SDT0404: Read Only Input Mapping

Property	Value
Rule ID	SDT0404
Title	Read Only Input Mapping
Category	Input
Severity	Error

Cause

A field or property is decorated with [ActionInput] or [RangeInput], but it is declared readonly or, in the case of properties, does not have a set method.

Rule Description

When a field or property is decorated with an action- or range input attribute, it must be mutable.

How to Fix Violations

Ensure every field and property must be mutable, meaning, is not a literal expression nor a readonly member.

Violation:

public sealed class PlayerInputState : IInputReceiver 
{
    [ActionInput(PlayerActions.Crouch)]
    public readonly bool IsCrouching = false; // Non-mutable type!

    [RangeInput(PlayerActions.WalkForward)]
    public float WalkForward { get; } = 0.0F; // No setter!
}

Fix:

public sealed class PlayerInputState : IInputReceiver 
{
    [ActionInput(PlayerActions.Crouch)]
    public bool IsCrouching = false;

    [RangeInput(PlayerActions.WalkForward)]
    public float WalkForward { get; set; } = 0.0F;
}

When to Suppress Warnings