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Use pattern matching (IsNot operator) (IDE0084)

Property Value
Rule ID IDE0084
Title Use pattern matching (IsNot operator)
Category Style
Subcategory Language rules (expression-level preferences)
Applicable languages Visual Basic
Options visual_basic_style_prefer_isnot_expression

Overview

This style rule concerns the use of the Visual Basic 14.0 IsNot pattern, when possible.

Options

Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format.

visual_basic_style_prefer_isnot_expression

Property Value Description
Option name visual_basic_style_prefer_isnot_expression
Option values true Prefer to use the IsNot pattern, when possible
false Prefer not to use the IsNot pattern.
Default option value true
' visual_basic_style_prefer_isnot_expression = true
Dim y = o IsNot C

' visual_basic_style_prefer_isnot_expression = false
Dim y = Not o Is C

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 IDE0084
// The code that's violating the rule is on this line.
#pragma warning restore IDE0084

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0084.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