RevitSdkSamples/SDK/Samples/UIAPI/CS/ApplicationAvailabilityClass.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
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// object code form for any purpose and without fee is hereby granted,
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Autodesk.Revit.UI;
using Autodesk.Revit.ApplicationServices; 


namespace Revit.SDK.Samples.UIAPI.CS
{
    class ApplicationAvailabilityClass : IExternalCommandAvailability
    {
        public bool IsCommandAvailable(UIApplication applicationData, 
                                    Autodesk.Revit.DB.CategorySet selectedCategories)
        {
            Application revitApplication = applicationData.Application;
            ApplicationOptions options = ApplicationOptions.Get();

            switch (options.Availability)
            {
                case ApplicationAvailablity.ArchitectureDiscipline:
                    return revitApplication.IsArchitectureEnabled;
                case ApplicationAvailablity.StructuralAnalysis:
                    return revitApplication.IsStructuralAnalysisEnabled;
                case ApplicationAvailablity.MEP:
                    return revitApplication.IsSystemsEnabled;
            }
            return true;
        }
    }
}