[code snippet] 生成随机大文件

一个无聊的测试代码，因为要测试大文件的网络传输，就写了一个随机大文件生成脚本，做个备份。

基本上都是 GPT 生成的，哈哈。

C# 代码

csharp 复制代码

namespace ConsolePlayground;

internal class BigFileGenerater
{

    public async Task Run()
    {
        Console.WriteLine("大文件生成工具，输入要生成的文件大小，单位 GB");
        Console.WriteLine();
        var input = Console.ReadLine();
        if (string.IsNullOrWhiteSpace(input))
        {
            return;
        }
        if (!double.TryParse(input.Trim(), out var size))
        {
            return;
        }

        if (size <= 0 || size > 1000)
        {
            throw new ArgumentOutOfRangeException("size");
        }
        var byteSize = size * 1024 * 1024 * 1024;

        var folder = Environment.CurrentDirectory;
        Console.WriteLine($"将在当前目录 {folder} 生成 {size} GB 的文件");
        Console.WriteLine("是否继续? Y/N");

        input = Console.ReadLine();
        if (string.IsNullOrWhiteSpace(input))
        {
            return;
        }
        if (input.Trim().ToUpper() != "Y")
        {
            return;
        }

        Console.WriteLine("开始生成...");
        await Genetate(folder, byteSize);
        Console.WriteLine("结束生成");
    }

    private async Task Genetate(string folder, double size)
    {
        var file = Path.Combine(folder, $"TEMP_{DateTime.Now:yyyyMMddHHmmss.fff}.tmp");

        using var fileStream = new FileStream(file, FileMode.OpenOrCreate);
        var rng = new Random();
        int step = 1024 * 1024;
        int count = (int)Math.Ceiling(size / step);

        for (int i = 0; i < count; i++)
        {
            byte[] bytesToWrite = GenerateRandomBytes(rng, step);
            await fileStream.WriteAsync(bytesToWrite, 0, step);
            await fileStream.FlushAsync();
        }
    }

    public static byte[] GenerateRandomBytes(Random rng, int length)
    {
        var randomBytes = new byte[length];
        rng.NextBytes(randomBytes);
        return randomBytes;
    }
}