/// <summary>
        /// 压缩算法
        /// </summary>
        /// <param name="pBytes"></param>
        /// <returns></returns>
        public static byte[] Compress(byte[] pBytes)
        {
            MemoryStream mMemory = new MemoryStream();
            Deflater mDeflater = new Deflater(Deflater.BEST_COMPRESSION);
            using (DeflaterOutputStream mStream = new DeflaterOutputStream(mMemory, mDeflater, 131072))
            {
                mStream.Write(pBytes, 0, pBytes.Length);
            }
            
            return mMemory.ToArray();
        }
        /// <summary>
        /// 解压缩算法
        /// </summary>
        /// <param name="pBytes"></param>
        /// <returns></returns>
        public static byte[] DeCompress(byte[] pBytes)
        {
            MemoryStream mMemory = new MemoryStream();
            using (InflaterInputStream mStream = new InflaterInputStream(new MemoryStream(pBytes)))
            {
                Int32 mSize;
                byte[] mWriteData = new byte[4096];
                while (true)
                {
                    mSize = mStream.Read(mWriteData, 0, mWriteData.Length);
                    if (mSize > 0)
                        mMemory.Write(mWriteData, 0, mSize);
                    else
                        break;
                }
            }
            return mMemory.ToArray();
        }

string sourceStr = "key=中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国中国";

 byte[] pBytes = System.Text.Encoding.UTF8.GetBytes(sourceStr);
pBytes = Compress(pBytes);
string result = Convert.ToBase64String(pBytes);
MessageBox.Show(result.Length)