AA2000 - Do Not Use Not Implemented Exception
Report code: AA2000-DoNotUseNotImplementedException
Summary
| Status | Implemented |
| Description | The NotImplementedException is a direct violation of the Liskov Substitution Principle (LSP) and so must not be used |
| Category | Liskov Substitution Principle Analyzers |
| Enabled by default: | Yes |
| Severity: | Error |
Cause
From the Liskov Substitution Principle (LSP) article on Wikipedia: > Substitutability is a principle in object-oriented programming. It states that, in a computer program, if S is a subtype of T, then objects of type T may be replaced with objects of type S (i.e., objects of type S may substitute objects of type T) without altering any of the desirable properties of that program (correctness, task performed, etc.)
A subtype (or interface implementation) that throws a NotImplementedException cannot be used as a substitute to its parent “without altering any of the desirable properties of that program”. Therefore the use of this exception is a violation of the LSP.
How to fix violations
There currently aren’t any implemented code-fixes for this rule.
How to suppress violations
This rule cannot be suppressed.