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I want to reverse engineer an application written in C#. I would like to set a breakpoint at a function and observe the input passed to it during the normal course of the application's functioning.

In other words, I'd like to debug a DLL (written in C#) during the normal execution of the main executable and put a breakpoint at a particular function in the DLL file.

  • Please clarify your question. It is unclear what you're looking for. – tmr232 Oct 2 '19 at 8:44
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I've used dnSpy in production for debugging as it can be put on a USB. It's perfectly capable of decompiling and debugging dll's.

dnSpy screenshot

It has a pretty rich set of features. It's able to attach to running .net processes, decompile the code, edit variables at breakpoints and make some code changes on the fly.

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