When creating big applications(even medium apps) there are so many different kinds of exceptions that can come?
How to go about handling them?
Ideally by the following
1. Anticipate expected conditions that can result in errors. These of course vary by the area of the application/enterprise in which they appear.
2. Consider what the application/enterprise should do when those occur. This includes how or even if it should be logged.
3. Implement the code based on 1/2
4. Unit test the code of 3, including the exception generation
5. Besides the above boundary layers should ALWAYS assume that unexpected errors will occur. Those exceptions should be caught and logged once (not every layer.) Each layer must determine what the result is when an unexpected exception occurs and what the layer (or specific parts of the layer) do when an unexpected exception occurs.
As an example...
A database layer should always expect that communication errors will occur. There are various ways of dealing with this (which do not matter for this discussion) but they should still be expected. Even a clustered database solution can experience communication failure. Whether this is logged depends on how it is handled but even if the database layer is returning it as a result failure is should not log a stack trace, but just log it as a single error (db comm error.)
A database layer should not normally expect a SQL syntax error. That is something that should normally only occur during development or QA. So if it occurs one must log it. The database layer can handle this as a failed result.
I have this small feeling that we have more control on our application when we manually code it instead of using a code generator. Is it true?
If so then how often should we use a code generator and to what extent?
If not so then can someone guide me to a good place where I can learn about writing code generators?!
And what one would do when decide to open designer of such a form? I would guess that they wouold come to you to punch you
I very often edit them but not remove them, so i guess I am not withbout sin. :p
They're not really generated code, they're code which is manually edited using a graphical IDE. That is, every line in a .designer.cs file is there because you set a property or clicked something in the graphical editor.