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

Lecture 10 - slide 26 : 40 Program 1

using System;
using System.IO;

public class FileInfoDemo{

  public static void Main(){
    // Setting up file names
    string fileName = "file-info.cs",
           fileNameCopy = "file-info-copy.cs";

    // Testing file existence
    FileInfo fi = new FileInfo(fileName); // this source file
    Console.WriteLine("{0} does {1} exist", 
                      fileName, fi.Exists ? "" : "not");

    // Show file info properties:
    Console.WriteLine("DirectoryName: {0}", fi.DirectoryName);
    Console.WriteLine("FullName: {0}", fi.FullName);
    Console.WriteLine("Extension: {0}", fi.Extension);
    Console.WriteLine("Name: {0}", fi.Name);
    Console.WriteLine("Length: {0}", fi.Length);
    Console.WriteLine("CreationTime: {0}", fi.CreationTime);

    // Copy one file to another
    fi.CopyTo(fileNameCopy);
    FileInfo fiCopy  = new FileInfo(fileNameCopy);

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

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

    // Create new FileInfo object for the copy
    FileInfo fiCopy1  = new FileInfo(fileNameCopy);
    // Check if the copy exists?
    Console.WriteLine("{0} does {1} exist", fileNameCopy, 
                      fiCopy1.Exists ? "" : "not"); 

    // Achieve a TextReader (StreamReader) from the file info object
    // and echo the first ten lines in the file to standard output  
    using(StreamReader sr = fi.OpenText()){
      for (int i = 1; i <= 10; i++)
        Console.WriteLine("  " + sr.ReadLine());
    }
  }
}