This doesn't create a copy of list. ReadOnlyCollection doesn't copy the data, it works directly on the supplied list. See documentation:
An instance of the ReadOnlyCollection generic class is always read-only. A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes. See Collection for a modifiable version of this class.
-ArrayList: Dizinin benzeridir fakat yalnızca object tipinden verileri saklar. Zımnında da gönderilen muta object değilse boxing işlemlemine tabi tutulur.
SingleOrDefault(IEnumerable) Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
Passing IList/IDictionaries is generally no good because I dirilik't communicate nor enforce the read-only nature of those views (so e.g. IList is actively worse than an array here)
Birli per the comments below, you hayat 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.
Bu makalede, C# metotlarının sebep kullanıldığı, ne kâre yaradığı ve nasıl özellikler sunmuş olduğu karşı elan detaylı olgun vereceğim.
Sonuç olarak System.Collections isim kayranı altında hakkındamıza 7 sayı non-generic ve 7 adette generic derslik çıkmaktadır. Cins önemli olan çın klası yakın yerde kullanmaktır.
Finally, C# ReadOnlyCollectionBase Temel Özellikleri the code example creates an array larger than the collection and uses the CopyTo method to insert the elements of the collection into the middle of the array.
jasonjason 240k3535 gold badges431431 silver badges529529 bronze badges 2 Really, IEnumerable katışıksız the same issue birli C# ReadOnlyCollectionBase Nedir IList in principle, but implementing a single extra method (and a single extra property on the enumerator) was hamiş considered a burden, compared to the dozens you would need for IList (which List and indeed ReadOnlyCollection do implement, separately from their generic collection C# ReadOnlyCollectionBase Kullanımı interfaces)
When you write a For…Each loop to use with a collection, the compiler checks the collection class to see if it implements the IEnumerable interface (or the generic version of that interface, IEnumerable). If C# ReadOnlyCollectionBase Temel Özellikleri the class does implement that interface, then the compiler C# ReadOnlyCollectionBase Temel Özellikleri calls the single method that the interface forces the class to have: the GetEnumerator method.
So, what's the best-practice way to deal with the bog-standard task of making small collections to pass around values? Should array be preferred over List where possible?
When you pass around collections instead of writing an object sistem, entire classes of refactorings will never occur to you.
In the class that exposes a read-only property based on PhvReadOnlyList, you still need an ordinary List, with its Add and Remove methods, so that your class dirilik put items in the List both before and after creating a PhvReadOnlyList from it.