private async Task BeforeQueryStatusAsync(object sender, EventArgs e)
{
var button = (OleMenuCommand)sender;
button.Visible = button.Enabled = false;
if (VsHelpers.DTE.SelectedItems.MultiSelect)
{
return;
}
var solution = (IVsSolution)ServiceProvider.GetService(typeof(SVsSolution));
if (await VsHelpers.SolutionContainsManifestFileAsync(solution))
{
button.Visible = true;
button.Enabled = KnownUIContexts.SolutionExistsAndNotBuildingAndNotDebuggingContext.IsActive && !_libraryCommandService.IsOperationInProgress;
}
}