C#的文件I/O操作是什么？如何读取和写入文本文件？

string content = File.ReadAllText("example.txt");

string[] lines = File.ReadAllLines("example.txt");

  using (var reader = new StreamReader("example.txt"))<br>
  {<br>
    string line;<br>
    while ((line = reader.ReadLine()) != null)<br>
    {<br>
      Console.WriteLine(line);<br>
    }<br>
  }
  

File.WriteAllText("output.txt", "Hello, World!");

string[] lines = { "第一行", "第二行" };<br>File.WriteAllLines("output.txt", lines);

  using (var writer = new StreamWriter("output.txt", true))<br>
  {<br>
    writer.WriteLine("这是追加的一行");<br>
  }