如何将流保存到C#中的文件？

using System;
using System.IO;

namespace SaveStreamToFile
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建一个流
            Stream stream = new MemoryStream();

            // 将数据写入流
            byte[] data = new byte[] { 1, 2, 3, 4, 5 };
            stream.Write(data, 0, data.Length);

            // 将流保存到文件
            string filePath = "output.txt";
            using (FileStream fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
            {
                stream.Seek(0, SeekOrigin.Begin);
                stream.CopyTo(fileStream);
            }

            Console.WriteLine($"Stream saved to {filePath}");
        }
    }
}