C# 시작하기 - System.IO.File

System.IO.File is a class in the .NET framework that provides static methods for the creation, copying, deletion, moving, and opening of files. It also helps in reading and writing to files. Let's take a look at some commonly used methods of the File class:

Common Methods:

1. Create:

   // Creates or overwrites a file in the specified path
   using (FileStream fs = File.Create("path/to/file.txt"))
   {
       // You can write to the file here
   }

2. Copy:

   // Copies a file to a new location
   File.Copy("path/to/source.txt", "path/to/destination.txt");

3. Delete:

   // Deletes the specified file
   File.Delete("path/to/file.txt");

4. Move:

   // Moves a file to a new location
   File.Move("path/to/source.txt", "path/to/destination.txt");

5. ReadAllText:

   // Reads all text from a file
   string content = File.ReadAllText("path/to/file.txt");
   Console.WriteLine(content);

6. WriteAllText:

   // Writes text to a file, overwriting the file if it exists
   File.WriteAllText("path/to/file.txt", "Hello, World!");

7. Exists:

   // Checks if the specified file exists
   if (File.Exists("path/to/file.txt"))
   {
       Console.WriteLine("File exists.");
   }
   else
   {
       Console.WriteLine("File does not exist.");
   }

Example Usage:

Here’s a quick example demonstrating the creation, writing, reading, and deletion of a file:

using System;
using System.IO;

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

        // Create a file and write text to it
        File.WriteAllText(filePath, "Hello, C# File Handling!");

        // Read the text from the file
        string content = File.ReadAllText(filePath);
        Console.WriteLine("File Content: " + content);

        // Check if the file exists
        if (File.Exists(filePath))
        {
            Console.WriteLine("The file exists.");
        }

        // Delete the file
        File.Delete(filePath);
        Console.WriteLine("File deleted.");
    }
}

This example demonstrates how to create a file, write text to it, read the text, check for its existence, and delete it.