public void SelectMany_Helper()
{
IFoo castedFoo = (IFoo)foo;
IEnumerable <IFoo> items = CompositeExtensions.SelectMany(castedFoo);
Assert.Equal(5, items.Count());
Assert.Equal(2, items.OfType <Foo>().Count());
Assert.Equal(3, items.OfType <OtherFoo>().Count());
}
public IContract Add(IContract lhs, IContract rhs)
{
if (lhs == null)
{
return(rhs);
}
if (rhs == null)
{
return(lhs);
}
IEnumerable <IContract> lhsItems = CompositeExtensions.SelectMany(lhs);
IEnumerable <IContract> rhsItems = CompositeExtensions.SelectMany(rhs);
CompositeContract contract = new CompositeContract(lhsItems.Concat(rhsItems));
return(contract);
}
public virtual T Find <T>(IContract contract)
where T : IContract
{
return(CompositeExtensions.SelectMany(contract).OfType <T>().FirstOrDefault());
}