Hi everyone,
I am having a strange issue here by inputting List.ContainsItem node. I am taking values from excel file and giving it to List.ContainsItem node. But it doesn’t work. If I do it manually using a code block node then it works. Here, I am filtering rooms element ids based on the rooms numbers.
Haven’t you inverted your inputs in the List.ContainsItem node ?
Also the issue is the object type… You need to know the difference between strings, doubles and integers 
use Object.type node to see what types you’re using
you can use string.fromobject to change types to strings put it after your values before your query
Thank you for your quick reply. Yes, there was an issue to data type. I have converted it from double to string but still its not working. Both list values are of string type.
See if this helps 
It should show the logic behind what you’re trying to do:
To @mellouze’s point it can olse be done by flipping the inputs in “List.ContainsItem” node Many ways to Rome
Actually my List.ContainsItem node is not working; that`s the issue. It doesn’t show the correct output as i am using the correct data types.
Please show using the Object.Type node to verify your data types and all your previews enabled
That is very odd… Try restarting Dynamo and Revit… There might be something that hangs up your graph…
Alternatively use the “SpringsUI.Refresh” node from the SpringsUI package.
I have restarted it many times. When i manually give the values, it works. But from the excel file it doesn`t.
Are you sure that neither of the inputs in the String from Object node are already of the string type ? It may be possible that one of them is already a string and that there is an extra space that we simply cannot see. (Just throwing random ideas, hoping it works )
Actually, the problem was in taking input from the excel file. I have used your way @Jonathan.Olesen to read the excel file and it worked Thank you so much.
Using “true” as the “readasstring” input in the excel node you can actually skip the “String from Object” node as the data is already read as strings
The issue from before (using the other node) is quite clear 
As it read “doubles” the “String from Object” adds trailing zeroes to your numbers meaning that they do not match
Yes, you are absolutely right. Finally i have done my task i.e. highlighting the rooms with the help of your answers 
Thanks a lot
