C# FileInfo
By FoxLearn 12/12/2024 3:47:58 AM 190
It allows you to create, copy, delete, move, and open files. Additionally, it helps in creating FileStream
objects for working with file data.
C# FileInfo Example
We create an instance of the FileInfo
class for the file 'sample.txt'. This object will allow you to retrieve details about the file.
var fi = new FileInfo("c:/dell/sample.txt"); // Create a FileInfo object for the specified file Console.WriteLine(fi.Name); // Print the file name (without the full path) Console.WriteLine(fi.FullName); // Print the full path of the file bool readOnly = fi.IsReadOnly; // Check if the file is read-only
Output:
sample.txt c:\dell\sample.txt false // If the file is not read-only
The IsReadOnly
property returns a boolean value (true
or false
) depending on whether the file is marked as read-only in the file system.
C# FileInfo create text file
The CreateText
method creates a StreamWriter
that is used to write to a new text file. If the file already exists, it will be overwritten.
var fi = new FileInfo("c:/dell/sample.txt"); // Create a FileInfo object for the file "sample.txt" using StreamWriter sw = fi.CreateText(); // Create a StreamWriter to write to the file (creates the file if it doesn't exist) sw.WriteLine("c# programming"); // Write the first line to the file sw.WriteLine("c# fileinfo"); // Write the second line to the file
We create a new text file called sample.txt
and write two lines of text into it. The StreamWriter
class implements the IDisposable
interface, so we use the using
statement to automatically close and release resources when done.
C# FileInfo read file
The OpenText
method creates a StreamReader
with UTF-8 encoding to read from an existing text file.
var fi = new FileInfo("c:/dell/sample.txt"); // Create a FileInfo object for the specified file using StreamReader streamReader = fi.OpenText(); // Open the file for reading text string? str = string.Empty; // Initialize a variable to store each line of text from the file while ((str = streamReader.ReadLine()) != null) // Loop through the file line by line { Console.WriteLine(str); // Print each line to the console }
In the example, we read a file line by line.
C# FileInfo delete file
You can use the Delete
method to delete a file.
var fi = new FileInfo("c:/dell/app.config"); // Create a FileInfo object for the file "app.config" try { fi.Delete(); // Attempt to delete the file } catch (UnauthorizedAccessException ex) { Console.WriteLine(ex.Message); }
In the example, we attempt to delete a system file, but an exception is thrown due to insufficient permissions.
C# FileInfo copy file
The CopyTo
method copies an existing file to a new location, preventing the overwriting of an existing file.
var fi = new FileInfo("C:\\Dell\\web.config"); // Create a FileInfo object for the source file fi.CopyTo("C:\\Dell\\app.config"); // Copy the file to the destination path
The example creates a copy of the web.config
file.
C# FileInfo Directory
The Directory
gets an instance of the parent directory.
var fi = new FileInfo("C:\\Dell\\Web.config");
var dir = fi.Directory; // This property returns a DirectoryInfo
object for the directory that contains the file.
Console.WriteLine(dir?.FullName); // This will print the full path of the directory that contains the file.
Console.WriteLine(dir?.LastAccessTime); // This will print the last access time of the directory.
Console.WriteLine(dir?.Root); // This will print the root directory of the drive where the file is located.
Output:
C:\Dell 12/12/2024 10:30:52 AM C:\
The example prints the file's parent directory's full name, last access time, and root directory.
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