“arg_targetinvocationexception”-如何確定原因？

在此處輸入影像描述

private HttpClient CreateHttpClient(string UserToken = "")
            {
                HttpClientHandler handler = new HttpClientHandler();
                HttpClient httpClient = new HttpClient();
                httpClient.Timeout = TimeSpan.FromSeconds(20);
                httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));         
                httpClient.DefaultRequestHeaders.Add(AppConfig.HeaderKey_AppToken, AppConfig.HeaderValue_AppToken);
              
                if (!string.IsNullOrEmpty(UserToken))
                {
                    httpClient.DefaultRequestHeaders.Add("UserToken", UserToken);
                }
                return httpClient;
            }

例外發生在“HttpClient httpClient = new HttpClient(); httpClient.Timeout = TimeSpan.FromSeconds(20);” 這條線

我附上了圖片，我正面臨什么確切的“arg_targetinvocationexception”問題，請檢查。我正在使用 MAUI 和 VS2022 上的最新預覽版。當我訪問此功能時，我正面臨“arg_targetinvocationexception”這個問題

當我在除錯模式下運行應用程式時，它作業正常。但是當我在 Realese 模式下運行應用程式時，會在附加影像中顯示的警報框內顯示此錯誤。

private async Task SendOTPClicked()
        {
            try
            {
                var networkFlag = Common.Instance.IsNetworkConnected();
                if (networkFlag)
                {
                    CustomProgressDialog.Instance.ShowLoading(AppResources.Sending_lbl);
                    string url = $"{AppConfig.ApiBaseUrl}{AppConfig.ApiKeypoints_sendotp}";
                    string phonenumber = CountryCode.Replace(" ", "")   PhoneNumber;
                    string ApiUrl = $"{url}{phonenumber}";
                    var response = await RequestProviderService.Instance.PostAsync<ResponseViewModel<string>>(ApiUrl, phonenumber, "", AppConfig.TenantId_Value, "", null);
                    if (response != null)
                    {
                        if (response.Status)
                        {
                         
                               await UserDialogs.Instance.AlertAsync(response.Message, AppResources.Title_Success, AppResources.Ok_Flag);
                         
                            
                            await App.Current.MainPage.Navigation.PushAsync(new EnterOTPView(CountryCode.Replace(" ", "")   _phonenumber, User));
                            CustomProgressDialog.Instance.HideLoading();                
                        }
                        else
                        {
                            string errorMessage = string.IsNullOrEmpty(response.ErrorMessage) ? response.Message : response.ErrorMessage;
                            CustomProgressDialog.Instance.HideLoading();
                            if (!string.IsNullOrEmpty(errorMessage))
                            {
                                  await UserDialogs.Instance.AlertAsync(errorMessage, AppResources.Alert_Label, AppResources.Ok_Flag);
                            }
                        }
                    }
                    else
                    {
                        CustomProgressDialog.Instance.HideLoading();                        
                    }                        
                }
                else
                {
                  
                        await UserDialogs.Instance.AlertAsync(AppResources.NetworkError_CheckConnection, AppResources.Alert_Label, AppResources.Ok_Flag);
                 
                    
                }
            }
            catch (System.Exception ex)
            {
                CustomProgressDialog.Instance.HideLoading();
            }

        }

uj5u.com熱心網友回復：

我已經使用“AndroidMessageHandler()”并解決了我的問題

 if(Device.RuntimePlatform == Device.Android)
                    {
                        //HttpClientHandler handler = new HttpClientHandler();
                        var Msghandler = new Xamarin.Android.Net.AndroidMessageHandler();
                        httpClient = new HttpClient(Msghandler); 
                    }
                    else
                    {
                        httpClient = new HttpClient();
                    }

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