Make local function static (IDE0062)

Property	Value
Rule ID	IDE0062
Title	Make local function static
Category	Style
Subcategory	Language rules (modifier preferences)
Applicable languages	C# 8.0+
Options	csharp_prefer_static_local_function

Overview

This style rule flags local 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_local_function

Property	Value	Description
Option name	csharp_prefer_static_local_function
Option values	true	Prefer local functions to be marked static
	false	Prefer local functions not to be marked static
Default option value	true:suggestion

// csharp_prefer_static_local_function = true
void M()
{
    Hello();
    static void Hello()
    {
        Console.WriteLine("Hello");
    }
}

// csharp_prefer_static_local_function = 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 IDE0062
// The code that's violating the rule is on this line.
#pragma warning restore IDE0062

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0062.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

• Code style language rules
• Code style rules reference