C#使用文本文件

string filePath = "example.txt";
string text = System.IO.File.ReadAllText(filePath);
string[] lines = System.IO.File.ReadAllLines(filePath);

string filePath = "example.txt";
string text = "This is an example text.";
System.IO.File.WriteAllText(filePath, text);
string[] lines = new string[] { "This is an example text.", "This is the second line." };
System.IO.File.WriteAllLines(filePath, lines);

string filePath = "example.txt";
using (System.IO.StreamReader reader = new System.IO.StreamReader(filePath))
{
    string line;
    while ((line = reader.ReadLine()) != null)
    {
        Console.WriteLine(line);
    }
}

string filePath = "example.txt";
using (System.IO.StreamWriter writer = new System.IO.StreamWriter(filePath))
{
    writer.WriteLine("This is an example text.");
    writer.WriteLine("This is the second line.");
}