Try something like this: try { $w = New-Object net.WebClient $d = $w.downloadString(‘http://foo’) } catch [Net.WebException] { Write-Host $_.Exception.ToString() } The exception is in the $_ variable. You might explore $_ like this: try { $w = New-Object net.WebClient $d = $w.downloadString(‘http://foo’) } catch [Net.WebException] { $_ | fl * -Force } I think it … Read more
Instead of guessing, I decided to actually look at the generated code with a small piece of C++ code and a somewhat old Linux install. class MyException { public: MyException() { } ~MyException() { } }; void my_throwing_function(bool throwit) { if (throwit) throw MyException(); } void another_function(); void log(unsigned count); void my_catching_function() { log(0); try … Read more
If any of the code in the try block can throw a checked exception, it has to appear in the throws clause of the method signature. If an unchecked exception is thrown, it’s bubbled out of the method. The finally block is always executed, whether an exception is thrown or not.
Starting with 2.0 a StackOverflow Exception can only be caught in the following circumstances. The CLR is being run in a hosted environment* where the host specifically allows for StackOverflow exceptions to be handled The stackoverflow exception is thrown by user code and not due to an actual stack overflow situation (Reference) *“hosted environment” as … Read more
Finally always executes. That’s what it’s for, which means its return value gets used in your case. You’ll want to change your code so it’s more like this: function example() { var returnState = false; // initialization value is really up to the design try { returnState = true; } catch { returnState = false; … Read more
No, it’s not a bad practice. Putting return where it makes sense improves readability and maintainability and makes your code simpler to understand. You shouldn’t care as finally block will get executed if a return statement is encountered.
Check it. static public void Main(string[] args) { Stopwatch w = new Stopwatch(); double d = 0; w.Start(); for (int i = 0; i < 10000000; i++) { try { d = Math.Sin(1); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } } w.Stop(); Console.WriteLine(w.Elapsed); w.Reset(); w.Start(); for (int i = 0; i < 10000000; i++) { … Read more
You should prefer try/except over if/else if that results in speed-ups (for example by preventing extra lookups) cleaner code (fewer lines/easier to read) Often, these go hand-in-hand. speed-ups In the case of trying to find an element in a long list by: try: x = my_list[index] except IndexError: x = ‘NO_ABC’ the try, except is … Read more
That is R’s way of printing a zero length vector (an integer one), so you could test for a being of length 0: R> length(a) [1] 0 It might be worth rethinking the strategy you are using to identify which elements you want, but without further specific details it is difficult to suggest an alternative … Read more
A try without a catch clause sends its error to the next higher catch, or the window, if there is no catch defined within that try. If you do not have a catch, a try expression requires a finally clause. try { // whatever; } finally { // always runs }