System.Text.UTF7Encoding.GetString C# (CSharp) Метод

        public override string GetString(byte[] bytes, int index, int count)
        {
            throw null;
        }

        public string Decompress(string filename)
        {
            StringBuilder result = null;

            try
            {
                Stream s = new GZipInputStream(File.OpenRead(filename));

                result = new StringBuilder(8192);
                UTF7Encoding encoding = new UTF7Encoding(true);

                int size = 2048;
                byte[] writeData = new byte[2048];
                while (true)
                {
                    size = s.Read(writeData, 0, size);
                    if (size > 0)
                    {
                       result.Append(encoding.GetString(writeData,0,size));
                    }
                    else
                    {
                        break;
                    }
                }
                s.Close();

            } // end try
            catch (GZipException)
            {
                throw new Exception("Error: The file being read contains invalid data.");
            }
            catch (FileNotFoundException)
            {
                throw new Exception("Error:The file specified was not found.");
            }
            catch (ArgumentException)
            {
                throw new Exception("Error: path is a zero-length string, contains only white space, or contains one or more invalid characters");
            }
            catch (PathTooLongException)
            {
                throw new Exception("Error: The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.");
            }
            catch (DirectoryNotFoundException)
            {
                throw new Exception("Error: The specified path is invalid, such as being on an unmapped drive.");
            }
            catch (IOException)
            {
                throw new Exception("Error: An I/O error occurred while opening the file.");
            }
            catch (UnauthorizedAccessException)
            {
                throw new Exception("Error: path specified a file that is read-only, the path is a directory, or caller does not have the required permissions.");
            }

            return result.ToString();
        }