When you catch an exception in an exception handler, you have the option of executing some code and then re-throwing the exception. When you re-throw an exception from a handler, code that called the current method has the option of also handling the exception. Alternatively, if no higher-level handler exists, the exception will be treated as an unhandled exception after you re-throw it.
In the example below, DoSomeStuff catches all exceptions, writes information to a log file and then re-throws the exception.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | private const string MyLogFile = "App1.log";static void Main(string[] args){ Console.WriteLine("About to do some stuff"); try { DoSomeStuff(); } catch (Exception xx) { Console.WriteLine(xx.ToString()); } Console.ReadLine();}static void DoSomeStuff(){ try { Dog d1 = new Dog("Jack", 15); Dog d2 = new Dog("Kirby", 150); } catch (Exception xx) { StreamWriter sw = new StreamWriter(MyLogFile, true); // append sw.WriteLine(string.Format("Exception at {0}", <span class="skimlinks-unlinked">DateTime.Now</span>)); sw.WriteLine(xx.ToString()); <span class="skimlinks-unlinked">sw.Close</span>(); throw; // Re-throw }} |
