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I have a couple questions about exceptions.
1) when you hit a catch block, swallowing means what exactly? I thought it was always rethrow or the existing exceptions is passed up to the next catch block.
2) If you add Exception.Data values to an excepction, I notice I have to do another throw; to grab that data futher up in another catch block later. Why?
Swallowing an exception normally means having a handling block for the exception, but not doing anything in the block. For example:
try { 3/0; } catch DivideByZeroException { //ignore } //Note: I know this really wont’ compile because the compiler is smart enough to not let you divide by a const of 0.
You have to rethrow because the first handler for an exception is the only one that will execute.
If you want the exception to bubble up you either don’t handle it or you rethrow it. By the way, it’s important to note that in .NET by just saying “throw” you’ll preserve the stack trace. If you “throw Exception” you’ll lose your stack trace.