cs11dotnet7/vscode/Chapter09/WorkingWithStreams/Program.cs

using System.Xml;

using static System.Environment;
using static System.IO.Path;

SectionTitle("Writing to text streams");

// define a file to write to
string textFile = Combine(CurrentDirectory, "streams.txt");

// create a text file and return a helper writer
StreamWriter text = File.CreateText(textFile);

// enumerate the strings, writing each one
// to the stream on a separate line
foreach (string item in Viper.Callsigns)
{
  text.WriteLine(item);
}
text.Close(); // release resources

// output the contents of the file
WriteLine("{0} contains {1:N0} bytes.",
  arg0: textFile,
  arg1: new FileInfo(textFile).Length);

WriteLine(File.ReadAllText(textFile));

SectionTitle("Writing to XML streams");

// define a file path to write to
string xmlFile = Combine(CurrentDirectory, "streams.xml");

// declare variables for the filestream and XML writer
FileStream? xmlFileStream = null;
XmlWriter? xml = null;

try
{
  // create a file stream
  xmlFileStream = File.Create(xmlFile);

  // wrap the file stream in an XML writer helper
  // and automatically indent nested elements
  xml = XmlWriter.Create(xmlFileStream,
    new XmlWriterSettings { Indent = true });

  // write the XML declaration
  xml.WriteStartDocument();

  // write a root element
  xml.WriteStartElement("callsigns");

  // enumerate the strings writing each one to the stream
  foreach (string item in Viper.Callsigns)
  {
    xml.WriteElementString("callsign", item);
  }

  // write the close root element
  xml.WriteEndElement();

  // close helper and stream
  xml.Close();
  xmlFileStream.Close();
}
catch (Exception ex)
{
  // if the path doesn't exist the exception will be caught
  WriteLine($"{ex.GetType()} says {ex.Message}");
}
finally
{
  if (xml != null)
  {
    xml.Dispose();
    WriteLine("The XML writer's unmanaged resources have been disposed.");
  }
  if (xmlFileStream != null)
  {
    xmlFileStream.Dispose();
    WriteLine("The file stream's unmanaged resources have been disposed.");
  }
}

// output all the contents of the file
WriteLine("{0} contains {1:N0} bytes.",
  arg0: xmlFile,
  arg1: new FileInfo(xmlFile).Length);
WriteLine(File.ReadAllText(xmlFile));

SectionTitle("Compressing streams");
Compress(algorithm: "gzip");
Compress(algorithm: "brotli");