CA2257: Members defined on an interface with the 'DynamicInterfaceCastableImplementationAttribute' should be 'static'

Cause

An interface member isn't explicitly implemented or marked static.

Rule description

Since a type that implements IDynamicInterfaceCastable may not implement a dynamic interface in metadata, calls to an instance interface member that is not an explicit implementation defined on this type are likely to fail at run time. To avoid run-time errors, mark new interface members static.

How to fix violations

Mark the interface member static.

Example

[DynamicInterfaceCastableImplementation]
interface IExample
{
    // This method violates the rule.
    void BadMethod();

    // This method satisfies the rule.
    static void GoodMethod()
    {
        // ...
    }
}

When to suppress errors

Do not suppress a warning from this rule.

See also

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