To guarantee thread safety during enumeration, you güç either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.
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.
I avoid using ReadOnlyCollection birli much as possible, it is actually considerably slower than just using a uygun List.
Sum(IEnumerable, Func) Computes the sum of the sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.
Summary. The ReadOnlyCollection functions kakım a wrapper for any collection that implements IList. It adds a level of indirection that reduces possible changes.
Your implementation depends on your needs: - If you don't care about the caller (Class B) from seeing any further changes to the collection then you hayat just clone the collection, hand it out, and stop caring. - If you definitely need the caller (Class B) to see changes that are made to the collection, and you want this to be thread-safe, then you have more of a problem on your hands.
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; but this question convinced me to go ahead and announce an open source project I've had in the works for a while (still a work in progress, but there's some useful stuff in there), which includes an IArray interface (and implementations, naturally) that I think captures exactly what you want here: an indexed, read-only, even covariant
C# Queue klası kullanımı enikonu basittir ve çeşitli adımları bâtınerir. Bu adımları güzel bir şekilde uyma ederek, Queue sınıfını C# ReadOnlyCollectionBase Nerelerde Kullanılıyor bitek bir şekilde kullanabilirsiniz. İşte temel adımlar ve detayları:
IDictionary tabanlı nesnelerin nasıl sıralama yaptığı ile müteallik şu kodu yazarak bir sınav yaparsak:
Single(IEnumerable) Returns the only element of a sequence, and throws an exception if there is hamiş exactly one element in the sequence.
SingleOrDefault(IEnumerable, Func) Returns the only element of a sequence C# ReadOnlyCollectionBase Kullanımı that satisfies a specified condition or a default value if no such element exists; this method C# ReadOnlyCollectionBase Kullanımı throws an exception if more than one element satisfies the condition.
-HashTable ve Sorted List: Bu iki klasın çkızılışma prensipleri C# ReadOnlyCollectionBase Temel Özellikleri birbirine çok yakındır. Bir bölgede dü tane veri çitndırırlar. Bunlar ‘Key’ ve ‘Value’dur. Verdiğimiz ‘Key’ değeri unique sürdürmek ve null olmamak zorundadır. HashTable ve SortedList, verilere ulaşırken çitndırdıkları unique anahtarları kullanarak ulaşırlar. Sonunda aldıkları C# ReadOnlyCollectionBase Temel Özellikleri verilere bir nevi Identity kolonuna bağlamış olurlar. Key değerleri atandıktan sonra asla değdavranışmez.
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