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C# FileInfo Class: File Operations

The FileInfo class in C# is part of the System.IO namespace and provides methods and properties to perform various operations on files, such as reading, writing, and getting information about the file. In this tutorial, we'll go over some common file operations using the FileInfo class.

Before using the FileInfo class, make sure to include the following directive at the top of your file:

using System.IO;

Creating an instance of FileInfo:

To create a new instance of the FileInfo class, pass the file path as a parameter to the constructor:

string filePath = "example.txt";
FileInfo fileInfo = new FileInfo(filePath);

Creating a file:

To create a new file, use the Create method. If the file already exists, it will be overwritten:

using (FileStream fileStream = fileInfo.Create())
{
    // Do something with the file stream, e.g., write data to the file
}

Writing text to a file:

To write text to a file, first create a StreamWriter and then call its Write or WriteLine methods:

string content = "Hello, World!";

using (StreamWriter writer = fileInfo.CreateText())
{
    writer.WriteLine(content);
}

Appending text to a file:

To append text to an existing file, first create an StreamWriter with the AppendText method, and then call its Write or WriteLine methods:

string content = "This is an appended line.";

using (StreamWriter writer = fileInfo.AppendText())
{
    writer.WriteLine(content);
}

Reading text from a file:

To read the contents of a file as a string, use the StreamReader class:

using (StreamReader reader = fileInfo.OpenText())
{
    string content = reader.ReadToEnd();
    Console.WriteLine("File content:");
    Console.WriteLine(content);
}

Checking if a file exists:

To check if a file exists, use the Exists property:

if (fileInfo.Exists)
{
    Console.WriteLine("The file exists.");
}
else
{
    Console.WriteLine("The file does not exist.");
}

Deleting a file:

To delete a file, use the Delete method:

if (fileInfo.Exists)
{
    fileInfo.Delete();
    Console.WriteLine("File deleted.");
}
else
{
    Console.WriteLine("The file does not exist.");
}

Moving or renaming a file:

To move a file to a new location or rename it, use the MoveTo method:

string destinationFilePath = "example_renamed.txt";
fileInfo.MoveTo(destinationFilePath);

Getting file information:

The FileInfo class provides various properties to get information about the file:

Name: Gets the file name.
Length: Gets the file size in bytes.
DirectoryName: Gets the directory where the file is located.
Extension: Gets the file extension.
CreationTime: Gets or sets the creation time of the file.
LastAccessTime: Gets or sets the last access time of the file.
LastWriteTime: Gets or sets the last write time of the file.

In this tutorial, we've covered some common file operations using the FileInfo class in C#. By using the methods and properties provided by the FileInfo class, you can easily create, read, update, and delete files, as well as get information about the file in your C# applications.

Working with files using C# FileInfo:

Description: The FileInfo class is part of the System.IO namespace and allows you to perform file-related operations in an object-oriented manner.

Code:

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "example.txt";

        // Create a FileInfo object
        FileInfo fileInfo = new FileInfo(filePath);

        // Check if the file exists
        if (fileInfo.Exists)
        {
            // Perform file operations using FileInfo
            Console.WriteLine($"File '{fileInfo.FullName}' exists!");
        }
        else
        {
            Console.WriteLine($"File '{fileInfo.FullName}' does not exist.");
        }
    }
}

Reading and writing files with FileInfo in C#:

Description: Use FileInfo.OpenText for reading and FileInfo.CreateText for writing text files.

Code:

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "example.txt";

        // Create a FileInfo object
        FileInfo fileInfo = new FileInfo(filePath);

        // Writing to a file
        using (StreamWriter writer = fileInfo.CreateText())
        {
            writer.WriteLine("Hello, FileInfo!");
        }

        // Reading from a file
        using (StreamReader reader = fileInfo.OpenText())
        {
            string content = reader.ReadToEnd();
            Console.WriteLine($"File content: {content}");
        }
    }
}

Appending to a file with FileInfo in C#:

Description: Use FileInfo.AppendText to append content to an existing file using FileInfo.

Code:

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "example.txt";

        // Create a FileInfo object
        FileInfo fileInfo = new FileInfo(filePath);

        // Append to a file
        using (StreamWriter writer = fileInfo.AppendText())
        {
            writer.WriteLine("\nAppended content with FileInfo.");
        }

        // Reading from the file after appending
        using (StreamReader reader = fileInfo.OpenText())
        {
            string content = reader.ReadToEnd();
            Console.WriteLine($"File content after appending: {content}");
        }
    }
}

Deleting files using FileInfo in C#:

Description: Use the FileInfo.Delete method to delete a file using FileInfo.

Code:

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "example.txt";

        // Create a FileInfo object
        FileInfo fileInfo = new FileInfo(filePath);

        // Delete the file
        fileInfo.Delete();

        Console.WriteLine($"File '{fileInfo.FullName}' deleted.");
    }
}

Renaming files with C# FileInfo class:

Description: Use the FileInfo.MoveTo method to rename or move a file using FileInfo.

Code:

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string oldFilePath = "old.txt";
        string newFilePath = "new.txt";

        // Create FileInfo objects
        FileInfo oldFileInfo = new FileInfo(oldFilePath);
        FileInfo newFileInfo = new FileInfo(newFilePath);

        // Rename the file
        oldFileInfo.MoveTo(newFileInfo.FullName);

        Console.WriteLine($"File renamed from '{oldFileInfo.FullName}' to '{newFileInfo.FullName}'.");
    }
}