io/file-demo/file.cs - A demonstration of the File class.

Lecture 10 - slide 26 : 40 Program 3

using System;
using System.IO;

public class FileDemo{

  public static void Main(){

    // Setup file names
    string fileName = "file.cs",             // this source file
           fileNameCopy = "fileCopy.cs";

    // Does this source file exist?
    Console.WriteLine("{0} does {1} exist", 
                      fileName, File.Exists(fileName) ? "" : "not");

    // Copy this source file
    File.Copy(fileName, fileNameCopy);

    // Does the copy exist?
    Console.WriteLine("{0} does {1} exist", 
                      fileNameCopy, 
                     File.Exists(fileNameCopy) ? "" : "not");

    // Delete the copy again
    Console.WriteLine("Deleting {0}", fileNameCopy);
    File.Delete(fileNameCopy);

    // Does the deleted file exist
    Console.WriteLine("{0} does {1} exist", 
                      fileNameCopy, 
                      File.Exists(fileNameCopy) ? "" : "not");

    // Read all lines in source file and echo 
    // one of them to the console
    string[] lines = File.ReadAllLines(fileName);
    Console.WriteLine("Line {0}: {1}", 6, lines[6]);

  }

}