All rules
IDE0083Language rules (pattern matching preferences)
Use pattern matching (not operator)
Use pattern matching (not operator)
Microsoft docsDescription
This style rule concerns the use of C# 9.0 not pattern, when possible.
Example
// csharp_style_prefer_not_pattern = true
var y = o is not C c;
// csharp_style_prefer_not_pattern = false
var y = !(o is C c);Configurable options
Vote for the value each option should take in the generated .editorconfig.
csharp_style_prefer_not_pattern default:
trueYour vote
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