A type implements the equality or inequality operator and does not implement the opposite operator.
By default, this rule only looks at externally visible types, but this is configurable.
Rule descriptionThere are no circumstances where either equality or inequality is applicable to instances of a type, and the opposite operator is undefined. Types typically implement the inequality operator by returning the negated value of the equality operator.
The C# compiler issues an error for violations of this rule.
How to fix violationsTo fix a violation of this rule, implement both the equality and inequality operators, or remove the one that's present.
When to suppress warningsDo not suppress a warning from this rule. If you do, your type will not work in a manner that's consistent with .NET.
Configure code to analyzeUse the following option to configure which parts of your codebase to run this rule on.
You can configure this option for just this rule, for all rules it applies to, or for all rules in this category (Usage) that it applies to. For more information, see Code quality rule configuration options.
Include specific API surfacesYou can configure which parts of your codebase to run this rule on, based on their accessibility, by setting the api_surface option. For example, to specify that the rule should run only against the non-public API surface, add the following key-value pair to an .editorconfig file in your project:
dotnet_code_quality.CAXXXX.api_surface = private, internal
Note
Replace the XXXX part of CAXXXX with the ID of the applicable rule.
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