问Azure认知服务- Vision API单次调用导致9个事务

EN

public async Task<IActionResult> ConvertToText(string url)
        {
            string subscriptionKey = "jfh3879rhf4389terhkjy86";

            ComputerVisionClient computerVision = new ComputerVisionClient(
                new ApiKeyServiceClientCredentials(subscriptionKey),
                new System.Net.Http.DelegatingHandler[] { });

            // Specify the Azure region
            computerVision.Endpoint = "https://westcentralus.api.cognitive.microsoft.com";


            if (!Uri.IsWellFormedUriString(url, UriKind.Absolute))
            {
                return null;
            }

            TextRecognitionMode textRecognitionMode = TextRecognitionMode.Printed;
            int numberOfCharsInOperationId = 36;

            // Start the async process to recognize the text
            RecognizeTextHeaders textHeaders =
                await computerVision.RecognizeTextAsync(url, textRecognitionMode);

            // Retrieve the URI where the recognized text will be
            // stored from the Operation-Location header
            string operationId = textHeaders.OperationLocation.Substring(
                textHeaders.OperationLocation.Length - numberOfCharsInOperationId);

            TextOperationResult result =
                await computerVision.GetTextOperationResultAsync(operationId);

            // Wait for the operation to complete
            int i = 0;
            int maxRetries = 10;
            while ((result.Status == TextOperationStatusCodes.Running ||
                    result.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries)
            {
                Console.WriteLine("Server status: {0}, waiting {1} seconds...", result.Status, i);
                await Task.Delay(1000);

                result = await computerVision.GetTextOperationResultAsync(operationId);
            }

            // Display the results
            var lines = result.RecognitionResult.Lines;
            string details = "";

            foreach (Line line in lines)
            {
                details += line.Text + Environment.NewLine;
            }

            return Content(details);
        }