Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

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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 veri in a List, then you birey use the List GetEnumerator method to retrieve an Enumerator object, which you kişi then return to the program using your class. Listing 1 özgü the basics of this class (I've called it PhvReadOnlyList).

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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 .NET Framework 4.5 you yaşama use the read-only collections that Eric Vogel covered in an earlier C# Corner column, "The New Read-Only Collections in .Kupkuru 4.5," to define that property. My client, however, was working with the .NET Framework 4 and didn't intend to upgrade. Fortunately, in earlier versions of .Kemiksiz you birey 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 güç add items to but hamiş remove items from), inheriting from the ReadOnlyCollectionBase class makes that very easy to do.

Bir metodu güncellemek veya değişmek istediğinizde, sırf metodu değanlayıştirmeniz kifayetli olacaktır. Diğer harf alanlarına dokunmanıza lüzum kalmaz, bu da hataları önlemenizi ve projenizi henüz hızlı ve güvenilen bir şekilde güncellemenizi katkısızlar.

Imagine we have existing model with Organization => Employees already grup up. To apply this technique, we need to change Organization benzer a C# ReadOnlyCollectionBase Nasıl Kullanılır bit:

For this collection to be useful, however, you need to be able to load that internal list with your collection. The easiest way to do that is to add a constructor to the class that accepts the List to be put in the class' UnderlyingList collection (again, I'm accepting C# ReadOnlyCollectionBase Nedir anything that implements the IList interface with the veri type specified by T): Public Sub New(InitialList Kakım IList(Of T)) UnderlyingList = InitialList

Ne sınıf nerde kullanılmalı, bu sınıfların farklılıkları neler, performansları nasıl üzere temelı soruları bu makalede birlikte arayalım.

Özellikle verilerin belli bir sıraya bakılırsa hizmetlenmesi müstelzim durumlarda, Queue kullanımı yazılım projelerinin verimliliğini fazlalıkrabilir.

SkipLast(IEnumerable, Int32) Returns a new enumerable collection that contains the elements from source with the last count elements of the source collection omitted.

Key bileğerine göre bile bir indeksleyici barındırır. Bu arayüzlü C# ReadOnlyCollectionBase Kullanımı koleksiyonların seçilme sebebi indeks bileğerlerinin sabit kalma isteğidir. Bir bilgi silindiğinde arkasındaki verilerin indeks bileğerleri mıhlı kalır.

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However, a read-only collection doesn't provide Add and Remove C# ReadOnlyCollectionBase Kullanımı 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).

The following code example demonstrates several members of the ReadOnlyCollection class. The code example creates a List of strings and adds four dinosaur names to it. The code example then wraps the list in a ReadOnlyCollection.

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