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title description ms.date f1_keywords helpviewer_keywords author ms.author dev_langs
IDE0072: Add missing cases to switch expression
Learn about code analysis rule IDE0072: Add missing cases to switch expression
09/30/2020
IDE0072
IDE0072
gewarren
gewarren
CSharp

Add missing cases to switch expression (IDE0072)

Property Value
Rule ID IDE0072
Title Add missing cases to switch expression
Category Style
Subcategory Language rules (expression-level preferences)
Applicable languages C# 8.0+

Overview

This rule concerns specifying all the missing cases for a switch expression. A switch expression is considered incomplete with missing cases in following scenarios:

  • When an enum switch expression is missing cases for one or more enum members.
  • When the fall-through case _ is missing.

Options

This rule has no associated code-style options.

Example

enum E
{
    A,
    B
}

class C
{
    // Code with violations
    int M(E e)
    {
        // IDE0072: Add missing cases
        return e switch
        {
            E.A => 0,
            _ => -1,
        };
    }

    // Fixed code
    int M(E e)
    {
        return e switch
        {
            E.A => 0,
            E.B => 1,
            _ => -1,
        };
    }
}

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 IDE0072
// The code that's violating the rule is on this line.
#pragma warning restore IDE0072

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

[*.{cs,vb}]
dotnet_diagnostic.IDE0072.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