C# MemoryStream转GZipStream 到文件

压缩：

public static void MemoryStreamCompress(string fileName, MemoryStream memStream)
        {
            FileStream fsWrite = File.OpenWrite(fileName);

            byte[] bytes = new byte[1 * 1024 * 1024];
            GZipStream compressedzipStream = new GZipStream(fsWrite, CompressionMode.Compress);

            memStream.Position = 0;

            while(true)
            {
                int len = memStream.Read(bytes, 0, bytes.Length);

                if (len > 0)
                    compressedzipStream.Write(bytes, 0, len);
                else
                    break;
            }

            compressedzipStream.Close(); 
        }

解压

public static MemoryStream MemoryStreamDeCompress(string fileName)
        {
            FileStream fsRead = File.OpenRead(fileName);

            byte[] bytes = new byte[1 * 1024 * 1024];
            MemoryStream memStream = new MemoryStream();

            GZipStream DecompressedzipStream = new GZipStream(fsRead, CompressionMode.Decompress);

            while (true)
            {
                int len = DecompressedzipStream.Read(bytes, 0, bytes.Length);
                if (len > 0)
                    memStream.Write(bytes, 0, len);
                else
                    break;
            }
            DecompressedzipStream.Close();

            memStream.Position = 0;

            return memStream;
        }

如果是对象的话，可以直接对象序列化到GZipStream 的，相关代码涉及到公司就不放了，原理就是序列化时把 ：MemoryStream做参数 传入GZipStream，然后GZipStream传入序列化函数，如果要获取流的大小，流close掉不能用流对象.Length，需要流对象.ToArray().Length才可以。