False-Positive 1854 while increment in same statement with a calculation

Rules and Languages Report False-positive / False-negative...
4

Hello @HBoskugelS,

Welcome to the community!

This behavior has already been discussed.
Your ++int_Position usage can be translated to int_Position = int_Position + 1:

else
{
  obj_Options.Add(str_Option.Substring(1, int_Position - 1),
                  str_Option.Substring(int_Position = int_Position + 1));
}

Which leads to an unused assignment.
Then, I would suggest replacing ++int_Position with int_Position + 1.

You can find here the previous discussion about this:

Have a nice day!