zlib.Net的压缩和解压缩问题

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

namespace zlib_compress
{
    class Program
    {
        static void Main(string[] args)
        {
            using (FileStream fs = new FileStream("test.txt", FileMode.Open))
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using (ZlibStream zs = new ZlibStream(ms, CompressionMode.Compress, CompressionLevel.BestCompression))
                    {
                        fs.CopyTo(zs);
                    }

                    byte[] compressedData = ms.ToArray();

                    using (FileStream output = new FileStream("test.zlib", FileMode.Create))
                    {
                        output.Write(compressedData, 0, compressedData.Length);
                    }
                }
            }
        }
    }
}

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

namespace zlib_decompress
{
    class Program
    {
        static void Main(string[] args)
        {
            using (FileStream fs = new FileStream("test.zlib", FileMode.Open))
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using (ZlibStream zs = new ZlibStream(fs, CompressionMode.Decompress))
                    {
                        zs.CopyTo(ms);
                    }

                    byte[] decompressedData = ms.ToArray();

                    using (FileStream output = new FileStream("test_decompressed.txt", FileMode.Create))
                    {
                        output.Write(decompressedData, 0, decompressedData.Length);
                    }
                }
            }
        }
    }
}