wcf

WCF in .Net framework had an overload for ServiceKnownType as follows:

[ServiceKnownType("GetKnownTypes", typeof(DataProviderTypes))]
public interface IService
{
}

public class DataProviderTypes
{
    public static IEnumerable<Type> GetKnownTypes(ICustomAttributeProvider provider)
    {
        List<Type> lst = new List<Type>();
        '
        '
        return lst;
    }

generated code will throw hundreds of warnings

warning CS0618: 'AssociationAttribute' is obsolete: 'This attribute is no longer in use and will be ignored if applied.'