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Use expression body for local functions (IDE0061)

  • Article
Property Value
Rule ID IDE0061
Title Use expression body for local functions
Category Style
Subcategory Language rules (expression-bodied members)
Applicable languages C#
Options csharp_style_expression_bodied_local_functions

Overview

This style rule concerns the use of expression bodies versus block bodies for local functions. Local functions are private methods of a type that are nested in another member.

Options

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

csharp_style_expression_bodied_local_functions

Property Value Description
Option name csharp_style_expression_bodied_local_functions
Option values true Prefer expression bodies for local functions
when_on_single_line Prefer expression bodies for local functions when they'll be a single line
false Prefer block bodies for local functions
Default option value false 
// csharp_style_expression_bodied_local_functions = true
void M()
{
    Hello();
    void Hello() => Console.WriteLine("Hello");
}

// csharp_style_expression_bodied_local_functions = false
void M()
{
    Hello();
    void Hello()
    {
        Console.WriteLine("Hello");
    }
}

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 IDE0061
// The code that's violating the rule is on this line.
#pragma warning restore IDE0061

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0061.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

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

See also