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How do exceptions work (behind the scenes) in C#

Asked 2010-09-21T14:42:27.497
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Identical to "How do exceptions work (behind the scenes) in C++", but for C#.

I know that the steps below have to be performed when an exception is thrown.

  1. Find the nearest handler for the exception type;
  2. Unwind the stack up to the handler level;
  3. Call the handler;
  4. Find and call every finally blocks.

How does .NET handles these operations? How does the mapping for the "current" handlers work? How much code is emitted in a try/catch block? And in a throw block?

c# .net exception try-catch throw
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.NET exceptions use the underlying Windows structured exception handling implementation, though this is not a requirement. Mono may do it differently.

In fact, if you write a single-line Console app that just throws an exception, and then run it in Windbg, you'll see the hook into the unmanaged exception handling.

answered 2010-09-21T14:51:17.460

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