c# - GZIPStream 压缩总是返回 10 个字节

Question

我正在尝试压缩我的 UWP 应用程序中的一些文本。我创建此方法是为了以后更容易:

public static byte[] Compress(this string s)
{
    var b = Encoding.UTF8.GetBytes(s);
    using (MemoryStream ms = new MemoryStream())
    using (GZipStream zipStream = new GZipStream(ms, CompressionMode.Compress))
    {
        zipStream.Write(b, 0, b.Length);
        zipStream.Flush(); //Doesn't seem like Close() is available in UWP, so I changed it to Flush(). Is this the problem?
        return ms.ToArray();
    }
}

但不幸的是，无论输入文本是什么，它总是返回 10 个字节。是因为我没有在 GZipStream 上使用 .Close() 吗？

Answer 1

您返回字节数据的时间过早。Close() 方法被 Dispose() 方法取代。因此 GZIP 流将仅在您离开 using(GZipStream) {} block 后 处理时写入。

public static byte[] Compress(string s)
{
    var b = Encoding.UTF8.GetBytes(s);
    var ms = new MemoryStream();
    using (GZipStream zipStream = new GZipStream(ms, CompressionMode.Compress))
    {
        zipStream.Write(b, 0, b.Length);
        zipStream.Flush(); //Doesn't seem like Close() is available in UWP, so I changed it to Flush(). Is this the problem?
    }

    // we create the data array here once the GZIP stream has been disposed
    var data    = ms.ToArray();
    ms.Dispose();
    return data;
}