Use implicitly typed lambda (IDE0350)

Property	Value
Rule ID	IDE0350
Title	Use implicitly typed lambda
Category	Style
Subcategory	Language rules (expression-level preferences)
Applicable languages	C# 14+
Options	`csharp_style_prefer_implicitly_typed_lambda_expression`

Overview

This rule flags places where an explicitly typed lambda expression can be converted to an implicitly typed lambda expression.

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

Property	Value	Description
Option name	csharp_style_prefer_implicitly_typed_lambda_expression
Option values	`true`	Prefer to use an implicitly typed lambda
	`false`	Disables the rule
Default option value	`true`

// Code with violations.
Action<int> a = (int x) => { };
Delegate b = (Action<int>)( (int x) => { } );

// Fixed code.
Action<int> a = x => { };
Delegate b = (Action<int>)( x => { } );

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 IDE0350
// The code that's violating the rule is on this line.
#pragma warning restore IDE0350

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0350.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