从使用Xamarin创建的iOS应用程序调用Azure认知服务时遇到Foundation.MonoTouchException

如何解决从使用Xamarin创建的iOS应用程序调用Azure认知服务时遇到Foundation.MonoTouchException

我正在使用C＃SDK呼叫cognitive services image analyzer feature。 C＃脚本本身运行良好。但是，当我从Xamarin in C#构建的iOS应用中调用它时，运行时会遇到Foundation.MonoTouchException。 我认为以下详细信息应有助于更好地理解问题。

这是Main.storyboard。

这是Viewcontroller.cs的样子：

using System;
using UIKit;


namespace colors
{
    public partial class ViewController : UIViewController
    {
        public ViewController(IntPtr handle) : base(handle)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            string list_of_colors = "";

            getColor.TouchUpInside += async (object sender,EventArgs e) => {
                // Convert the phone number with text to a number
                // using PhoneTranslator.cs
                list_of_colors = await ApiCall.AnalyzeImageUrl(
                    URLholder.Text);

                display.Text = list_of_colors;
            };
        }

       
        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
            // Release any cached data,images,etc that aren't in use.
        }

    }
}

这是apiCall.cs的样子：

using System;
using System.Collections.Generic;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision.Models;
using System.Threading.Tasks;
using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Threading;
using System.Linq;

namespace colors
{
    public static class ApiCall
    {
        /*
         * AUTHENTICATE
         * Creates a Computer Vision client used by each example.
         */
        public static ComputerVisionClient Authenticate(string endpoint,string key)
        {
            ComputerVisionClient client =
              new ComputerVisionClient(new ApiKeyServiceClientCredentials(key))
              { Endpoint = endpoint };
            return client;
        }
        public static async Task<string> AnalyzeImageUrl(string raw)
        {
            // Add your Computer Vision subscription key and endpoint to your environment variables. 
            // Close/reopen your project for them to take effect.
            string subscriptionKey = "COMPUTER_VISION_SUBSCRIPTION_KEY";
            string endpoint = "COMPUTER_VISION_ENDPOINT";
            // Create a client
            ComputerVisionClient client = Authenticate(endpoint,subscriptionKey);
            IList<VisualFeatureTypes> features = new List<VisualFeatureTypes>()
            {
                VisualFeatureTypes.Color
            };
            Console.WriteLine($"Analyzing the image {Path.GetFileName(raw)}...");
            Console.WriteLine();
            // Analyze the URL image 
            ImageAnalysis results = await client.AnalyzeImageAsync(raw,features);

            return string.Join(",",results.Color.DominantColors);
        }
    }
}

此帖子是我能找到的最接近解决方案的帖子，但没有帮助。我不喜欢这种访问天蓝色认知服务的方法。我愿意接受其他方法来访问iOS应用中的天蓝色认知服务（如果可用）。但这是首选。

这是我第一次尝试使用iOS应用程序和C＃，请放轻松。

编辑：这是堆栈跟踪。

eason: -[ViewController GetColor_TouchUpInside:]: unrecognized selector sent to instance 0x7fc1d0d10540
Native stack trace:
    0   CoreFoundation                      0x00007fff23e3de6e __exceptionPreprocess + 350
    1   libobjc.A.dylib                     0x00007fff512539b2 objc_exception_throw + 48
    2   CoreFoundation                      0x00007fff23e5eb94 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
    3   UIKitCore                           0x00007fff49354af0 -[UIResponder doesNotRecognizeSelector:] + 302
    4   CoreFoundation                      0x00007fff23e4286c ___forwarding___ + 1436
    5   CoreFoundation                      0x00007fff23e44b58 _CF_forwarding_prep_0 + 120
    6   UIKitCore                           0x00007fff49326c1d -[UIApplication sendAction:to:from:forEvent:] + 83
    7   UIKitCore                           0x00007fff48cd5baa -[UIControl sendAction:to:forEvent:] + 223
    8   UIKitCore                           0x00007fff48cd5ef2 -[UIControl _sendActionsForEvents:withEvent:] + 396
    9   UIKitCore                           0x00007fff48cd4e63 -[UIControl touchesEnded:withEvent:] + 497
    10  UIKitCore                           0x00007fff49362508 -[UIWindow _sendTouchesForEvent:] + 1359
    11  UIKitCore                           0x00007fff4936428d -[UIWindow sendEvent:] + 4501
    12  UIKitCore                           0x00007fff4933e6d1 -[UIApplication sendEvent:] + 356
    13  UIKitCore                           0x00007fff493c94ce __dispatchPreprocessedEventFromEventQueue + 7628
    14  UIKitCore                           0x00007fff493cc692 __handleEventQueueInternal + 6584
    15  UIKitCore                           0x00007fff493c2f35 __handleHIDEventFetcherDrain + 88
    16  CoreFoundation                      0x00007fff23da1c91 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    17  CoreFoundation                      0x00007fff23da1bbc __CFRunLoopDoSource0 + 76
    18  CoreFoundation                      0x00007fff23da1394 __CFRunLoopDoSources0 + 180
    19  CoreFoundation                      0x00007fff23d9bf8e __CFRunLoopRun + 974
    20  CoreFoundation                      0x00007fff23d9b8a4 CFRunLoopRunSpecific + 404
    21  GraphicsServices                    0x00007fff38c39bbe GSEventRunModal + 139
    22  UIKitCore                           0x00007fff49325968 UIApplicationMain + 1605
    23  ???                                 0x00000001112e5035 0x0 + 4583215157
    24  ???                                 0x00000001112e4d83 0x0 + 4583214467
    25  ???                                 0x00000001106f8943 0x0 + 4570712387
    26  colors                              0x000000010ab8b2b1 mono_jit_runtime_invoke + 1569
    27  colors                              0x000000010aca3e48 mono_runtime_invoke_checked + 136
    28  colors                              0x000000010aca92c5 mono_runtime_exec_main_checked + 117
    29  colors                              0x000000010aaf718c mono_jit_exec + 364
    30  colors                              0x000000010ada2ccd xamarin_main + 2685
    31  colors                              0x

堆栈跟踪，由@Jason请求