Index of repeated values in list

How would I extract the indices of the repeated values in a list?

Do you mean a specific repeating value, or any value that occurs more than one time? Would be helpful if you post a file with your list and a little more specifics about the task.

With few lines of C# code can be done easily (11.0 KB)


I guess the “set” functions can help you. something different to list.

something like this:

good job!