C# Functions, Returning new values in a list

Hello there,

I am trying to split a brep, take one splitted part, transform it. Then, collect the transfromed part in a list and apply same rules to collected breps as splitting, transforming and collecting. So, I have written a piece of c# code in Grasshopper which I thought it might work, but it gives me the error saying "the collection has been changed".

Is there anyone who might know where is the problem? I have attached the Rhino and grasshopper files.

Thanks in advance,

Irem

Attachments:

Split_Brep_List.3dm, 35 KB
Split_Brep_List_8.gh, 5 KB

Replies to This Discussion

Permalink Reply by David Rutten on March 7, 2017 at 7:35am

When you use a foreach loop to iterate over all the items in a collection, you are not allowed to modify that collection within the loop.

If you want to operate on a collection of objects and each iteration may append more objects to that collection, I recommend creating a Queue<T>, and popping items off the top from within an infinite do loop. Exit the loop once the queue is empty.

Permalink Reply by peter fotiadis on March 7, 2017 at 10:37am

As David said.

But ... well ... if I got it correctly(?) this is a classic recursive task

See attached.

Try to use the DO NOT use Method as well (only for the brave):

Attachments:

Recursive_Split_BrepFace_V1.gh, 121 KB

Permalink Reply by peter fotiadis on March 7, 2017 at 10:59am

Anyway ... added this %$@%$ Method as an option for the brave (but why it fails? who knows? and who cares?).

Attachments:

Recursive_Split_BrepFace_V1A.gh, 125 KB

Permalink Reply by Iremnur Tokac on March 12, 2017 at 6:58am

Thank you for replies :) I have solved it with a function just returnes the splitted brep output to be used as input in a while loop. And the rest I arranged with array lists.

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