So if you do expect situations where a key may not be found then you can account for it with these methods. But you can avoid that by using either the Dictionary.Lookup (to apply a default if the key is not found) or the Dictionary.HasKey methods.
If the key is not found you'll get a KeyNotFoundException. For example, with a Dictionary you use the Value method to fetch a value based on a key. One reason is that when testing, the Debugger is displayed for any event that is raised if you have "Break On Exceptions" enabled in the Project menu. Since exceptions are for unexpected behavior, if you are able to avoid an error by preventing the exception from occurring then it is more efficient to do so. To do this, select Project ↠ Break On Exceptions in the menu so that it has a checkmark next to it. When an exception is encountered in your code, you can choose to have the Debugger displayed at the line causing the exception. The act of causing an exception to occur is called raising an exception.Īll exception are subclasses of the RuntimeException class. These errors will crash your application if you do not handle them in some way. Once you’ve found the source of errors, you want to make sure you handle them properly.Įxceptions are a type of error that occur when something unexpected happens.
#Xojo try not working code#
The debugger can help you verify that your code is working as you expect and it can help you find errors.
0 kommentar(er)
