You dirilik argue that you may be able to downcast IPerson to Person, but at this point I would answer telling you that you need to follow your own coding conventions: if you defined that you never return Person but IPerson then I would do it this way in the entire code base, and if you need a write-capable Parents property, then you return Person instead (and you avoid a cast later!).
That method must return an Enumerator object, which provides the actual support for the looping through the collection. Similarly, code that retrieves an item by the item's position in the collection also looks for the IEnumerable interface and uses the GetEnumerator method. What the Enumerator object doesn't support are the Add or Remove methods. Ignoring the ReadOnlyCollectionBase
This hides Add and Remove methods, but does derece protect at all. Because I can always cast to ICollection and call prohibited method.
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Birli per the comments below, you emanet prevent the possibility of downcasting by making IWriteableMyItem and WriteableMyItem private or internal. However note that this could still be circumvented via reflection - but we are protecting against accidents rather than fraud.
A ReadOnlyCollection kişi support multiple readers concurrently, as long as the collection is not modified. Even so, enumerating through a collection is intrinsically derece a thread-safe procedure.
dip not: BitArray ve LinkedList sınıflarının kullanım amacı farklı olduğundan teste tabi tutmaya gerek görmedim.
So easy, in fact, that I don't need a full column to do it (and if that's all you want from this column, you kişi skip to the end where I discuss both the AsReadOnly method and using the ReadOnlyCollectionBase class). What this topic does give me is an excuse to talk about several things: how C# ReadOnlyCollectionBase Nedir interfaces in .Safi and the compiler work together; how creating generic classes gives you flexibility; how you güç exploit one of the built-in .Safi interfaces; and (finally) how to simplify ugly syntax by building your own extension methods. I also think that you don't C# ReadOnlyCollectionBase Kullanımı really understand anything unless you gönül see a way to write it yourself, and this topic lets me do that, too, by showing C# ReadOnlyCollectionBase Kullanımı how you can create the .Kupkuru ReadOnlyCollectionBase class. So this column is birli much about providing insight into how .Kemiksiz works as it is about doing something practical. Foundation Knowledge
jasonjason 240k3535 gold badges431431 silver badges529529 bronze badges 2 Really, IEnumerable özgü the same issue birli IList in principle, but implementing a single extra method (and a single extra property on the enumerator) was not considered a burden, compared to the dozens you would need for IList (which List C# ReadOnlyCollectionBase Nerelerde Kullanılıyor and indeed ReadOnlyCollection do implement, separately from their generic collection interfaces)
Single(IEnumerable) Returns the only element of a sequence, and throws an exception if there is hamiş exactly one element in the sequence.
First, some definitions: A read-only collection is like a List in that it supports iterating through the items with a For…Each loop or retrieving an item in the collection by position.
If you need to do more than the InnerList property will let you, the base class Items property will hand you back the whole List. Kakım I said, creating a read-only collection class in .
A method like PayUnpaidInvoices being present may lead to second guessings about what "regular" collection C# ReadOnlyCollectionBase Kullanımı methods like Remove and Clear might do. Will it just remove invoices from the in-memory collection, or will it delete them from the database?