public async Task DeleteWithHttpMessagesAsync()

in src/Graph.Rbac/Version1_6/ServicePrincipalsOperations.cs [447:582]
124 lines of code
26 McCabe index (conditional complexity)

        public async Task<AzureOperationResponse> DeleteWithHttpMessagesAsync(string objectId, Dictionary<string, List<string>> customHeaders = null, CancellationToken cancellationToken = default(CancellationToken))
        {
            if (objectId == null)
            {
                throw new ValidationException(ValidationRules.CannotBeNull, "objectId");
            }
            if (Client.ApiVersion == null)
            {
                throw new ValidationException(ValidationRules.CannotBeNull, "this.Client.ApiVersion");
            }
            if (Client.TenantID == null)
            {
                throw new ValidationException(ValidationRules.CannotBeNull, "this.Client.TenantID");
            }
            // Tracing
            bool _shouldTrace = ServiceClientTracing.IsEnabled;
            string _invocationId = null;
            if (_shouldTrace)
            {
                _invocationId = ServiceClientTracing.NextInvocationId.ToString();
                Dictionary<string, object> tracingParameters = new Dictionary<string, object>();
                tracingParameters.Add("objectId", objectId);
                tracingParameters.Add("cancellationToken", cancellationToken);
                ServiceClientTracing.Enter(_invocationId, this, "Delete", tracingParameters);
            }
            // Construct URL
            var _baseUrl = Client.BaseUri.AbsoluteUri;
            var _url = new System.Uri(new System.Uri(_baseUrl + (_baseUrl.EndsWith("/") ? "" : "/")), "{tenantID}/servicePrincipals/{objectId}").ToString();
            _url = _url.Replace("{objectId}", objectId);
            _url = _url.Replace("{tenantID}", System.Uri.EscapeDataString(Client.TenantID));
            List<string> _queryParameters = new List<string>();
            if (Client.ApiVersion != null)
            {
                _queryParameters.Add(string.Format("api-version={0}", System.Uri.EscapeDataString(Client.ApiVersion)));
            }
            if (_queryParameters.Count > 0)
            {
                _url += (_url.Contains("?") ? "&" : "?") + string.Join("&", _queryParameters);
            }
            // Create HTTP transport objects
            var _httpRequest = new HttpRequestMessage();
            HttpResponseMessage _httpResponse = null;
            _httpRequest.Method = new HttpMethod("DELETE");
            _httpRequest.RequestUri = new System.Uri(_url);
            // Set Headers
            if (Client.GenerateClientRequestId != null && Client.GenerateClientRequestId.Value)
            {
                _httpRequest.Headers.TryAddWithoutValidation("x-ms-client-request-id", System.Guid.NewGuid().ToString());
            }
            if (Client.AcceptLanguage != null)
            {
                if (_httpRequest.Headers.Contains("accept-language"))
                {
                    _httpRequest.Headers.Remove("accept-language");
                }
                _httpRequest.Headers.TryAddWithoutValidation("accept-language", Client.AcceptLanguage);
            }


            if (customHeaders != null)
            {
                foreach(var _header in customHeaders)
                {
                    if (_httpRequest.Headers.Contains(_header.Key))
                    {
                        _httpRequest.Headers.Remove(_header.Key);
                    }
                    _httpRequest.Headers.TryAddWithoutValidation(_header.Key, _header.Value);
                }
            }

            // Serialize Request
            string _requestContent = null;
            // Set Credentials
            if (Client.Credentials != null)
            {
                cancellationToken.ThrowIfCancellationRequested();
                await Client.Credentials.ProcessHttpRequestAsync(_httpRequest, cancellationToken).ConfigureAwait(false);
            }
            // Send Request
            if (_shouldTrace)
            {
                ServiceClientTracing.SendRequest(_invocationId, _httpRequest);
            }
            cancellationToken.ThrowIfCancellationRequested();
            _httpResponse = await Client.HttpClient.SendAsync(_httpRequest, cancellationToken).ConfigureAwait(false);
            if (_shouldTrace)
            {
                ServiceClientTracing.ReceiveResponse(_invocationId, _httpResponse);
            }
            HttpStatusCode _statusCode = _httpResponse.StatusCode;
            cancellationToken.ThrowIfCancellationRequested();
            string _responseContent = null;
            if ((int)_statusCode != 204)
            {
                var ex = new GraphErrorException(string.Format("Operation returned an invalid status code '{0}'", _statusCode));
                try
                {
                    _responseContent = await _httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
                    GraphError _errorBody =  Rest.Serialization.SafeJsonConvert.DeserializeObject<GraphError>(_responseContent, Client.DeserializationSettings);
                    if (_errorBody != null)
                    {
                        ex.Body = _errorBody;
                    }
                }
                catch (JsonException)
                {
                    // Ignore the exception
                }
                ex.Request = new HttpRequestMessageWrapper(_httpRequest, _requestContent);
                ex.Response = new HttpResponseMessageWrapper(_httpResponse, _responseContent);
                if (_shouldTrace)
                {
                    ServiceClientTracing.Error(_invocationId, ex);
                }
                _httpRequest.Dispose();
                if (_httpResponse != null)
                {
                    _httpResponse.Dispose();
                }
                throw ex;
            }
            // Create Result
            var _result = new AzureOperationResponse();
            _result.Request = _httpRequest;
            _result.Response = _httpResponse;
            if (_httpResponse.Headers.Contains("x-ms-request-id"))
            {
                _result.RequestId = _httpResponse.Headers.GetValues("x-ms-request-id").FirstOrDefault();
            }
            if (_shouldTrace)
            {
                ServiceClientTracing.Exit(_invocationId, _result);
            }
            return _result;
        }