CA2256: All members declared in parent interfaces must have an implementation in a DynamicInterfaceCastableImplementation-attributed interface

Property	Value
Rule ID	CA2256
Title	All members declared in parent interfaces must have an implementation in a DynamicInterfaceCastableImplementation-attributed interface
Category	Usage
Fix is breaking or non-breaking	Non-breaking
Enabled by default in .NET 8	As warning

Cause

An interface with DynamicInterfaceCastableImplementationAttribute has a non-implemented member.

Rule description

Types attributed with DynamicInterfaceCastableImplementationAttribute act as an interface implementation for a type that implements the IDynamicInterfaceCastable type. As a result, it must provide an implementation of all of the members defined in the inherited interfaces, because the type that implements IDynamicInterfaceCastable will not provide them otherwise.

How to fix violations

Implement the missing interface members.

When to suppress errors

Do not suppress a warning from this rule.

See also

• Usage warnings