Unused private member (IDE0051)

Key dotnet.codequality.unused-private-member · Severity warning · Category codequality

Microsoft code-style analyzer IDE0051. Flags a private method, property or field nothing in the type uses. It is dead code - or a sign that the code meant to call it does not.

Incorrect

public class Pricing
{
    public decimal Total(Order o) => o.Lines.Sum(l => l.Amount);

    private decimal Discount(Order o) => o.Total * 0.1m; // never called
}

Correct

public class Pricing
{
    public decimal Total(Order o) => o.Lines.Sum(l => l.Amount);
}