IDE0072Language rules (expression-level preferences)

Add missing cases to switch expression

Description

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.

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,
        };
    }
}

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