C#-NGEN正在为.NET应用程序提供帮助,使其免受逆向工程的影响吗？如果没有,我什么时候使用它？

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如果Ngen不能保护我的应用程序,那么我合理地期望在职业生涯中使用该应用程序吗？

解决方法:

杰弗里·里希特(Jeffrey Richter)在他的书中写了一篇很棒的文章,我不知道第三版是否出版,但这是他在2002年的wrote关于Ngen’ing的一篇很棒的文章,至今仍然有意义.

强调：

Meanwhile, there are several potential
problems with respect to NGen’d files:

• No Intellectual Property Protection. Many people believe that
  it might be possible to ship NGend
  files without shipping the files
  containing the original IL code
  thereby keeping their intellectual
  property a secret. Unfortunately, this
  is not possible. At runtime, the CLR
  requires access to the assemblys
  metadata and the NGend files do not
  contain the metadata.

• NGend Files Can Get Out-Of-Sync. When the CLR loads an
  NGen’d file it compares a number of
  attributes about the
  previously-compile code and the
  current execution environment. If any
  of the attributes don’t match then the
  NGen’d file cannot be used and the
  normal JIT compiler process is used
  instead.

• Poor Administration. NGen’d file are not automatically deleted when an
  assembly is uninstalled adversely
  affecting the .NET Frameworks easy
  administration and XCOPY deployment
  story.

• Inferior Load-Time Performance (Rebasing). When Windows loads an
  NGend file, it checks to see if the
  file loads at its preferred base
  address. If the file cant load at its
  preferred base address, then Windows
  relocates the file, fixing-up all of
  the memory address references. This is
  extremely time consuming because
  Windows must load the entire file into
  memory and modify various bytes within
  the file. For more information about
  rebasing please see my book:
  Programming Applications for Microsoft
  Windows, 4th Edition (Microsoft
  Press).

Inferior Execution-Time Performance.

When compiling code, NGen cant make as many assumptions about the execution environment as the JIT compiler can. This causes NGen.exe to produce code with a number of memory-reference indirections that aren’t necessary for JIT compiled code

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