Amazon.Runtime.Internal.Util.OptimisticLockedTextFile.Persist C# (CSharp) Метод

        public void Persist()
        {
            var newContents = ToString();
            var path = Path.GetDirectoryName(FilePath);
            if (!Directory.Exists(path))
                Directory.CreateDirectory(path);

            // open the file with exclusive access
            using (var fileStream = new FileStream(FilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
            {
                // get a current copy of the file
                string currentContents = null;
                using (var streamReader = new StreamReader(fileStream))
                {
                    currentContents = streamReader.ReadToEnd();

                    // optimistic concurrency check - make sure the file hasn't changed since it was read
                    if (string.Equals(currentContents, OriginalContents, StringComparison.Ordinal))
                    {
                        // write the new contents
                        fileStream.Seek(0, SeekOrigin.Begin);
                        using (var streamWriter = new StreamWriter(fileStream))
                        {
                            streamWriter.Write(newContents);
                            streamWriter.Flush();

                            // set the length in case the new contents are shorter than the old contents
                            fileStream.Flush();
                            fileStream.SetLength(fileStream.Position);
                            OriginalContents = newContents;
                        }
                    }
                    else
                    {
                        throw new IOException(string.Format(CultureInfo.InvariantCulture,
                                                            "Cannot write to file {0}. The file has been modified since it was last read.", 
                                                            FilePath));
                    }
                }
            }
        }

 /// <summary>
 /// Persist the changes to this INI file to disk.
 /// </summary>
 public void Persist()
 {
     Validate();
     textFile.Persist();
 }