使用System.IO.Compression在内存中创建ZIP存档

using System;
using System.IO;
using System.IO.Compression;

class Program
{
    static void Main()
    {
        // 创建一个内存流
        using (MemoryStream memoryStream = new MemoryStream())
        {
            // 使用 ZipArchive 在内存流中创建 ZIP 存档
            using (ZipArchive zipArchive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
            {
                // 创建一个新的 ZIP 存档项
                ZipArchiveEntry entry = zipArchive.CreateEntry("example.txt");

                // 获取 ZIP 存档项的写入流
                using (StreamWriter writer = new StreamWriter(entry.Open()))
                {
                    // 写入数据到 ZIP 存档项
                    writer.WriteLine("Hello, World!");
                }
            }

            // 将内存流的内容保存到文件（仅用于演示，实际应用中可能不需要这一步）
            File.WriteAllBytes("example.zip", memoryStream.ToArray());
        }
    }
}

using System;
using System.IO;
using System.IO.Compression;

class Program
{
    static void Main()
    {
        string sourceFilePath = "largefile.txt";
        string destinationFilePath = "largefile.zip";

        using (FileStream sourceStream = new FileStream(sourceFilePath, FileMode.Open))
        using (FileStream destinationStream = new FileStream(destinationFilePath, FileMode.Create))
        using (GZipStream gzipStream = new GZipStream(destinationStream, CompressionMode.Compress))
        {
            sourceStream.CopyTo(gzipStream);
        }
    }
}