Uses methods in the File class to check whether a file exists

 
/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/

// Exists.cs -- Uses methods in the File class to dheck whether a file exists.
//              If it exists, it then opens and reads the file to the console.
//
//              Compile this program with the following command line
//                  C:>csc Exists.cs
using System;
using System.IO;

namespace nsStreams
{
    public class Exists
    {
        static public void Main (string [] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine ("Please enter a file name");
                return;
            }
            if (!File.Exists (args[0]))
            {
                Console.WriteLine (args[0] + " does not exist");
                return;
            }
            StreamReader reader;
            try
            {
                reader = File.OpenText (args[0]);
            }
            catch (Exception e)
            {
                Console.WriteLine (e.Message);
                Console.WriteLine ("Cannot open " + args[0]);
                return;
            }
            while (reader.Peek() >= 0)
            {
                Console.WriteLine (reader.ReadLine ());
            }
            reader.Close ();
        }
    }
}

Related examples in the same category

1.	Get file Creation Time
2.	Delete a file
3.	Get File Access Control
4.	illustrates the FileAttributes enumeration
5.	illustrates the FileInfo class
6.	illustrates the FileSystemWatcher class
7.	File class to check whether a file exists, open and read
8.	Uses methods in the File class to check the status of a file
9.	File Class
10.	File.AppendAllLines Method Appends lines to a file, and then closes the file.
11.	File.AppendAllText Opens a file, appends the specified string to the file
12.	File.AppendAllText Method Appends the string to the file, creating the file if it does not exist.
13.	File.AppendText Creates a StreamWriter that appends UTF-8 encoded text to an existing file.
14.	File.Copy Method Copies file to a new file
15.	File.Create Creates or overwrites a file in the specified path.
16.	File.Create Method (String, Int32) Creates or overwrites the specified file.
17.	File.CreateText Method Creates or opens a file for writing UTF-8 encoded text.
18.	File.Decrypt Decrypts a file
19.	File.Exists Determines whether the specified file exists.
20.	File.GetAccessControl Gets a FileSecurity object that encapsulates the access control list
21.	File.GetAttributes Method Gets the FileAttributes of the file on the path.
22.	File.GetCreationTime Method Returns the creation date and time of the specified file or directory.
23.	File.GetLastAccessTime Method Returns the date and time the specified file or directory was last accessed.
24.	File.GetLastWriteTime Returns the date and time the specified file or directory was last written to.
25.	File.Move Moves a file to a new location
26.	File.Open Opens a FileStream on the specified path with read/write access.
27.	File.Open Method (String, FileMode, FileAccess)
28.	File.Open Method (String, FileMode, FileAccess, FileShare)
29.	File.OpenRead Method Opens an existing file for reading.
30.	File.OpenText Method Opens an existing UTF-8 encoded text file for reading.
31.	File.OpenWrite Method Opens an existing file or creates a new file for writing.
32.	File.ReadAllLines Method Opens a text file, reads all lines of the file, and then closes the file.
33.	File.ReadAllLines Method (String, Encoding)
34.	File.ReadLines Method
35.	File.Replace Replaces contents of file
36.	File.SetLastAccessTime Sets the date and time the specified file was last accessed.
37.	File.SetLastWriteTime

Uses methods in the File class to check whether a file exists : File « File Stream « C# / C Sharp

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