IDE0051Unnecessary code rules (expression-level preferences)

Remove unused private member

Description

This rule flags unused private methods, fields, properties, and events that have no read or write references.

Example

// Code with violations
class C
{
    // IDE0051: Remove unused private members
    private readonly int _fieldPrivate;
    private int PropertyPrivate => 1;
    private int GetNumPrivate() => 1;

    // No IDE0051
    internal readonly int FieldInternal;
    private readonly int _fieldPrivateUsed;
    public int PropertyPublic => _fieldPrivateUsed;
    private int GetNumPrivateUsed() => 1;
    internal int GetNumInternal() => GetNumPrivateUsed();
    public int GetNumPublic() => GetNumPrivateUsed();
}

// Fixed code
class C
{
    // No IDE0051
    internal readonly int FieldInternal;
    private readonly int _fieldPrivateUsed;
    public int PropertyPublic => _fieldPrivateUsed;
    private int GetNumPrivateUsed() => 1;
    internal int GetNumInternal() => GetNumPrivateUsed();
    public int GetNumPublic() => GetNumPrivateUsed();
}

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