Amazon.SecurityToken.AmazonSecurityTokenServiceClient.GetFederationTokenAsync C# (CSharp) Метод

        public void GetFederationTokenAsync(GetFederationTokenRequest request, AmazonServiceCallback<GetFederationTokenRequest, GetFederationTokenResponse> callback, AsyncOptions options = null)
        {
            options = options == null?new AsyncOptions():options;
            var marshaller = new GetFederationTokenRequestMarshaller();
            var unmarshaller = GetFederationTokenResponseUnmarshaller.Instance;
            Action<AmazonWebServiceRequest, AmazonWebServiceResponse, Exception, AsyncOptions> callbackHelper = null;
            if(callback !=null )
                callbackHelper = (AmazonWebServiceRequest req, AmazonWebServiceResponse res, Exception ex, AsyncOptions ao) => { 
                    AmazonServiceResult<GetFederationTokenRequest,GetFederationTokenResponse> responseObject 
                            = new AmazonServiceResult<GetFederationTokenRequest,GetFederationTokenResponse>((GetFederationTokenRequest)req, (GetFederationTokenResponse)res, ex , ao.State);    
                        callback(responseObject); 
                };
            BeginInvoke<GetFederationTokenRequest>(request, marshaller, unmarshaller, options, callbackHelper);
        }