Use expression body for lambdas (IDE0053)

Property Value
Rule ID IDE0053
Title Use expression body for lambdas
Category Style
Subcategory Language rules (expression-bodied members)
Applicable languages C#
Options csharp_style_expression_bodied_lambdas


This style rule concerns the use of expression bodies versus block bodies for lambda expressions.


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_expression_bodied_lambdas
Option values true Prefer expression bodies for lambdas
when_on_single_line Prefer expression bodies for lambdas when they'll be a single line
false Prefer block bodies for lambdas
Default option value true
// csharp_style_expression_bodied_lambdas = true
Func<int, int> square = x => x * x;

// csharp_style_expression_bodied_lambdas = false
Func<int, int> square = x => { return x * x; };

Suppress a warning

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 IDE0053
// The code that's violating the rule is on this line.
#pragma warning restore IDE0053

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

dotnet_diagnostic.IDE0053.severity = none

To disable all of the code-style rules, set the severity for the category Style to none in the configuration file.

dotnet_analyzer_diagnostic.category-Style.severity = none

For more information, see How to suppress code analysis warnings.

See also