CODEWITHSUNDEEP
c#asp.netasp.net-mvcerror-handling
rld001
rld001

Reputation: 153

How to return an error code with ValidationResult asp .net

I need to differentiate between errors in my front end by sending back an error code from the validation.

Currently errors will just send back the string errorMessage, from something like

return new ValidationResult("Some error message").

Can i somehow send back an error code, using an enum of error types for me to check in front end?

Theoretical Example:

return new ValidationResult("Some default error message", MyErrorEnum.notEnoughCats)

Upvotes: 0

Views: 1500

Answers (2)

Han solo
Han solo

Reputation: 44

i use this way if ajax + json

private string RenderRazorViewToString(string viewName, object model, Dictionary<string, object> oDicParametresViewData = null, string sHtmlFieldPrefix = "")
    {
        ViewData.Model = model;
        if (oDicParametresViewData != null) foreach (var param in oDicParametresViewData) ViewData[param.Key] = param.Value;
        if (sHtmlFieldPrefix != "") ViewData.TemplateInfo = new System.Web.Mvc.TemplateInfo { HtmlFieldPrefix = sHtmlFieldPrefix };
        using (var sw = new StringWriter())
        {
            var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
            var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
            viewResult.View.Render(viewContext, sw);
            viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
            return sw.GetStringBuilder().ToString();
        }
    }

 Response.StatusCode = 666;

 return Json(new
        {
            Html = RenderRazorViewToString("view", model),            
        });

who call your validation result ? you can also return a partial view ?

Upvotes: 1

Virus Best
Virus Best

Reputation: 26

it's easy. only it is better to use constants as digits. You need:

  /// <summary>
/// 
/// </summary>
public class NotFoundException : Exception
{
    /// <summary>
    /// Сообщение об ошибке
    /// </summary>
    /// <param name="message"></param>
    public NotFoundException(string message, int? codeAction=null) : base(message)
    {
        CodeAction = codeAction;
    }

    public int? CodeAction { get; set; }
}

when intercept an error : 

 public class ErrorsFilterAttribute : ExceptionFilterAttribute, IAutofacExceptionFilter
{
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{  
       var errorMessage = new ErrorMessage(actionExecutedContext.Exception.Message, HttpStatusCode.InternalServerError); 
       if (actionExecutedContext.Exception is NotFoundException)
        {
            errorMessage.ErrorCode = (int)HttpStatusCode.NotFound;
            isWarning = true;
            errorMessage.CodeAction = ((NotFoundException) actionExecutedContext.Exception).CodeAction; 
        }
          actionExecutedContext.Response = actionExecutedContext.Request.CreateResponse((HttpStatusCode)errorMessage.ErrorCode, errorMessage);
}
}

errorMessage it's my return class 

  /// <summary>
    /// HTTP Code
    /// </summary>
    public int ErrorCode { get; set; }
    /// <summary>
    /// коде ошибки внутри сервиса
    /// </summary>
    public int? CodeAction { get; set; }

simple errors 

{  "errorCode": 400,  "codeAction": 2,  "errors": {
"error": "bad values!"  }}

Upvotes: 1

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