Xamarin RestSharp: Json object send to Azure Web API with result null response

Question

I am using RestSharp on Xamarin to communicate with WebAPI using POST. I can send something and get a response but the outcome wasn't what I expected.

This is my code on Xamarin.

                var request = new RestSharp.RestRequest ("api/device/stats", RestSharp.Method.POST);
            request.AddHeader ("Content-Type", "application/json; charset=utf-8");

            request.RequestFormat = DataFormat.Json;
            request.AddBody(new AppUsageInfo {MAC = "ASDF"}); 
            RestSharp.IRestResponse response = client.Execute (request);
            var content = response.Content;

On my WebAPI :

 public string Post([FromUri]UsageLogModel usageState)
    {
        //LogFunction.AddUsageLogs(usageState);
        if (usageState.MAC == null)
            return "fail";
        else
            return "success";
    }

UsageLogModel is :

public class UsageLogModel
{
    public string MAC;
}

Somehow the response is "Fail" which MAC is null. I scratched my head but have no idea what is going on.-

The type used in rest request AppUsageInfois different from the one you're expecting in you post method UsageLogModel — Milen
– Milen, Commented Apr 29, 2016 at 12:11

DavidS · Accepted Answer · 2016-05-01 05:01:56Z

2

Your Xamarin code is putting the MAC content in the body of the request (which is probably appropriate for a POST), but the Web API is expected the parameter to be in the query string (that's what the [FromUri] attribute is doing). Try changing the Web API method to:

public string Post([FromBody]UsageLogModel usageState)

answered May 1, 2016 at 5:01

DavidS

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