Error when reassembling a string. Size is out

Question

I can’t fill out that list the way it is:

foreach (var item in text)
            {
                string[] linha = item.Split('\n');
                foreach (var i in linha)
                {
                    string nova_string = i.Substring(0, i.LastIndexOf("\r"));
                    lista.Add(nova_string);                    
                }                
            }

You’re making that mistake:

Length cannot be less than zero. Parameter name: length

Answer 1

The expression i.LastIndexOf("\r") is not finding the character sought. When what is being searched within the string is not found the return of this method is -1, as documentation.

Then you can only use its output if you can ensure that the one you are looking for exists. You need to use a command if or the conditional operator ? : to decide what to do, or what result to return when the text does not exist.