public static IEnumerable SelectNullable <T>(this NullAllowed <T> nullable,
Func <T, IEnumerable> selector)
where T : class
{
Contract.Requires(selector != null);
return(nullable.Select(selector).AllowNull());
}
public static ICollection <TResult> SelectNullable <T, TResult>(this NullAllowed <T> nullable,
Func <T, ICollection <TResult> > selector)
where T : class
{
Contract.Requires(selector != null);
return(nullable.Select(selector).AllowNull());
}