C# ReadOnlyCollectionBase Kullanımı Üzerinde Buzz söylenti

C# ReadOnlyCollectionBase Kullanımı Üzerinde Buzz söylenti

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I'm going to start by being perverse and pretending that the ReadOnlyCollectionBase class doesn't exist. If that were true and you wanted to create a read-only collection, you'd create a class that only returned an Enumerator object. A class that just implements IEnumerable is, according to my definitions, a read-only collection class. Generating that GetEnumerator object from your class isn't difficult if you keep your class data in a class that itself implements IEnumerable -- a List, for instance. If you do keep your data in a List, then you kişi use the List GetEnumerator method to retrieve an Enumerator object, which you gönül then return to the yetişek using your class. Listing 1 has the basics of this class (I've called it PhvReadOnlyList).

Define your own class which implements IEnumerator, takes an IList in the new constructor, katışıksız a read only default item property taking an index, and does derece include any properties/methods that could otherwise allow your list to me manipulated.

DescendantNodes(IEnumerable) Returns a collection of the descendant nodes of every document and element in the source collection.

Kakım the last point states, you shouldn't avoid ReadOnlyCollection like you were suggesting. It is a very useful type to use for public members to inform the consumer of C# ReadOnlyCollectionBase Nasıl Kullanılır the limitations of the collection they are accessing.

Summary. The ReadOnlyCollection functions birli a wrapper for any collection that implements IList. It adds a level of indirection that reduces possible changes.

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Thous leads that your consumer classes are C# ReadOnlyCollectionBase Nedir just awaiting interfaces instead of concrete classes and so you yaşama change the concrete implementation at a later stage without breaking your public contract (due to performance reasons use an List instead of a LinkedList or vice versa).

Average(IEnumerable, Func) Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are hamiş guaranteed to be thread safe.

Başarım Optimizasyonu: IList, bilgi erişimini optimize ederek uygulamanın performansını fazlalıkrabilir ve bellek yönetimini iyileştirebilir.

Single(IEnumerable) Returns the only element of a sequence, and throws an exception if there is derece exactly one element in the sequence.

However, a read-only C# ReadOnlyCollectionBase Nasıl Kullanılır 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).

Does this double well potential contradict the fact that C# ReadOnlyCollectionBase Nasıl Kullanılır there is no degeneracy for one-dimensional bound states?

One should note that aku's answer will only protect the list birli being read only. Elements in the list C# ReadOnlyCollectionBase Nedir are still very writable.