Code inspection: Unassigned readonly field

This inspection reports readonly fields that are never assigned. A readonly field must be initialized either where it is declared or in a constructor. If it is left unassigned, it will keep its default value, which is often not what the code intends.

Example

                class C
                {
                    private readonly int value;
                }
            

                class C
                {
                    private readonly int value;
                    public C(int value)
                    {
                        this.value = value;
                    }
                }
            

Quick-fix

Initialize the readonly field in the constructor or at the declaration site.

01 April 2026