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Remove unnecessary suppression operator (IDE0080)

  • Članak
Property Value
Rule ID IDE0080
Title Remove unnecessary suppression operator
Category Style
Subcategory Unnecessary code rules (expression-level preferences)
Applicable languages C#

Overview

This rule flags an unnecessary suppression or null-forgiving operator. The operator is unnecessary when it's used in a context where it has no effect. Use of the suppression operator, for example, x!, declares that the expression x of a reference type isn't null. However, when used in a context of another operator, for example, the is operator in o !is string, it has no effect and can be removed.

Options

This rule has no associated code-style options.

Example

C# 
// Code with violations
if (o !is string) { }

// Potential fixes:
// 1.
if (o is not string) { }

// 2.
if (!(o is string)) { }

// 3.
if (o is string) { }

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.

C# 
#pragma warning disable IDE0080
// The code that's violating the rule is on this line.
#pragma warning restore IDE0080

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

ini 
[*.{cs,vb}]
dotnet_diagnostic.IDE0080.severity = none

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

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

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

See also