C# 读取和写入txt文件

在C#中，读取和写入文本文件（txt或其他纯文本文件）非常直观，可以使用`StreamReader`和`StreamWriter`这两个内置类。以下是基本步骤：

**读取txt文件：**

using System.IO;

string filePath = "path_to_your_file.txt"; // 替换为你的文件路径

try
{
    using (StreamReader reader = new StreamReader(filePath))
    {
        string line;
        while ((line = reader.ReadLine()) != null)
        {
            Console.WriteLine(line); // 打印每一行内容
        }
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Error reading file: {ex.Message}");
}

**写入txt文件：**

using System.IO;

string filePath = "path_to_your_file.txt"; // 替换为你要写入的文件路径
string contentToWrite = "This is some text to write into the file.\n";

try
{
    using (StreamWriter writer = new StreamWriter(filePath, true)) // 如果文件已存在，追加内容；如果不存在，创建新文件
    {
        writer.WriteLine(contentToWrite);
    }
    Console.WriteLine("Content written successfully.");
}
catch (Exception ex)
{
    Console.WriteLine($"Error writing to file: {ex.Message}");
}