You sevimli 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!).

SingleOrDefault(IEnumerable, TSource) Returns the only element of a sequence, or a specified default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

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

Objects everywhere), and it makes the construction wordier (birey't use .ToList or collection initializers). And it doesn't really communicate intent either: such a list suggests you could add/remove values, or change them: but that's derece typical usage at all.

Bu örnekte, articles1 ve articles2 dizileri aynı makale mirlıklarına aynı tam ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak bedel olduğunu belirtir.

As I see it IEnumerable is a subset of the interface of ReadOnlyCollection and it does hamiş allow the user to C# ReadOnlyCollectionBase Nerelerde Kullanılıyor modify the collection. So if the IEnumberable interface is enough then that is the one to use. Is that a proper way of reasoning about it or am I missing something?

Bu kod, kuyruğun başındaki elemanı basEleman değkonukenine atar fakat kuyruğun yapısını bileğişçiliktirmez.

ElementAtOrDefault(IEnumerable, Index) Returns the element at a specified index in a sequence or a default value if C# ReadOnlyCollectionBase Nedir the index is out of range.

Exposing the array directly to those using it means that they kişi modify it - this is a violation C# ReadOnlyCollectionBase Kullanımı of encapsulation and data hiding.

Important Some information relates to prerelease product that may be substantially modified before it’s C# ReadOnlyCollectionBase Nasıl Kullanılır released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

However, if you want to access the elements of the C# ReadOnlyCollectionBase Kullanımı IEnumerable collection by index or you want to retrieve the number of elements in the collection, you should use IReadOnlyList birli shown below.

This answer already assumes you want to return IEnumerable without any reasoning to support that decision.

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DefaultIfEmpty(IEnumerable, TSource) Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.