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Editorial Team
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Asked: 2026-05-13T09:35:32+00:00

I have a .NET assembly which has defined a type T at compile time,

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I have a .NET assembly which has defined a type T at compile time, and I have instantiated an object my_t as an instance of this type.

I am wondering if it is possible in .NET to use the runtime compiler services to re-compile this class, then load the new class definition into the currently executing assembly, so when I call methods off of my_t, they will use the new code.

I am not changing the signatures of any of the methods, just the method bodies.

Any .NET gurus out there know if this is possible? Thanks in advance for any help!

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1 Answer

  1. Editorial Team

    A .NET object can’t change type at runtime; it’s a fundamental assumption in the CLR.

    A few suggestions:

    1. Write the code for T to forward calls to the right type as appropriate. It can forward to a type that gets compiled at runtime if you want to.
    2. Use some kind of aspect-orientated or dynamic proxy framework to automate (1) for you
    3. If this kind of forwarding isn’t suitable, I believe there is a .NET profiling API available to native that lets you intercept the JIT process. All I know of this is that tools like NCover are able to inject their own machine code this way.
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