c# - WebApi2 OData return custom error object -

i've searched intensive can't work.

i've haven web ap2 odata api , need return custom error class.

here have:

public class error {     public string code { get; set; }     public string message { get; set; } } 

in global.asax.cs

protected void application_start()     {         globalconfiguration.configure(webapiconfig.register);                      globalconfiguration.configuration.messagehandlers.add(new messageinterceptor());     }    public class messageinterceptor : delegatinghandler {     protected override task<httpresponsemessage> sendasync(httprequestmessage request, cancellationtoken cancellationtoken)     {          return base.sendasync(request, cancellationtoken).continuewith(                     task =>                     {                         var body = task.result.content.readasstringasync().result;                         var resultobj = jsonconvert.deserializeobject(body.replace("value", "results"));                                                     task.result.content = new objectcontent(typeof(object), resultobj, new jsonmediatypeformatter());                         return task.result;                     }, cancellationtoken);     } } 

in webapiconfig,cs

 public static class webapiconfig {     public static void register(httpconfiguration config)     {   config.filters.add(new  handleapiexceptionattribute());  }  }  public class handleapiexceptionattribute : exceptionfilterattribute, iexceptionfilter {     public override void onexception(httpactionexecutedcontext context)     {         if (context.exception error)         {             var res = context.exception.message;              //define response message             httpresponsemessage response = new httpresponsemessage(httpstatuscode.internalservererror)             {                 content = new stringcontent(res),                 reasonphrase = res             };              //create error response             context.response = response;         }     }    public class orderscontroller : odatacontrollera controller {     private context db = new context();      // get: odata/orders     [queryable]     public iqueryable<orders> getorders(odataqueryoptions<orders> opts)  {  <some code producing error>  error theerror = new error()         {             code = "1000",             message = "geen filter gespecificeerd"         };          httpresponsemessage response = request.createresponse(httpstatuscode.badrequest, theerror);         //return request.createresponse(httpstatuscode.badrequest, theerror);         throw new httpresponseexception(response); 

}

when try this crashes in messageinterceptor.

this there because third party consuming api want's in specific format.

when code runs correct returns results{}

on error should return error{code:, message: }

anyone ideas?

jeroen

this came with:

i changed controller to:

 [queryable, basicauthentication]     public ihttpactionresult getorders(odataqueryoptions<orders> opts)     {         else         {                   error theerror = new error()             {                 code = "1000",                 message = "geen filter gespecificeerd"             };              return new errorresult(theerror, request);          }          return ok(resultlist);     } 

using class:

public class errorresult : ihttpactionresult {     error _error;     httprequestmessage _request;      public errorresult(error error, httprequestmessage request)     {         _error = error;         _request = request;     }      public task<httpresponsemessage> executeasync(cancellationtoken cancellationtoken)     {                      list<error> _errorlist = new list<error>();         _errorlist.add(_error);          error err = new error()         {             errors = _errorlist         };          var response = new httpresponsemessage(httpstatuscode.badrequest)         {             content = new objectcontent<error>(err, new jsonmediatypeformatter()),             requestmessage = _request         };         return task.fromresult(response);     } }  public class error  {     public string code { get; set; }     public string message { get; set; } }  public class error {     public list<error> errors { get; set; } }