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

Define your own class which implements IEnumerator, takes an IList in the new constructor, has a read only default item property taking an index, and does derece include any properties/methods that could otherwise allow your list to me manipulated.

-ArrayList: Dizinin benzeridir ama yalnızca object tipinden verileri saklar. Zımnında da gönderilen veri object değilse boxing konulemine bağımlı tutulur.

Gönül you arrange 25 whole numbers (derece necessarily all different) so that the sum of C# ReadOnlyCollectionBase Temel Özellikleri any three successive terms is even but the sum of all 25 is odd?

Ancestors(IEnumerable, XName) Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Only elements C# ReadOnlyCollectionBase Temel Özellikleri that have a matching XName are included in the collection.

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

Koleksiyonların Konstrüktif Mukabillaştırması: IStructuralEquatable arabirimi, özellikle diziler ve koleksiyonlar kabil strüktürel done yapılarının hakkındalaştırılması dâhilin kullanılır.

protected virtual ICollection EmployeesInternal get; private set; = new List(); // this will expose collection contents to public, seemingly unneccessary `Skip` statement will prevent casting back to Collection

Any idea why IList doesn't inherit from ICollection? Since the latter is basically IEnumerable plus Count, and since IList already katışıksız a Count method, having IList inherit ICollection wouldn't have required any more work for implementers, but would have allowed someone with an IList to know how many items to expect from an enumeration.

If you take advantage of IntelliSense in Visual Studio to see the members of the authors list object, you’ll see a list of methods supported by List.

Nothing wrong with wordy types for major API's with C# ReadOnlyCollectionBase Temel Özellikleri small surfaces, but hamiş kakım a general practice inside a large codebase.

This answer already assumes you want to return IEnumerable without any reasoning to support that decision.

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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