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CA1823: Avoid unused private fields

  • Article
Property Value
Rule ID CA1823
Title Avoid unused private fields
Category Performance
Fix is breaking or non-breaking Non-breaking
Enabled by default in .NET 9 No

Cause

This rule is reported when a private field exists in your code but is not used by any code path.

Rule description

Private fields were detected that do not appear to be accessed in the assembly.

How to fix violations

To fix a violation of this rule, remove the field or add code that uses it.

When to suppress warnings

It is safe to suppress a warning from this rule.

Suppress a warning

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA1823
// The code that's violating the rule is on this line.
#pragma warning restore CA1823

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA1823.severity = none

For more information, see How to suppress code analysis warnings.