Learn how exception filters help you create reusable exception handling logic.
- [Instructor] It could handle most exceptions…by putting code right inside our controller actions,…but doing it that way in a larger application…would lead to lots of copy-and-pasted code.…It would be better if we could create a reusable piece…of exception-handling logic that then we apply…to the controllers and action methods in our code…without having to copy and paste the actual code itself.…Fortunately, WebAPI provides just such a feature,…and it's called exception filters.…Let's create an exception filter for the situation…we were looking at earlier.…
If SQL server is expecting a certain non-primary key field…to be unique because of a unique constraint that's on…that table, it won't actually throw that exception…until we try and either insert or update a record…that would actually violate that constraint.…In which case, Entity Framework will catch the exception…and bubble it up to us as a DB update exception.…We'll start creating a filter for this situation…by creating a class, and we'll call this…DbUpdate…
AuthorJonathan "J." Tower
- Convention-based routing
- Binding your code to an HTTP request
- Validating models
- Using attributes to route requests
- Customizing attribute routes
- Data serialization and model binding
- Error handling
- Using exception filters and exception loggers
- API documentation and testing
- Securing your API
Skill Level Beginner
1. Controllers and Actions
3. Data Serialization and Model Binding
4. Error Handling
5. API Documentation and Testing
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