Consider a situation where I have three (or more) ways of performing a calculation, each of which can fail with an exception. In order to attempt each calculation until we find one that succeeds, I have been doing the following:
double val;
try { val = calc1(); }
catch (Calc1Exception e1)
{
try { val = calc2(); }
catch (Calc2Exception e2)
{
try { val = calc3(); }
catch (Calc3Exception e3)
{
throw new NoCalcsWorkedException();
}
}
}
Is there any accepted pattern which achieves this in a nicer way? Of course I could wrap each calculation in a helper method which returns null on failure, and then just use the ??
operator, but is there a way of doing this more generally (i.e. without having to write a helper method for each method I want to use)? I've thought about writing a static method using generics which wraps any given method in a try/catch and returns null on failure, but I'm not sure how I would go about this. Any ideas?
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