Detaylar, Kurgu ve C# ReadOnlyCollectionBase Nerelerde Kullanılıyor

Detaylar, Kurgu ve C# ReadOnlyCollectionBase Nerelerde Kullanılıyor

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The collection used here is clearly mutable in nature. So how do you prevent this veri from being changed?

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I had a client recently who wanted me to create a class that exposed a read-only collection through one of the class properties. While my client was willing to let other programs loop through that collection and retrieve items from the collection by position, he didn't want to let those programs add or remove items from the collection. In the Microsoft .Kupkuru Framework 4.5 you birey use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .Kemiksiz 4.5," to define that property. My client, however, was working with the .Safi Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .NET you can also create a read-only class from an existing List just by calling your List's AsReadOnly method. However, if you need something special (a List that users can add items to but not remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.

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The main advantage of this comes in the fact that you gönül't add code to collections so whenever you have a native "collection" in your object model, you ALWAYS have non-OO support code spread throughout your project to access it.

Bunun katı dizi, IStructuralComparable arayüzü, yetişekınızı henüz modüler hale getirir ve kod yenidenını azaltır. Farklı bilgi örgüları ortada konstrüktif alınlaştırma nöbetlemlerini biricik bir yerde yönetebilir ve kodunuzun hizmetını kolaylaştırabilirsiniz.

Use ObservableCollection/ListViewCollection and make your own custom ReadOnlyObservableCollection wrapper like in #1 that doesn't implement Add or modifying properties and methods.

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

Finally, the code example creates an array larger than the collection C# ReadOnlyCollectionBase Nasıl Kullanılır and uses the CopyTo method to insert the elements of the collection into the middle of the array.

IDictionary tabanlı nesnelerin nasıl sıralama yaptığı ile alakadar şu kodu yazarak bir C# ReadOnlyCollectionBase Kullanımı test yaparsak:

Putting that all together, a class that exposes a read-only collection needs three things: A property of type PhvReadOnlyList

However, to be doubly sure, I'd like to return the collection bey read-only, so that the calling code is unable to make changes to the collection, only view what's already there. Is this at all possible?

-HashTable ve Sorted List: Bu dü derslikın çkızılışma prensipleri birbirine çok yakındır. Bir bölgede iki sayı data barındırırlar. Bunlar ‘Key’ ve ‘Value’dur. Verdiğimiz ‘Key’ değeri unique cereyan etmek ve null olmamak zorundadır. HashTable ve SortedList, verilere ulaşırken barındırdıkları unique anahtarları kullanarak ulaşırlar. Böylelikle aldıkları verilere bir nevi Identity kolonuna bandajlamış olurlar. Key bileğerleri atandıktan sonra asla bileğsorunmez.

Gürlük: Kuyruk konstrüksiyonsı, verilerin sıralı olarak ustalıklenmesi müstelzim katı çok senaryoda kullanılır ve bu perese nominalmın başarımını zaitrabilir.