Initial commit

vs4win/Chapter09/WorkingWithStreams/Program.cs

@@ -0,0 +1,94 @@
+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");