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I am trying to modify Jeremy's great post about Preventing Deleting of elements from the model so that it can actually be saved in the model which elements are being "protected". I tried using a Schema to write an Entity to an Element and then later have the IUpdater retireve that schema to see if element is protected from deletion. However, I am getting null for a doc.GetElement() method in IUpdater and I can't proceed with the rest of the code. Any help would be appreciated.
using System;
using System.Collections.Generic;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.DB.ExtensibleStorage;
namespace GrimshawRibbon
{
// Create Elment Filter that passes all elements through
public class ElementSelectionFilter : ISelectionFilter
{
public bool AllowElement(Element e)
{
return true;
}
public bool AllowReference(Reference r, XYZ p)
{
return false;
}
}
[TransactionAttribute(TransactionMode.Manual)]
public class PreventDeletion : IExternalCommand
{
Guid schemaGuid = new Guid("0DC954AE-ADEF-41c1-8D38-EB5B8465D255");
public const string Caption = "PreventDeletion";
public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
UIApplication uiapp = commandData.Application;
UIDocument uidoc = uiapp.ActiveUIDocument;
Document doc = uiapp.ActiveUIDocument.Document;
try
{
IList<Reference> refs = null;
ElementSelectionFilter selFilter = new ElementSelectionFilter();
try
{
// prompt user to add to selection or remove from it
Selection sel = uidoc.Selection;
refs = sel.PickObjects(ObjectType.Element, selFilter, "Please pick elements to prevent from deletion.");
}
// catch an exception if user hits ESC here
catch (Autodesk.Revit.Exceptions.OperationCanceledException)
{
return Result.Cancelled;
}
using (Transaction trans = new Transaction(doc, "AddElement-PreventDeletion"))
{
trans.Start();
foreach (Reference r in refs)
{
Element e = doc.GetElement(r);
if (e != null)
{
SchemaBuilder schemaBuilder = new SchemaBuilder(schemaGuid);
// allow anyone to read the object
schemaBuilder.SetReadAccessLevel(AccessLevel.Public);
// restrict writing to this vendor only
schemaBuilder.SetWriteAccessLevel(AccessLevel.Public);
// set schema name
schemaBuilder.SetSchemaName("PreventDeletionSchema");
// set documentation
schemaBuilder.SetDocumentation("A stored boolean value where true means that wall cannot be deleted.");
// create a field to store the bool value
FieldBuilder fieldBuilder = schemaBuilder.AddSimpleField("PreventDeletionField", typeof(String));
// register the schema
Schema schema = schemaBuilder.Finish();
// create an entity object (object) for this schema (class)
Entity entity = new Entity(schema);
// get the field from schema
Field fieldPreventDeletion = schema.GetField("PreventDeletionField");
// set the value for entity
entity.Set(fieldPreventDeletion, "Prevent");
// store the entity on the element
e.SetEntity(entity);
}
}
trans.Commit();
}
return Result.Succeeded;
}
catch (OperationCanceledException)
{
return Result.Cancelled;
}
catch (Exception ex)
{
message = ex.Message;
return Result.Failed;
}
}
}
}using System;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.DB;
using Autodesk.Revit.DB.ExtensibleStorage;
using System.Collections.Generic;
namespace GrimshawRibbon
{
class PreventDeletionUpdater : IUpdater
{
static AddInId _appId;
UpdaterId _updaterId;
FailureDefinitionId _failureId = null;
public PreventDeletionUpdater(AddInId addInId)
{
_appId = addInId;
_updaterId = new UpdaterId(_appId, new Guid("6f453eba-4b9a-40df-b637-eb72a9ebf008"));
_failureId = new FailureDefinitionId(new Guid("33ba8315-e031-493f-af92-4f417b6ccf70"));
FailureDefinition failureDefinition = FailureDefinition.CreateFailureDefinition(_failureId, FailureSeverity.Error, "Prevent Deletion: Sorry, this element cannot be deleted. Please contact your BIM Manager to find out why.");
}
public void Execute(UpdaterData data)
{
Document doc = data.GetDocument();
foreach (ElementId id in data.GetDeletedElementIds())
{
Element e = doc.GetElement(id) as Element;
if (e != null)
{
IList<Guid> schemaIds = e.GetEntitySchemaGuids();
if (schemaIds.Count != 0)
{
foreach (Guid schemaId in schemaIds)
{
Schema pdSchema = Schema.Lookup(schemaId);
if (pdSchema != null)
{
if (pdSchema.SchemaName == "PreventDeletionSchema")
{
FailureMessage failureMessage = new FailureMessage(_failureId);
failureMessage.SetFailingElement(id);
doc.PostFailure(failureMessage);
}
}
}
}
}
}
}
public string GetAdditionalInformation()
{
return "Prevent deletion of selected elements.";
}
public ChangePriority GetChangePriority()
{
return ChangePriority.FloorsRoofsStructuralWalls;
}
public UpdaterId GetUpdaterId()
{
return _updaterId;
}
public string GetUpdaterName()
{
return PreventDeletion.Caption;
}
}
}my app is running these updater registers on startup:
public Result OnStartup(UIControlledApplication application)
{
AddRibbonPanel(application);
#region Prevent Deletion Tool
// Failure Definition Registry
// Implemented in Prevent Deletion Tool
PreventDeletionUpdater deletionUpdater
= new PreventDeletionUpdater(application.ActiveAddInId);
UpdaterRegistry.RegisterUpdater(
deletionUpdater);
ElementClassFilter filter
= new ElementClassFilter(
typeof(Dimension), true);
UpdaterRegistry.AddTrigger(
deletionUpdater.GetUpdaterId(), filter,
Element.GetChangeTypeElementDeletion());
#endregion //Prevent Deletion Tool
#region DeleteAllViewsSheets Tool
m_MyForm = null; // no dialog needed yet; the command will bring it
thisApp = this; // static access to this application instance
#endregion //DeleteAllViewsSheets Tool
return Result.Succeeded;
}Of course huge thanks to Jeremy for posting all of this code. I wouldnt even be able to get to this point without his blog. Thank you!
Solved! Go to Solution.
