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Use expression body for operators (IDE0023 and IDE0024)

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This article describes two related rules, IDE0023 and IDE0024, which apply to conversion operators and operators, respectively.

Property Value
Rule ID IDE0023
Title Use expression body for conversion operators
Category Style
Subcategory Language rules (expression-bodied members)
Applicable languages C#
Options csharp_style_expression_bodied_operators
Property Value
Rule ID IDE0024
Title Use expression body for operators
Category Style
Subcategory Language rules (expression-bodied members)
Applicable languages C#
Options csharp_style_expression_bodied_operators

Overview

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

Options

Set the value of the associated option for these rules to specify whether expression bodies or block bodies for operators are preferred, and if expression bodies are preferred, whether they're preferred only for single-line expressions.

For more information about configuring options, see Option format.

csharp_style_expression_bodied_operators

Property Value Description
Option name csharp_style_expression_bodied_operators
Option values true Prefer expression bodies for operators
when_on_single_line Prefer expression bodies for operators when they will be a single line
false Prefer block bodies for operators
Default option value false 
// csharp_style_expression_bodied_operators = true
public static ComplexNumber operator + (ComplexNumber c1, ComplexNumber c2)
    => new ComplexNumber(c1.Real + c2.Real, c1.Imaginary + c2.Imaginary);

// csharp_style_expression_bodied_operators = false
public static ComplexNumber operator + (ComplexNumber c1, ComplexNumber c2)
{ return new ComplexNumber(c1.Real + c2.Real, c1.Imaginary + c2.Imaginary); }

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 IDE0023 // Or IDE0024
// The code that's violating the rule is on this line.
#pragma warning restore IDE0023 // Or IDE0024

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0023.severity = none
dotnet_diagnostic.IDE0024.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