C# Exception error question

Question

I'm a bit confused about this. Would a method with a try catch block, catch the error of another method that it calls? I'll do some example code...

 

 private void methodA()
{
   try
   {
      ...do some code
      methodB();
   }
   catch (exception e)
   {
      messagebox.show(e.message);
   }
}
 
private void methodB()
{
   do some code that errors...
}

So will methodA display the exception.message that methodB encountered? If not, can you explain how I would get it to?

Thanks
-Shifty

Sam Hobbs · Answer

One reason it would be better to catch the error in the method that encounters the exception is so you can provide a more meaningful message for diagnostic purposes and you might even be able to provide an error message for the user that might help resolve the problem.

Mahesh Chand · Answer

There is no downfall. However if you have some resources that are being created in MethodB you must release them. Here is an example in pseudocode: MethodB() { Create a File object Open file Do something with file and an exception raises. } You need to implement try..catch..finally block and in finally you need to release the resources. In the above case a File object is created and opened but not released. To release it in Finally block you need to release the file object. This is not crucial for general .NET objects but it a must for IO database connections and other system resources.

Roy S · Answer

I tried it and it worked it showed the message without crashing.

Jacob R · Answer

Would have been easier if I just tested it myself but I wasn't at my dev machine. Was talking to a friend about it and we both didn't know. I tested it and it works. I even called 5 methods from a chain and got the exception which is awesome. Is there any downfalls to doing it this way or is it a correct way to go about it? Reason I ask is because I would hate to have to change my project code which is around 23k lines.