Metro app中使用内存流压缩和解压

以前使用MemoryStream和DeflateStream进行压缩解压的操作，在Metro app中同样的代码不能执行了，winRT中提供了对应的封闭类，修改如下

        public static async Task<string> Compress(string strSource)
        {
            byte[] bytCompressed;
            using (var ms = new InMemoryRandomAccessStream())
            {
                byte[] buffer = Encoding.UTF8.GetBytes(strSource);
                IBuffer iBuffer = buffer.AsBuffer();
                using (var stream = new Compressor(ms.GetOutputStreamAt(0)))
                {
                    await stream.WriteAsync(iBuffer);
                    await stream.FlushAsync();
                    await stream.FinishAsync();
                    ms.Seek(0);
                    bytCompressed = new byte[ms.Size];

                    await ms.AsStream().ReadAsync(bytCompressed, 0, bytCompressed.Length);
                }
            }
            return Convert.ToBase64String(bytCompressed);
        }

        public static async Task<string> Decompress(string strSource)
        {
            string ret = string.Empty;
            using (var ms = new InMemoryRandomAccessStream())
            {
                byte[] byt = Convert.FromBase64String(strSource);
                await ms.WriteAsync(byt.AsBuffer());
                Decompressor stream = new Decompressor(ms.GetInputStreamAt(0));
                byte[] buffer = new byte[10000];
                IBuffer iBuffer = buffer.AsBuffer();
                var buff = await stream.ReadAsync(iBuffer, iBuffer.Length, InputStreamOptions.None);
                byte[] byts = buff.ToArray();
                ret = Encoding.UTF8.GetString(byts, 0, byts.Length);
            }
            return ret;
        }