Exception Handling Example: how to handle different levels of error for internal components, plugins, WCF service

The project contains:

1. App - WPF Application

• Settings dialog - works with business logic of the App.
• Book list with add new book dialog = works with WCF Service as a source (see below).
• Buttons which invoke methods of Internal Component and plugins (see below).
• Two independent log lists which filter log entries by severity.

2. Internal Component which App is referenced directly:

• Component has methods which work correct or throws exceptions of different severity.

3. Plugins which App is loaded dynamically:

• Each plugin throws an exception of different severity.

4. WCF Service which App uses as remote source:

• Service has methods which work correct or throw exceptions of different severity.
• Exceptions are wrapped by FaultException and passed over network connection.