Bug: SurfaceBody.IsEntityValid fails for C#

[DynamicObjects]

Hello Autodesk, I am reporting a bug in Inventor:

Calling SurfaceBody.IsEntityValid() from VBA succeeds.

Calling SurfaceBody.IsEntityValid() from C# fails.

Both code samples below are run on the same Part file, and the same version of Inventor Professional 2020.

Here is the VBA code which works:

You can see from the Immediate window that all properties report correctly for the two solids in the model; 'Solid9' and 'Solid19'.

Now the same properties are requested via C# code below which fails:

Note that you can see both in the Console window and in VS lines 44, 45 and 46 that Surface Body 'Solid9' was able to return the properties .IsSolid, .Visible and .IsTransient, but fails with a COM exception for the method .IsEntityValid().

For your inspection and to reproduce the behaviour I have attached the part file used in this demo.

Please can you advise of a workaround or a fix ?

Best regards

Dan

[bradeneuropeArthur]

Hi,

I see a difference:

Try this in VBA too like you do in C#

for each SB in Pdef.SurfaceBodies

Debug.print.....

next

Gives this also a error?

Regards,

[DRoam · Accepted solution]

Hm, I'm getting the same error in iLogic with this simple rule, run in a part with nothing but a Box primitive modeled:

Dim oThisDoc As Inventor.PartDocument = ThisDoc.Document

For Each sb As SurfaceBody In oThisDoc.ComponentDefinition.SurfaceBodies
	MsgBox(sb.IsEntityValid)
Next

I tried it with and without the parentheses after "IsEntityValid", didn't make a difference.

This does seem to be a bug in the API. @johnsonshiue can this be logged?

@DynamicObjects, in the meantime, I was able to get it to return a value by providing it with "dummy" values for the first and third arguments, and the default value (3) for the second argument, like this:

MsgBox(sb.IsEntityValid(Nothing, 3, Nothing))

 Could you try that and see if it works for your C# application? (EDIT: Note that in C#, I believe the "Nothing" should be replaced with "null".)

[DynamicObjects]

Just confirming for you that

for each SB in Pdef.SurfaceBodies

has the identical successful outcome in VBA as 

Dim SurfaceBodies As SurfaceBodies
Set SurfaceBodies = PDef.SurfaceBodies
For Each SB In SurfaceBodies

and that conversely in C# you also get failure for either construct.

[DynamicObjects]

@DRoam - I confirm that adding the explicit arguments null, 3, null to the c# call does indeed result in success ! Thanks for your help on this.

[DRoam]

Glad it worked! Hopefully the bug can still be fixed to save others from going through the same trouble.