System.IO Namespace

Summary of Members

Type	Name	Description
Class	File	Provides static methods for the creation, copying, deletion, moving, and opening of files, and aids in their creation, deletion, and manipulation.
Class	Directory	Provides static methods for the creation, moving, and enumeration of directories and subdirectories.
Class	Path	Exposes static members for creating, manipulating, and resolving file and directory path strings.
Class	Stream	Abstract base class of the .NET Framework implementation of streams.
Class	FileStream	Exposes a stream around a file, supporting both synchronous and asynchronous read and write operations.
Class	StreamReader	Implements a System.Text.Decoder that decodes a byte stream into a sequence of characters.
Class	StreamWriter	Implements a System.Text.Encoder that encodes a sequence of characters into a byte stream.
Class	MemoryStream	Creates a stream that is backed by an in-memory buffer.
Class	BinaryReader	Reads primitive data types from a stream in binary format.
Class	BinaryWriter	Writes primitive types to a stream in binary format.
Class	DirectoryInfo	Provides instance methods for the creation, moving, and enumeration of directories and subdirectories.
Class	FileInfo	Provides instance methods for the creation, moving, and enumeration of files, and aids in their creation, deletion, and manipulation.
Class	IOException	The exception that is thrown when an I/O error occurs.
Enum	FileMode	Specifies how the operating system should open a file.
Enum	FileAccess	Specifies the access to which an object is opened.

Usage Example

Here's a simple example of how to write to and read from a file using the System.IO namespace:

using System;
using System.IO;

public class FileIOExample
{
    public static void Main(string[] args)
    {
        string filePath = "example.txt";
        string textToWrite = "Hello, System.IO!";

        // Write to the file
        try
        {
            using (StreamWriter writer = new StreamWriter(filePath))
            {
                writer.WriteLine(textToWrite);
                Console.WriteLine($"Successfully wrote to {filePath}");
            }
        }
        catch (IOException ex)
        {
            Console.WriteLine($"An error occurred while writing: {ex.Message}");
        }

        // Read from the file
        try
        {
            using (StreamReader reader = new StreamReader(filePath))
            {
                string line = reader.ReadLine();
                Console.WriteLine($"Read from file: {line}");
            }
        }
        catch (IOException ex)
        {
            Console.WriteLine($"An error occurred while reading: {ex.Message}");
        }
        finally
        {
            // Clean up the file
            if (File.Exists(filePath))
            {
                File.Delete(filePath);
                Console.WriteLine($"Deleted {filePath}");
            }
        }
    }
}

.NET Documentation

Summary of Members

Related Topics

Usage Example