Member can be made 'readonly' (IDE0251)

Overview

This rule flags members of non-readonly structs that aren't marked readonly that could be marked as readonly.

Options

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

csharp_style_prefer_readonly_struct_member

Example

// Code with violations.
struct S
{
    void M() { }
}

// Fixed code.
struct S
{
    readonly void M() { }
}

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 IDE0251
// The code that's violating the rule is on this line.
#pragma warning restore IDE0251

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0251.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.