "WatsonBuckets": null
          },
          "<ErrorMessage>k__BackingField": ""
        }
      ],
      "<Value>k__BackingField": null
    }
  }
}

Answer 1

尝试使用DisplayAttribute：

装饰您的模型属性

public class APIVesselFilter
{
    [Required]
    [Display(Name="Vessel is required")]
    public Guid VesselID { get; set; }

    public Guid? AnchorageID { get; set; }

}

我知道这是使用Html.ValidationSummary时自定义消息的方法，快速测试显示在操作中检查ModelState时会出现这种情况。

Answer 2

使用CreateErrorResponse而不是CreateResponse可能会解决您的问题。我遇到了一个熟悉的问题并且已经解决了。在你的情况下，这将是

actionContext.Response = actionContext.Request.CreateErrorResponse(APIResponse.SendResponse(RequestStatus.GetValidationFailedMessage(), actionContext.ModelState));

Web API中的ModelState Errormessage为Empty

2 个答案: