C#: عمليات الإدخال/الإخراج للملفات

using System;
using System.IO;

string path = "test.txt";

File.WriteAllText(path, "Hello, World!");
string content = File.ReadAllText(path);
Console.WriteLine(content);

File.AppendAllText(path, "\nAppended line.");
string[] lines = File.ReadAllLines(path);
foreach (string line in lines)
{
    Console.WriteLine($"Line: {line}");
}

Console.WriteLine($"Exists: {File.Exists(path)}");

File.Copy(path, "copy.txt", overwrite: true);
File.Move("copy.txt", "moved.txt");
File.Delete("moved.txt");
File.Delete(path);

Hello, World!
Line: Hello, World!
Line: Appended line.
Exists: True

using System;
using System.IO;

string dir = "MyFolder";

Directory.CreateDirectory(dir);
Console.WriteLine($"Exists: {Directory.Exists(dir)}");

File.WriteAllText(Path.Combine(dir, "a.txt"), "aaa");
File.WriteAllText(Path.Combine(dir, "b.txt"), "bbb");

Directory.CreateDirectory(Path.Combine(dir, "SubDir"));

string[] files = Directory.GetFiles(dir);
Console.WriteLine("Files:");
foreach (string f in files)
{
    Console.WriteLine($"  {Path.GetFileName(f)}");
}

string[] dirs = Directory.GetDirectories(dir);
Console.WriteLine("Dirs:");
foreach (string d in dirs)
{
    Console.WriteLine($"  {Path.GetFileName(d)}");
}

Directory.Delete(dir, recursive: true);

Exists: True
Files:
  a.txt
  b.txt
Dirs:
  SubDir

using System;
using System.IO;

FileInfo fi = new FileInfo("demo.txt");
fi.WriteAllText("File info demo");
Console.WriteLine($"Name: {fi.Name}");
Console.WriteLine($"Length: {fi.Length}");
Console.WriteLine($"Extension: {fi.Extension}");
Console.WriteLine($"FullName: {fi.FullName}");
fi.Delete();

DirectoryInfo di = new DirectoryInfo("DemoDir");
di.Create();
Console.WriteLine($"Dir exists: {di.Exists}");
di.CreateSubdirectory("Child");
foreach (DirectoryInfo child in di.GetDirectories())
{
    Console.WriteLine($"Sub: {child.Name}");
}
di.Delete(recursive: true);

Name: demo.txt
Length: 14
Extension: .txt
FullName: ...\demo.txt
Dir exists: True
Sub: Child

using System;
using System.IO;
using System.Text;

string filePath = "data.bin";

using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
{
    byte[] data = Encoding.UTF8.GetBytes("FileStream demo");
    fs.Write(data, 0, data.Length);
}

using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
    byte[] buffer = new byte[fs.Length];
    fs.Read(buffer, 0, buffer.Length);
    Console.WriteLine(Encoding.UTF8.GetString(buffer));
}

File.Delete(filePath);

FileStream demo

using System;
using System.IO;

string path = "text.txt";

using (StreamWriter writer = new StreamWriter(path))
{
    writer.WriteLine("First line");
    writer.WriteLine("Second line");
    writer.Write("No newline here ");
    writer.Write("appended.");
}

using (StreamReader reader = new StreamReader(path))
{
    string? line;
    while ((line = reader.ReadLine()) != null)
    {
        Console.WriteLine(line);
    }
}

File.Delete(path);

First line
Second line
No newline here appended.

using System;
using System.IO;

string path = "binary.dat";

using (BinaryWriter bw = new BinaryWriter(File.Open(path, FileMode.Create)))
{
    bw.Write(42);
    bw.Write(3.14);
    bw.Write("hello");
}

using (BinaryReader br = new BinaryReader(File.Open(path, FileMode.Open)))
{
    int num = br.ReadInt32();
    double d = br.ReadDouble();
    string s = br.ReadString();
    Console.WriteLine($"Int: {num}, Double: {d}, String: {s}");
}

File.Delete(path);

Int: 42, Double: 3.14, String: hello

using System;
using System.IO;

string fullPath = Path.Combine("folder", "sub", "file.txt");
Console.WriteLine($"Combine: {fullPath}");
Console.WriteLine($"Extension: {Path.GetExtension(fullPath)}");
Console.WriteLine($"FileName: {Path.GetFileName(fullPath)}");
Console.WriteLine($"FileNameNoExt: {Path.GetFileNameWithoutExtension(fullPath)}");
Console.WriteLine($"DirectoryName: {Path.GetDirectoryName(fullPath)}");
Console.WriteLine($"TempPath: {Path.GetTempPath()}");

Combine: folder\sub\file.txt
Extension: .txt
FileName: file.txt
FileNameNoExt: file
DirectoryName: folder\sub
TempPath: ...\Temp\

using System;
using System.IO;

string path = "using_demo.txt";

using (StreamWriter sw = new StreamWriter(path))
{
    sw.WriteLine("Block using");
}

using StreamReader sr = new StreamReader(path);
Console.WriteLine(sr.ReadLine());

File.Delete(path);

Console.WriteLine(typeof(Stream).GetInterface("IDisposable") != null);

Block using
True