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Simply put, Microsoft defined a ReadOnlyCollectionBase, yet did not use it bey the base class for ReadOnlyCollection when it clearly sounds that this should have been the way.
. Why not return IEnumerable? Calling code would have to cast, which they are unlikely to do without knowing the internals of the property they are accessing.
List's are a very common datastructure, but creating them in this fashion involves quite a bit of syntactic noise - and it can easily get even worse (e.g.
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.
Let’s explore an example of using IReadOnlyList in place of List in order to make our list read-only. Consider the following class:
Ancestors(IEnumerable) Returns a collection of elements that contains the ancestors of every node in the source collection.
HashTable hash kodlarına bakarak dizdiğinden makul bir sıralaması yoktur.Algoritması bu kodların süresince gizlidr. Dictionary ise verilerin ekleniş sırasını hiç değanlayıştirmeden saklamıştır.
Dan TaoDan Tao 128k5656 gold badges308308 silver badges448448 bronze badges 4 I'd like to avoid noise in C# ReadOnlyCollectionBase Nerelerde Kullanılıyor both callee and caller. Exposing a ReadOnlyCollection birli anything other than itself isn't necessary: after all, exposing it bey an IList just gets confusing (where'd I get this IList from - sevimli I modify it?), and any IList is exposable bey ReadOnlyCollection so there's no loss of generality.
If you do this then there's nothing stopping your callers casting the IEnumerable back to ICollection and then modifying it. ReadOnlyCollection removes this possibility, although it's still possible to access the underlying writable collection via reflection.
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 the class does implement that interface, then the compiler calls the single method that the interface forces the class C# ReadOnlyCollectionBase Temel Özellikleri to have: the GetEnumerator method.
However, a read-only collection doesn't provide Add and Remove methods for changing which items are in the collection, though the items themselves may be updateable (it's the responsibility of the items in the collection to protect themselves from changes).
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SkipWhile(IEnumerable, Func) Bypasses elements in a sequence C# ReadOnlyCollectionBase Nerelerde Kullanılıyor bey long as a specified condition is true and then returns the remaining elements. The element's index C# ReadOnlyCollectionBase Kullanımı is used in the logic of the predicate function.