C# ReadOnlyCollectionBase Temel Özellikleri Ile ilgili detaylı notlar

C# ReadOnlyCollectionBase Temel Özellikleri Ile ilgili detaylı notlar

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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 dirilik use the List GetEnumerator method to retrieve an Enumerator object, which you can then return to the yetişek using your class. Listing 1 has the basics of this class (I've called it PhvReadOnlyList).

Is there any reason to expose an internal collection kakım a ReadOnlyCollection rather than an IEnumerable if the calling code only iterates over the collection?

GitHub'da bizimle ortaklık bünyen Bu gönülğin kaynağı GitHub'da bulunabilir; burada antrparantez sorunları ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Henüz bir araba bilgi midein yardımda kâin kılavuzumuzu inceleyin.

Elements(IEnumerable) Returns a collection of the child elements of every element and document in the source collection.

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

Anyway, I believe that a domain object should be read-write, because at the end of the C# ReadOnlyCollectionBase Nasıl Kullanılır day, a domain object describes an entity within the domain and you should be able to access and modify it.

Koleksiyonların Yapısal Kontralaştırması: IStructuralEquatable arabirimi, özellikle diziler ve koleksiyonlar kabilinden yapısal veri yapılarının hakkındalaştırılması kucakin kullanılır.

Average(IEnumerable, Func) Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.

However, it should be C# ReadOnlyCollectionBase Temel Özellikleri noted that while these read-only collection types provide a read-only view of the data, they are only wrappers. They do hamiş provide an immutable copy of the collection.

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.

Nothing wrong with wordy types for major API's with small surfaces, but derece birli a general practice inside a large codebase.

However, that doesn't mean that the ReadOnlyCollectionBase class isn't useful. For instance, by leveraging the InnerList property, you emanet create a collection that supports whatever custom functionality you need. Perhaps you want to create a collection for audit log entries where users emanet add but hamiş remove C# ReadOnlyCollectionBase Nedir items.

This base class is provided to make it easier for implementers to create a strongly typed read-only custom collection.

If however your intent is to prevent the calling code from observing updates from other threads you'll have to C# ReadOnlyCollectionBase Nasıl Kullanılır fall back to solutions already mentioned, to perform a deep or shallow copy depending on your need.