private bool Execute(
            ITextBuffer textBuffer,
            ITextView view,
            IUIThreadOperationContext waitContext)
        {
            var cancellationToken = waitContext.UserCancellationToken;

            var spans = view.Selection.GetSnapshotSpansOnBuffer(textBuffer);

            if (spans.Count(s => s.Length > 0) != 1)
            {
                return(false);
            }

            var document = textBuffer.CurrentSnapshot.GetFullyLoadedOpenDocumentInCurrentContextWithChanges(
                waitContext, _threadingContext);

            if (document == null)
            {
                return(false);
            }

            var options = _globalOptions.GetExtractMethodOptions(document.Project.Language);
            var result  = ExtractMethodService.ExtractMethodAsync(
                document, spans.Single().Span.ToTextSpan(), localFunction: false, options, cancellationToken).WaitAndGetResult(cancellationToken);

            Contract.ThrowIfNull(result);

            if (!result.Succeeded && !result.SucceededWithSuggestion)
            {
                // if it failed due to out/ref parameter in async method, try it with different option
                var newResult = TryWithoutMakingValueTypesRef(document, spans, result, options, cancellationToken);
                if (newResult != null)
                {
                    var notificationService = document.Project.Solution.Workspace.Services.GetService <INotificationService>();
                    if (notificationService != null)
                    {
                        // We are about to show a modal UI dialog so we should take over the command execution
                        // wait context. That means the command system won't attempt to show its own wait dialog
                        // and also will take it into consideration when measuring command handling duration.
                        waitContext.TakeOwnership();
                        if (!notificationService.ConfirmMessageBox(
                                EditorFeaturesResources.Extract_method_encountered_the_following_issues + Environment.NewLine + Environment.NewLine +
                                string.Join(Environment.NewLine, result.Reasons) + Environment.NewLine + Environment.NewLine +
                                EditorFeaturesResources.We_can_fix_the_error_by_not_making_struct_out_ref_parameter_s_Do_you_want_to_proceed,
                                title: EditorFeaturesResources.Extract_Method,
                                severity: NotificationSeverity.Error))
                        {
                            // We handled the command, displayed a notification and did not produce code.
                            return(true);
                        }
                    }

                    // reset result
                    result = newResult;
                }
                else if (TryNotifyFailureToUser(document, result, waitContext))
                {
                    // We handled the command, displayed a notification and did not produce code.
                    return(true);
                }
            }

            // apply the change to buffer
            // get method name token
            ApplyChangesToBuffer(result, textBuffer, cancellationToken);

            // start inline rename
            var methodNameAtInvocation  = result.InvocationNameToken;
            var snapshotAfterFormatting = textBuffer.CurrentSnapshot;
            var documentAfterFormatting = snapshotAfterFormatting.GetOpenDocumentInCurrentContextWithChanges();

            _renameService.StartInlineSession(documentAfterFormatting, methodNameAtInvocation.Span, cancellationToken);

            // select invocation span
            view.TryMoveCaretToAndEnsureVisible(new SnapshotPoint(snapshotAfterFormatting, methodNameAtInvocation.Span.End));
            view.SetSelection(
                methodNameAtInvocation.Span.ToSnapshotSpan(snapshotAfterFormatting));

            return(true);
        }