C# ReadOnlyCollectionBase Nedir Hakkında Gerçekler Açığa

C# ReadOnlyCollectionBase Nedir Hakkında Gerçekler Açığa

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

In programs, an immutable collection can be used with less copying—we do derece need to worry about it being modified. This can make programs simpler and easier to reason about.

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 3 1 I would second here on using the readonly keyword for the variable bey well. Without this, anyone might fall into an impression that since the collection is of type ReadOnlyCollection so I'm completely safe from any possibility of changes being done to my collection when it is hamiş the case.

List's are a very common datastructure, but creating them in this fashion involves quite a bit of syntactic noise - and it gönül easily get even worse (e.g.

Sum(IEnumerable, Func) Computes the sum of the sequence of Double values that are obtained by C# ReadOnlyCollectionBase Temel Özellikleri invoking a transform function on each element of the input sequence.

The single line of code required by my extension method just instantiates my PhvReadOnly class (using the datatype that the extension method saf deduced), passing whatever IList object the extension method is being used on.

Matthew WatsonMatthew Watson 108k1111 gold badges170170 silver badges290290 bronze badges 2 2 To avoid that a client gets a writable object by downcasting, WritableMyItem (and IWritableMyItem if used) could be made private or internal.

It depends on how much you trust the calling code. If you're in complete control over everything that will ever call this member and you guarantee

This article discusses these read-only immutable collection types in .Kemiksiz Core and how you yaşama work with them in C#.

Elements(IEnumerable, XName) Returns a filtered C# ReadOnlyCollectionBase Kullanımı collection of the child elements of every element and document in the source collection. Only elements that have a matching XName are included in the collection.

Implementers are encouraged to extend this base class instead of creating their own. Members of this base class are protected and are intended to C# ReadOnlyCollectionBase Temel Özellikleri be used through a derived class only.

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

Eamon NerbonneEamon Nerbonne 47.7k2020 gold badges102102 silver C# ReadOnlyCollectionBase Nasıl Kullanılır badges169169 bronze badges 1 So, I've actually got an open source library which includes an IArray interface that I C# ReadOnlyCollectionBase Kullanımı believe is ideal for precisely this purpose. See my updated answer for a bit more info.

So, you emanet define your collection kakım a private field and expose it birli a public readonly property like below kakım _parents