反射调用方法解密

try
            {
                Assembly assembly = Assembly.LoadFile(txtAssemblyPath.Text);//加载指定程序集
                if (assembly != null)
                {
                    if (assembly.FullName.Contains("actmp,"))//看看是不是Sixxpack压缩过的程序集
                    {
                        Type compressorClass = assembly.GetType("Sixxpack.Compressor");//得到Compressor方法的类型
                        MethodInfo DecompressInfo = compressorClass.GetMethod("Decompress");//Decompress方法，供后面使用
                        int orig = Convert.ToInt32(assembly.GetType("Sixxpack.stub").GetField("orig", BindingFlags.NonPublic | BindingFlags.Static).GetValue(null));//压缩后的程序集的偏移量，我虽然强烈怀疑就是0x8000，为了保险起见，还是反射出来吧。

                        #region 这段照抄Main方法的内容
                        MemoryStream inStream = new MemoryStream();
                        Stream stream2 = assembly.GetFiles()[0];//这么写就可以了
                        stream2.Position = orig;
                        byte[] buffer = new byte[stream2.Length - orig];
                        stream2.Read(buffer, 0, Convert.ToInt32(buffer.Length));
                        inStream.Write(buffer, 0, buffer.Length);
                        inStream.Seek(0L, SeekOrigin.Begin);
                        #endregion

                        byte[] data = (byte[])DecompressInfo.Invoke(Activator.CreateInstance(compressorClass), new object[] { inStream });//调用Decompress方法，获得原始程序集的数据
                        if (sfdAssembly.ShowDialog() == DialogResult.OK)
                        {
                            sfdAssembly.OpenFile().Write(data, 0, data.Length);//把数据保存到指定文件，OK，完工！
                        }
                        MessageBox.Show("文件解压成功!", "恭喜", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                    {
                        MessageBox.Show("未找到正确的程序集!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                    }
                }
                else
                {
                    MessageBox.Show("该文件没有程序集!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Hand);
            }