Various errors using VisionServiceClient in XamarinForms

Question

I am trying to create a simple Xamarin forms app which allows the user to browse for or take a photo and have azure cognitive services tag the photo using a custom vision model.

I am unable to get the client to successfully authenticate or find a resource per the error message in the exception produced by the VisionServiceClient. Am I missing something? What would be the correct values to use for the arguments to VisionServiceClient?

All keys have been removed from the below images, they are populated.

Exception thrown in VS2017:

'Microsoft.ProjectOxford.Vision.ClientException' in System.Private.CoreLib.dll

Call to VisionServiceClient:

private const string endpoint = @"https://eastus2.api.cognitive.microsoft.com/vision/prediction/v1.0";
private const string key = "";

VisionServiceClient visionClient = new VisionServiceClient(key, endpoint);
VisualFeature[] features = { VisualFeature.Tags, VisualFeature.Categories, VisualFeature.Description };
try
{
     AnalysisResult temp = await visionClient.AnalyzeImageAsync(imageStream,                    
     features.ToList(), null);

     return temp;
}
catch(Exception ex)
{
     return null;
}

VS Exception Error:

Azure Portal for cognitive services:

Custom Vision Portal:

Answer 1

It looks like you're confusing the Computer Vision and the Custom Vision APIs. You are attempting to use the client SDK for the former using the API key of the latter.

For .NET languages, you'll want the Microsoft.Azure.CognitiveServices.Vision.CustomVision.Prediction NuGet package.

Your code will end up looking something like this:

ICustomVisionPredictionClient client = new CustomVisionPredictionClient()
{
    ApiKey = PredictionKey,
    Endpoint = "https://southcentralus.api.cognitive.microsoft.com"
};
ImagePrediction prediction = await client.PredictImageAsync(ProjectId, stream, IterationId);