美しいミズキ

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// See https://aka.ms/new-console-template for more information
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using System;
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using System.IO;
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using System.Text;
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namespace ConsoleTest;
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class Program
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{
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    public static void Main(string[] args)
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    {
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        string path = @"C:\write.py";
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        // 通过StreamReader读取文本文件
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        using (StreamReader reader = new StreamReader(
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                   path, // 文件路径
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                   Encoding.UTF8        // 编码格式
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                   ))
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        {
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            while (!reader.EndOfStream)
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            {
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                Console.WriteLine(reader.ReadLine());
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                // Console.WriteLine(reader.ReadLineAsync());
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                // Console.WriteLine(reader.ReadToEnd());
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            }
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        }
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    }
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}

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// 通过StreamWrite写入
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using (StreamWriter sw = new StreamWriter(
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            Path.Combine(path, "sw.txt"),
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            false, // 追加
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            System.Text.Encoding.UTF8
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        ))
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{
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    sw.Write("Hello\nWorld!\nHello\nCSharp\n");
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    sw.WriteLine("Hello World!\n");
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}

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// 通过FileStream读取任意文件字节流
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using (var file = new FileStream(
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            path,
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            FileMode.Open, // 模式
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            FileAccess.Read
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            ))
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{
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    byte[] buffer = new byte[file.Length];
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    // 读取内容到缓冲区
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    int bytesRead = file.Read(buffer, 0, buffer.Length);
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    foreach (byte b in buffer)
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    {
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        Console.WriteLine(b);
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    }
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    Console.WriteLine(bytesRead);
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}

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// 通过字节流写入文件
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using (var file = new FileStream(@"C:\Projects\C#\ConsoleTest\ConsoleTest\test.txt",
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            FileMode.Append,
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            FileAccess.Write
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            ))
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{
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    string tem = "Hello World\nNew Line\nHello CSharp\n";
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    byte[] data = Encoding.UTF8.GetBytes(tem);
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    file.Write(data, 0, data.Length);
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}
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return;

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string path = @"C:\Projects\C#\ConsoleTest\ConsoleTest\test.txt";
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// 通过File读取,写入文件
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var content = File.ReadAllText(path);
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Console.WriteLine(content);
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// 读取每一行
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var lines = File.ReadAllLines(path);
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foreach (var line in lines)
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{
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    Console.WriteLine(line);
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}
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// 写入文件
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File.WriteAllText(path, "Hello World\nNew Line\nHello CSharp\n");