System.Configuration.BaseConfigurationRecord.NormalizeLocationSubPath C# (CSharp) Метод

        internal static string NormalizeLocationSubPath(string subPath, IConfigErrorInfo errorInfo) {
            // if subPath is null or empty, it is the current dir
            if (String.IsNullOrEmpty(subPath))
                return null;

            // if subPath=".", it is the current dir
            if (subPath == ".")
                return null;

            // do not allow whitespace in front of subPath, as the OS
            // handles beginning and trailing whitespace inconsistently
            string trimmedSubPath = subPath.TrimStart();
            if (trimmedSubPath.Length != subPath.Length) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Config_location_path_invalid_first_character), errorInfo);
            }

            // do not allow problematic starting characters
            if (invalidFirstSubPathCharacters.IndexOf(subPath[0]) != -1) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Config_location_path_invalid_first_character), errorInfo);
            }

            // do not allow whitespace at end of subPath, as the OS
            // handles beginning and trailing whitespace inconsistently
            trimmedSubPath = subPath.TrimEnd();
            if (trimmedSubPath.Length != subPath.Length) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Config_location_path_invalid_last_character), errorInfo);
            }

            // the file system ignores trailing '.', '\', or '/', so do not allow it in a location subpath specification
            if (invalidLastSubPathCharacters.IndexOf(subPath[subPath.Length-1]) != -1) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Config_location_path_invalid_last_character), errorInfo);
            }

            // combination of URI reserved characters and OS invalid filename characters, minus / (allowed reserved character)
            if (subPath.IndexOfAny(s_invalidSubPathCharactersArray) != -1) {
                throw new ConfigurationErrorsException(SR.GetString(SR.Config_location_path_invalid_character), errorInfo);
            }

            return subPath;
        }