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Asked: 2026-05-16T20:14:51+00:00

I understand how to mock interfaces or virtual method calls. But frameworks like TypeMock

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I understand how to mock interfaces or virtual method calls. But frameworks like TypeMock can mock everything in the framework. Which .NET mechanisms are used to provide such functions?

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  1. Editorial Team

    Typemock Isolator for example uses the CLR profiler API to intercept .NET calls and change them during runtime:

    Quote:

    Typemock Isolator uses an
    aspect-oriented programming design
    that creates a mock aspect.
    Internally, it uses the .NET Framework
    profiler API to monitor an
    application’s execution. When a method
    is loaded by the CLR, Typemock
    Isolator retrieves the IL and replaces
    it with instrumented IL code. Typemock
    Isolator does not change your original
    IL code, it simply inserts new code
    that calls the Typemock Isolator
    framework and returns mocked values.

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