Ok, this is absolutely doing my head in as I have searched for countless examples all of which seem to suggest I'm not doing anything wrong... Basically, I just want to control the visibility/usability of my external command. Everywhere I've read suggests:
namespace HERibbon
{
// [Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public class Availability : IExternalCommandAvailability
{
public bool IsCommandAvailable(UIApplication uiApp, CategorySet catSet)
{
// if (catSet.IsEmpty) return true;
// if (uiApp.ActiveUIDocument.Document.IsFamilyDocument) return false;
// if (uiApp.ActiveUIDocument.Document.IsModifiable) return true;
return true;
}
}
class App : IExternalApplication
{
static void AddRibbonPanel(UIControlledApplication application)
{
// Create the ribbon tab
String tabName = @"H&E Tools";
application.CreateRibbonTab(tabName);
// Create the panels on that tab
RibbonPanel rp_About = application.CreateRibbonPanel(tabName, "About");
// Get our installation path
string thisAssemblyPath = Assembly.GetExecutingAssembly().Location;
// Add to the About Panel
// About
PushButtonData pbData_About = new PushButtonData("About", "Info", thisAssemblyPath, "HETools.About");
// pbData_About.AvailabilityClassName = "HERibbon.Availability";
PushButton pb_About = rp_About.AddItem(pbData_About) as PushButton;
pb_About.ToolTip = @"H&E Tools version info.";
BitmapImage image_About = new BitmapImage(new Uri(@"C:\Program Files\HETools\src\about.ico"));
pb_About.LargeImage = image_About;
pb_About.Image = image_About;
pb_About.AvailabilityClassName = "HERibbon.Availability";
}
public Result OnStartup(UIControlledApplication application)
{
AddRibbonPanel(application);
return Result.Succeeded;
}
public Result OnShutdown(UIControlledApplication application)
{
return Result.Succeeded;
}
}
}The commented out code are combos I've tried to get this thing to work.
The problem is when I select my tab on the ribbon when no document is open I get the following error:
Debug says the exception is thrown at the public bool IsCommandAvailable. If I comment out the class, my plugin works fine. Even with the exception, the plugins still work once a project is opened, however, I need to fix this. My main plugin is a workshare enabler that I obviously can't have being run in the family editor (for example).
I have literally tried copying and pasting this sample and I still get a null ref error. I started from thebuildingcoder's zerodoc and am getting the same exception. I am absolutely out of ideas... has something changed in 2019?
