Abstract class constructor (ARCH710)

Key dotnet.codequality.abstract-class-constructor · Severity warning · Category codequality

Abstract classes cannot be instantiated directly, so exposing a public or internal constructor is misleading. The constructor should be protected for derived types only.

Incorrect

public abstract class Shape
{
    public Shape(string name) => Name = name;
    public string Name { get; }
}

Correct

public abstract class Shape
{
    protected Shape(string name) => Name = name;
    public string Name { get; }
}

Fix

Mark abstract class constructors as protected (or private protected).