public static IContract Add(this IContract lhs, IContract rhs)
{
if (lhs == null)
{
return(rhs);
}
if (rhs == null)
{
return(lhs);
}
var lhsItems = CompositeExtensions.SelectMany(lhs);
var rhsItems = CompositeExtensions.SelectMany(rhs);
var contract = new CompositeContract(lhsItems.Concat(rhsItems));
return(contract);
}
public static T Find <T>(this IContract contract)
where T : IContract
{
return(CompositeExtensions.SelectMany(contract).OfType <T>().FirstOrDefault());
}