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Struct can be made 'readonly' (IDE0250)

Property Value
Rule ID IDE0250
Title Struct can be made 'readonly'
Category Style
Subcategory Language rules (modifier preferences)
Applicable languages C#
Options csharp_style_prefer_readonly_struct

Overview

This rule flags structs that aren't marked readonly when all their members are marked 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

Property Value Description
Option name csharp_style_prefer_readonly_struct
Option values true Prefer to make a struct readonly when all its fields are readonly.
false Disables the rule.
Default option value true

Example

// Code with violations.
struct S
{
    readonly int i;
}

// Fixed code.
readonly struct S
{
    readonly int i;
}

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 IDE0250
// The code that's violating the rule is on this line.
#pragma warning restore IDE0250

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0250.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.