C#中文件的读写与优化

以下是关于文件读写和优化的示例代码：

文件的读取：

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path_to_file.txt";

        // 一次性读取整个文件内容为字符串
        string fileContent = File.ReadAllText(filePath);
        Console.WriteLine(fileContent);

        // 按行读取文件内容为字符串数组
        string[] lines = File.ReadAllLines(filePath);
        foreach (string line in lines)
        {
            Console.WriteLine(line);
        }
    }
}

文件的写入：

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path_to_file.txt";

        // 写入字符串到文件
        string content = "Hello, World!";
        File.WriteAllText(filePath, content);

        // 写入字符串数组到文件
        string[] lines = { "Line 1", "Line 2", "Line 3" };
        File.WriteAllLines(filePath, lines);
    }
}

读取大文件的优化：

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path_to_large_file.txt";

        // 逐行读取大文件内容
        using (StreamReader reader = new StreamReader(filePath))
        {
            string line;
            while ((line = reader.ReadLine()) != null)
            {
                Console.WriteLine(line);
            }
        }
    }
}

写入大文件的优化：

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path_to_large_file.txt";

        // 逐行写入大文件内容
        using (StreamWriter writer = new StreamWriter(filePath))
        {
            writer.WriteLine("Line 1");
            writer.WriteLine("Line 2");
            writer.WriteLine("Line 3");
        }
    }
}

二进制文件的读写：

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "path_to_binary_file.bin";

        // 读取二进制文件
        using (BinaryReader reader = new BinaryReader(File.Open(filePath, FileMode.Open)))
        {
            int intValue = reader.ReadInt32();
            string stringValue = reader.ReadString();

            Console.WriteLine(intValue);
            Console.WriteLine(stringValue);
        }

        // 写入二进制文件
        using (BinaryWriter writer = new BinaryWriter(File.Open(filePath, FileMode.Create)))
        {
            int intValue = 123;
            string stringValue = "Hello, World!";

            writer.Write(intValue);
            writer.Write(stringValue);
        }
    }
}

异步文件读取：

using System;
using System.IO;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        string filePath = "path_to_large_file.txt";

        using (StreamReader reader = new StreamReader(filePath))
        {
            string line;
            while ((line = await reader.ReadLineAsync()) != null)
            {
                Console.WriteLine(line);
            }
        }
    }
}

上述代码提供了一些常见的文件读写操作和优化技巧的示例，你可以根据自己的需求进行修改和扩展。请替换path_to_file.txt和path_to_large_file.txt为实际的文件路径。