I hope i am in the correct category. I made a little code block to help me swtich between 2 sources of element lists. This is for debugging purposes do i do not have to run the code on the whole Revit project, but on a selected portion of it. And i can switch back and forth with flip of a switch…

My point is that your list structure was not the same. An If statement always returns the length of the shortest list. You may have over 4000 pipe elements, but the list you’re using is 11 sublists (1 for each family type). That’s also why you’re getting the null values for that selection - the cond…

Difference between IF then code block

Lists-Logic

Jan_Secnik October 25, 2019, 8:21am 3

You can check this post:

Problem might be lengths of your lists.

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Difference between IF then code block

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