如何使用windows应用程序创建google翻译而不出现应用程序默认凭据不可用的错误？

Question

 try
        {
            var JsonFilePath = @"C:\Users\shanjeeva\source\repos\TranslatorWindowsApp\Translator-fa8e022a7ba1.json";

            //Authenticate to the service by using Service Account
            var credential = GoogleCredential.FromFile(JsonFilePath).CreateScoped(ImageAnnotatorClient.DefaultScopes);
            var channel = new Grpc.Core.Channel(ImageAnnotatorClient.DefaultEndpoint.ToString(), credential.ToChannelCredentials());

            var client = ImageAnnotatorClient.Create(); // getting an error here

            var image = Image.FromFile(@"D:\Work Temp\Translate.JPG");
            // Performs label detection on the image file
            var response = client.DetectLabels(image);
            foreach (var annotation in response)
            {
                if (annotation.Description != null)
                    Console.WriteLine(annotation.Description);
            }
        }
        catch (AnnotateImageException ex)
        {
            AnnotateImageResponse response = ex.Response;
            Console.WriteLine(response.Error);
        }
        catch (Exception ee)
        {
            Console.WriteLine(ee.Message);
            throw;
        }
    }

Answer 1

        try
        {
            var GAC = Environment.GetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS");

            if (GAC == null)
            {
                var path = @"D:\Work Temp\translator-298603-2bb5a20655a2.json";

                Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", path);
            }
        }
        catch (Exception)
        {
        }