Chapter 9
Debugging and Error Handling
What you will learn in this chapter:
- How to interpret errors so that you can get them fixed
- How to manage errors and shield your users from their details
- How to use the ObjectInfo helper to analyze and debug code
- How to use the ServerInfo helper to obtain data about your environment
- Using .NET Tracing to obtain data about the execution of your pages
By now, you have already written a fair amount of code as you worked your way through the exercises presented to you so far. If you are anything like me, and 99% of all developers, you will have made typographical mistakes and caused error pages to appear when you tried to execute your code. That is to be expected. Bugs and errors will happen, and they happen at a very high frequency when you are just learning how to program.
Before you can fix errors, you need to understand how they occurred. This chapter provides you with sufficient information to be able to understand how errors happen, prevent them from disrupting your users, and fix them quickly.
Anatomy of an Error
Before you can defeat errors, you need to know your enemy. There are broadly two kinds of errors: those that occur when the pages compile, and those that happen at execution time, or run time. Compilation errors nearly always result from syntax errors caused by missing semicolons, missing braces, or other typing errors. Some of these errors are reported by the compiler, whereas others are reported by the Razor parser. These ...
