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What exactly is a first chance exception? How and where does it originate in a .NET program? And why is it called by that peculiar name (what 'chance' are we talking about)?
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first-chance exception (plural first-chance exceptions) (computing) An exception (error condition) when handled by a debugger, such that the programmer has the first chance to study it; such an exception would otherwise proceed to a handler or (in its absence) crash the program.
If the application does not handle the exception, the debugger is re-notified. This is known as a "second chance" exception. The debugger again suspends the application and determines how to handle this exception.
Applies to: Visual Studio Visual Studio for Mac Visual Studio Code. An exception is an indication of an error state that occurs while a program is being executed.
In Visual Studio, when exceptions are thrown or end up unhandled, the debugger can help you debug these by breaking just like it breaks when a breakpoint is hit.
It's a debugging concept. Basically exceptions are thrown to the debugger first and then to the actual program where if it isn't handled it gets thrown to the debugger a second time, giving you a chance to do something with it in your IDE before and after the application itself. This appears to be a Microsoft Visual Studio invention.
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First chance exception notifications are raised when an exception is thrown. Second chance notifications are when it is not caught. (Chance – as in opportunity to break into the code in the debugger).
First and second chance exception handling
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