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Use compound assignment (IDE0054 and IDE0074)

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This article describes two related rules, IDE0054 and IDE0074.

Property Value
Rule ID IDE0054
Title Use compound assignment
Category Style
Subcategory Language rules (expression-level preferences)
Applicable languages C# and Visual Basic
Options dotnet_style_prefer_compound_assignment
Property Value
Rule ID IDE0074
Title Use coalesce compound assignment
Category Style
Subcategory Language rules (expression-level preferences)
Applicable languages C# and Visual Basic
Options dotnet_style_prefer_compound_assignment

Overview

These rules concern the use of compound assignment. IDE0074 is reported for coalesce compound assignments and IDE0054 is reported for other compound assignments.

Options

The option value specifies whether or not compound assignments are desired.

For information about configuring options, see Option format.

dotnet_style_prefer_compound_assignment

Property Value Description
Option name dotnet_style_prefer_compound_assignment
Option values true Prefer compound assignment expressions
false Don't prefer compound assignment expressions
Default option value true 
// dotnet_style_prefer_compound_assignment = true
x += 5;

// dotnet_style_prefer_compound_assignment = false
x = x + 5;

' dotnet_style_prefer_compound_assignment = true
x += 5

' dotnet_style_prefer_compound_assignment = false
x = x + 5

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 IDE0054 // Or IDE0074
// The code that's violating the rule is on this line.
#pragma warning restore IDE0054 // Or IDE0074

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0054.severity = none
dotnet_diagnostic.IDE0074.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