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

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

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