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Nullable directive is unnecessary (IDE0241)

  • บทความ
Property Value
Rule ID IDE0241
Title Nullable directive is unnecessary
Category Style
Subcategory Unnecessary code rules (expression-level preferences)
Applicable languages C#

Overview

This rule flags places where a #nullable directive is unnecessary. The directive is unnecessary where there are no reference types that would be impacted by the nullable context scope change. For example:

  • #nullable enable in a project where nullable context is already enabled.
  • #nullable disable in a project where nullable context is already disabled.
  • #nullable disable for an enumeration.
  • #nullable disable or #nullable restore at the end of a file that includes #nullable enable in a project where nullable context is disabled.

Options

This rule has no associated code-style options.

Example

// Code with violations (in a project with <Nullable>enable</Nullable>).
#nullable disable
enum Place
{
    First,
    Second
}

// Fixed code.
enum Place
{
    First,
    Second
}

Suppress a warning

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

#pragma warning disable IDE0241
// The code that's violating the rule is on this line.
#pragma warning restore IDE0241

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0241.severity = none

To disable all of the code-style rules, set the severity for the category Style to none in the configuration file.

[*.{cs,vb}]
dotnet_analyzer_diagnostic.category-Style.severity = none

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

See also