Reason to Stacktrace

Question

Hi,
Is it possible that error below

at System.String.IndexOf(String value, Int32 startIndex, Int32 count, StringComparison comparisonType)
at System.String.IndexOf(String value, Int32 startIndex)
at Validate_File1.Program.Main(String[] args)

is due to this part of code? How to avoid it?

                                                if (Pos4 - 3 - Pos3 > 0)
                                                    Email = l7[j].Substring(Pos3 + 2, Pos4 - 3 - Pos3);

Answer 1

The text file you are reading has blank lines (Error.txt).

When the current line is a blank line, its length is 0, then use IndexOf(Char, Int32), startIndex is greater than the length of the string, this problem will occur.

Try to add a judgment, if the current line length is 0, use continue to enter the next round of loop.

---

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

No.

From the variable name, I think the line throwing error should be on assignment of value for Pos4, Pos3 or even Pos2 or Pos1/Pos instead. Try find "IndexOf" with Ctrl-F on that source file.

Also, if you think these lines throwing that error because of the line number in stack trace, chances are that the source code version is not the same as the binary throwing the exception.