Grasshopper

algorithmic modeling for Rhino

Accepting NULL items in the List as Input Parameter

Hi,

I have registered an input parameter in the custom component as following:

pManager.AddBrepParameter("List of Brep", "srfs", "Surfaces to select from", GH_ParamAccess.list)

However when the one of the input is Null, GH gives an error: "Value cannot be NULL".

How can I allow to accept Null values in the input however to filter them out to proceed only with valid List members?

Thanks in advance,

Dmitriy

Views: 357

Replies to This Discussion

Permalink Reply by Marios Tsiliakos on March 18, 2013 at 11:01am

Hi,

You can set a conditional after the declaration where you check whether you brep is valid. Then you either return or continue with the solution.

C# 
public virtualboolIsValid { get; }
Visual Basic 
Public Overridable ReadOnly Property IsValid AsBooleanGet

Best,

M

edit: haven't test this, but I think it will work..

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