File I/O Using Windows File System C#....

C# - Windows File System:

C# allows you to work with directories and files using various directory and file related classes like , the DirectoryInfo class and the FileInfo class.

The DirectoryInfo Class:

The DirectoryInfo class is derived from the FileSystemInfo class. it have various method for creating , moving , and browsing , through directories and subdirectories. this class can not be inherited.

some commonly used properties of the DirectoryInfo class:

1. Attributes  >> Gets the attributes for the current file or directory.
2. CreationTime >> Gets the creation time of current file or directory.
3. Exists >> gets a Boolean value indicating whether the directory exists.
4. Extension >> Gets the string representing the file extension.
5. FullName >> Gets the full path of the directory or file.
6. LastAccessTime >> Gets the time the current file or directory was last accessed.
7. Name >> Gets the name of this DirectoryInfo instance.

Some commonly used methods of the DirectoryInfo class:

1. Create()  >> Creates a directory.
2. CreateSubDirectory(string) >> Create a subdirectory  and subdirectories on the specified path can be relative to this instance of the directory class.
3. Delete() >> Delete directory info if its empty.
4. GetDirectories() >> return the subdirectories of the current directories.
5. GetFiles() >> return a file list from the current directory.

 

The FIleInfo Class:

The FileInfo Class is derived from the FileSystemInfo class. it has properties and instance method  for creating , copying , moving , and opening of files , and helps in the creation of FileStream object. this class cannot be inherit.

some commonly used properties of the FileInfo class:

Attributes  >> Gets the attributes for the current file.

CreationTime >> Gets the creation time of current file.

Exists >> gets a Boolean value indicating whether the file exists.

Extension >> Gets the string representing the file extension.

FullName >> Gets the full path of the file.

LastAccessTime >> Gets the time the current file was last accessed.

Name >> Gets the name of this file instance.

Directory >> Gets an instance of an directory which the file belongs.

LastWriteTime >> gets the time of the last written activity of the file.

length >> Gets the size , in bytes , of the current files.

Name >> Gets the name of the file.

some commonly used method of FileInfo class:

1. AppendText()  >> Create a StreamWriter that appends text to the file represented by this instance of the FileInfo.
2. Create()  >> create a file.
3. Delete()  >> deletes a file permanently.
4. MoveTo(string destFilename) >> moves a specific file to the new location , providing the option to specify a new file name.
5. Open(FileMode mode, FileAccess access, FileShare share)  >> opens a file in specified mode with read , write or read/write access and the specified sharing option.
6. OpenRead()  >> creates a read only FileStream.
7. OpenWrite()  >> creates a write only FileStream.

the following example demonstrate the use of DirectoryInfo class :

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace directoryinfo_class.cs

{

    class Program

    {

        static void Main(string[] args)

        {

            DirectoryInfo mydirinfo = new DirectoryInfo("C:");

            Console.WriteLine("full name of the directory is :"+ mydirinfo.FullName);

            Console.WriteLine("the directory was last accessed on :"+ mydirinfo.LastAccessTime.ToString());

            Console.ReadKey();

        }

    }

}

output:

the following example demonstrate the use of FileInfo class :

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace fileinfo_classes.cs

{

    class Program

    {

        static void Main(string[] args)

        {

            // creating an instance of directoryinfo class

            DirectoryInfo mydirinfo = new DirectoryInfo("C:");

            // set all the files in the directory and print their name and size

            FileInfo[] fileindir = mydirinfo.GetFiles();

            foreach (FileInfo file in fileindir)

            {

                    Console.WriteLine("file name : " + file.Name + " extension :" + file.Extension + " size : " + file.Length + "bytes");

            }

            Console.ReadKey();

        }

    }

}

output :

reference link :

implementing File IO using DirectoryInfo class C#

implementing File IO using FileInfo class C#