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Add missing cases to switch expression (IDE0072)

  • Article
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