IDE0200Language rules (code-block preferences)

Remove unnecessary lambda expression

Description

This rule flags the use of a lambda expression where it's unnecessary. Lambda expressions might be unnecessary when the following are all true:

The expression includes a method invocation.
The lambda expression has the same number and order of parameters as the method invocation.
The method invocation has no side effects.
The lambda expression isn't assigned to a non-delegate type.
If the invocation is a generic method, the type arguments are supplied.
The invoked method's return type can be converted to the lambda expression's return type.
There's only one applicable method in the method group.

Example

// Code with violations.
bool IsEven(int x) => x % 2 == 0;
_ = new[] { 1, 2, 3 }.Where(n => IsEven(n));

// Fixed code.
bool IsEven(int x) => x % 2 == 0;
_ = new[] { 1, 2, 3 }.Where(IsEven);

Configurable options

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

csharp_style_prefer_method_group_conversion

default: true

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