Make anonymous function static (IDE0320)

Overview

This style rule flags anonymous functions that can be marked static. Marking them as static prevents local variables from being captured, which would result in a memory allocation.

Options

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

csharp_prefer_static_anonymous_function

Example

// 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) { }

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 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

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

See also

• Static anonymous functions