throwing exceptions

Question

User-1525009598 posted

what is the difference between throwing an exception, and just saying "throw", i.e.

throw ex;

vs

throw;

Answer 1

User-183374066 posted

throw ex resets the stack trace (so your errors would appear to originate from HandleException)
throw doesn't - the original offender would be preserved.

http://stackoverflow.com/questions/730250/is-there-a-difference-between-throw-and-throw-ex

Answer 2

User71929859 posted

When you throw an exception, then it reset the stacktrace and begin a new stracktrace from the point where exception occurs. When you do not specify any exception after the throw clause, it by default throw the current exception and does not reset the stack trace. Check below for mor detailed information

http://blogs.msdn.com/b/jmstall/archive/2007/02/15/throw-vs-rethrow.aspx?Redirected=true

Answer 3

User-760709272 posted

catch (Exception ex)
{
    // Both have the same result, only the first explicitly throws the exception that was caught
    // The second throws the exception that caused the catch block to fire
    throw ex;
    throw;
}

The explicit version of throw (the one where you throw an defined exception) is normally used when you want to generate an exception, or throw a different exception from the one caught.

int i = int.Parse(someText);
if (i < 1)
{
   throw new ApplicationException ("Invalid input");
}