Handling WebApi Error HttpResponseMessage client side

Question

I'm having issues dealing with a http error response from webapi when there are ModelState errors, namely the fact that 'ModelState' isn't a collection but properties so I can't loop through them.

I'm struggling to find any information on how others are dealing with this, it must be a common use case?

Controller

if (!ModelState.IsValid)
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);

Resulting JSON

{  
    "readyState":4,
    "responseText":"{\"Message\":\"The request is invalid.\",\"ModelState\":{\"model.Property1\":[\"'Property1' should not be empty.\"],\"model.Property2\":[\"'Property2' should not be empty.\"],\"model.Property3\":[\"'Property3' should not be empty.\"]}}",
    "responseJSON":{  
      "Message":"The request is invalid.",
      "ModelState":{  
         "model.Property1":[  
            "'Property1' should not be empty."
         ],
         "model.Property2":[  
            "'Property2' should not be empty."
         ],
         "model.Property3":[  
            "'Property3' should not be empty."
         ]
      }
    },
    "status":400,
    "statusText":"Bad Request"
}

Asif Raza · Accepted Answer · 2017-05-10 11:02:36Z

1

In my case i'm using

HttpResponseMessage response = null;
if (!ModelState.IsValid)
            {
                response = request.CreateResponse(HttpStatusCode.BadRequest,
                    ModelState.Keys.SelectMany(k => ModelState[k].Errors)
                          .Select(m => m.ErrorMessage).ToArray());
            }

then return the response

answered May 10, 2017 at 11:02

Asif Raza

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1 Comment

Tom Riley Over a year ago

Ideally I would have liked to have kept using CreateErrorResponse and dealt with it in the client. However this is what I'm going to go with for now so I'll accept.

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