Do not declare protected members in sealed types
Do not declare protected members in sealed types
Microsoft docsDescription
Types declare protected members so that inheriting types can access or override the member. By definition, you cannot inherit from a sealed type, which means that protected methods on sealed types cannot be called.
The C# compiler emits warning CS0628 instead of CA1047 for this situation.
Cause
A public type is sealed (NotInheritable in Visual basic) and declares a protected member or a protected nested type. This rule does not report violations for System.Object.Finalize methods, which must follow this pattern.
How to fix violations
To fix a violation of this rule, change the access level of the member to private, or make the type inheritable.
Example
public sealed class SealedClass
{
protected void ProtectedMethod(){}
}When to suppress
Do not suppress a warning from this rule. Leaving the type in its current state can cause maintenance issues and does not provide any benefits.