assets/samples/Samples/ExtensibleStorageUtility/CS/DeleteStorage.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// 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 System.Diagnostics;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.ExtensibleStorage;

namespace Revit.SDK.Samples.ExtensibleStorageUtility.CS
{
   /// <summary>
   /// Deletes all extensible storage created by any application all active documents.
   /// This command will also report if there is no storage in the active document to delete.
   /// The document must be saved after the storage is deleted to commit the deletion.
   /// </summary>
   [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
   [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
   public class DeleteStorage : IExternalCommand
   {
      public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
      {
         Document document = commandData.Application.ActiveUIDocument.Document;

         if (!(StorageUtility.DoesAnyStorageExist(document)))
            message = "No storage in this document to delete.";
         else
         {
            Transaction tErase = new Transaction(document, "Erase EStorage");
            tErase.Start();
            IList<Schema> schemas = Schema.ListSchemas();
            foreach (Schema schema in schemas?.Where(x => x.WriteAccessLevel == AccessLevel.Public))
            {
               //Note-this will delete storage of this schema in *all* open documents.
               document.EraseSchemaAndAllEntities(schema);
            }
            tErase.Commit();
            message = "All storage was deleted.";
         }

         TaskDialog.Show("ExtensibleStorageUtility", message);
         return Result.Succeeded;

         
      }
   }

}