Ndtyjky

I would like the following Post method to return a failure by assigning a failure value to the "result" variable but I am not sure how to achieve that. Ideally it would say that the installation id is invalid, but not sure I could do that:

[Authorize]

[HttpPost, Route("sendForDevelopment")]

public async Task<NotificationOutcome> Post([FromBody]string message, string installationId)

{



    string hubName = "myHubName";

    string hubNameDefaultShared = "myHubNameDefaultShared";



    NotificationHubClient hub = NotificationHubClient

                    .CreateClientFromConnectionString(hubNameDefaultShared, hubName, enableTestSend: true);



    var templateParams = new Dictionary<string, string>

    {

        ["messageParam"] = message

    };



    NotificationOutcome result = null;



    if (string.IsNullOrWhiteSpace(installationId))

    {

        // output a installation id is null or empty message or assign failure to the result variable

    }

    else

    {

        result = await hub.SendTemplateNotificationAsync(templateParams, "$InstallationId:{" + installationId + "}").ConfigureAwait(false);

    }



    return result;

}

Have the result of the action be a IHttpActionResult derived object.

That should allow greater flexibility as to what you can return when the request is not valid

For example

[Authorize]

[HttpPost, Route("sendForDevelopment")]

public async Task<IHttpActionResult> Post([FromBody]string message, string installationId) {



    if (string.IsNullOrWhiteSpace(installationId)) {

        var model = new {

            error = new {

                code = 400,

                message = "installation id is null or empty"

            }

        }

        return Content(HttpStatusCode.Badrequest, model); //400 Bad Request with error message

    }



    string hubName = "myHubName";

    string hubNameDefaultShared = "myHubNameDefaultShared";



    var hub = NotificationHubClient

                    .CreateClientFromConnectionString(hubNameDefaultShared, hubName, enableTestSend: true);



    var templateParams = new Dictionary<string, string>

    {

        ["messageParam"] = message

    };



    NotificationOutcome result = await hub.SendTemplateNotificationAsync(templateParams, "$InstallationId:{" + installationId + "}").ConfigureAwait(false);

    return Ok(result); //200 OK with model result

}

For a bad request the response body would look something like

{

  "error": {

    "code": 400,

    "message": "installation id is null or empty"

  }

}

On the client side you check the status code of the response and proceed accordingly.

var response = await client.PostAsync(url, content);

if(response.IsSuccessStatusCode)

    var result = await response.Content.ReadAsAsync<NotificationOutcomeResult>();



    //...

else {

    //...check why request failed.

    var model = await response.Content.ReadAsAsync<ErrorResponse>();



    var message = model.error.message;



    //...

}



//...