Get suffix from a string as int

user_17265409 0
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I've got a list containing file information on a remote server. The files on this server have a certain file name with a suffix that increments and is always 9 characters long:

  • 20220123SOMENAME000000001
  • 20220132SOMENAME000000002
  • 20220201SOMENAME000030000
  • 20220202SOMENAME000030002

I'm trying to create a method that takes the string above as input and returns an int (1, 2, 30000 and 30002) from the examples above.

public int GetCounterFromFileName(string fileName)
{
    // some logic extracting the index.

    int index = 0;

    return index;
}

Should I use regex to delete the prefix and infix and then get the index from the suffix?

integer string c#
2 Answers

You can convert the last nine digits of the filename to integer by:

public int GetCounterFromFileName(string fileName)
{
    return Convert.ToInt32(fileName[^9..]);
}
user_196857370

I'd use substring to cut out the last nine characters, and then parse them to an int:

public int GetCounterFromFileName(string fileName)
{
    return int.ParseInt(fileName.Substring(fileName.Length - 9));
}
user_24227760
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