private async Task AddRule() { var dialog = new ImportRuleSelectDialog(AccountApi.RuleType.AD_Import); await DialogHost.Show( dialog, "RootDialog", (sender, eventArgs) => { var result = eventArgs.Parameter as string; if (result == "true") { var rule = state.AddimportRule(dialog.SelectedRule); eventArgs.Handled = true; } } ).ConfigureAwait(false); }