Make anonymous function static (IDE0320)

Property	Value
Rule ID	IDE0320
Title	Make anonymous function static
Category	Style
Subcategory	Language rules (modifier preferences)
Applicable languages	C#
Options	`csharp_prefer_static_anonymous_function`

Overview

This style rule flags anonymous functions that can be marked static.

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_prefer_static_anonymous_function
Option values	`true`	Prefer anonymous functions to be marked `static`
	`false`	Disables the rule
Default option value	`true`

// Code with violations.
M(x => x + 1);
M(delegate (int x) { return x + 1; });

void M(Func<int, int> f) { }

// Fixed code.
M(static x => x + 1);
M(static delegate (int x) { return x + 1; });

void M(Func<int, int> f) { }

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 IDE0320
// The code that's violating the rule is on this line.
#pragma warning restore IDE0320

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0320.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