Autodesk.Revit.Exceptions.InvalidObjectException

Autodesk.Revit.Exceptions.InvalidObjectException is an exception that is thrown when an invalid object is encountered in the Revit API.

Causes

An InvalidObjectException may be thrown for a variety of reasons. Here are some of the common ones:

• The object passed to a method does not exist or is not a valid Revit object.
• The object is not currently in a valid state for the requested operation.
• The object is in a state that cannot be modified.

Resolution

To resolve an InvalidObjectException, you should first try to understand the reason for the exception. Check the method documentation and make sure that the object passed to the method is valid and in a valid state for the operation.

If the issue persists, here are some other things to try:

• Check if the object has been deleted or modified by another part of the code.
• Check if any other exceptions have been thrown before the InvalidObjectException. They may provide more information on what caused the issue.

If none of these steps resolve the issue, contact Autodesk support for further assistance.

Example

Here is an example code snippet that may throw an InvalidObjectException:

try 
{
   // Get the currently active view
   Autodesk.Revit.DB.View activeView = uidoc.ActiveView;

   // Attempt to modify the viewport of the active view
   activeView.GetViewports().First().SetBoxCropActive(true);

} 
catch (Autodesk.Revit.Exceptions.InvalidObjectException ex) 
{
   // Handle the exception
   TaskDialog.Show("Error", "Could not modify view due to invalid object: " + ex.Message);
}

In this example, if the currently active view does not have any viewports, an InvalidObjectException will be thrown when attempting to modify the viewport.

Conclusion

Autodesk.Revit.Exceptions.InvalidObjectException can be caused by a variety of issues, but typically indicates that the object passed to a method is not valid for the requested operation. By understanding the reasons behind these exceptions, you can take steps to resolve them and create more robust and reliable Revit API code.