IDE0170Language rules (pattern matching preferences)

Simplify property pattern

Description

This style rule flags the use of a nested pattern in a property pattern. A nested pattern can be simplified to use an extended property pattern in which property subpatterns are used to reference nested members. Extended property patterns improve code readability.

Example

public record Point(int X, int Y);
public record Segment(Point Start, Point End);

// Violates IDE0170.
static bool IsEndOnXAxis(Segment segment) =>
    segment is { Start: { Y: 0 } } or { End: { Y: 0 } };

// Fixed code.
static bool IsEndOnXAxis(Segment segment) =>
    segment is { Start.Y: 0 } or { End.Y: 0 };

Configurable options

Vote for the value each option should take in the generated .editorconfig.

csharp_style_prefer_extended_property_pattern

default: true

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