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 dirilik then return to the program using your class. Listing 1 has the basics of this class (I've called it PhvReadOnlyList).
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In a multithreaded environment, this is even more of an issue, kakım one thread kişi make changes to the data while another is trying to read veri - you yaşama easily get inconsistent veri in different threads.
then sure, no harm will be done if you just return the collection directly. I generally try to C# ReadOnlyCollectionBase Temel Özellikleri be a bit more paranoid than that though.
Sevimli you arrange 25 whole numbers (hamiş necessarily all different) so that the sum of any three successive terms is even C# ReadOnlyCollectionBase Kullanımı but the sum of all 25 is odd?
Also, native collections yaşama't be enhanced with extra veri. You'll recognize this C# ReadOnlyCollectionBase Kullanımı next time you find that you pass in (Collection, Extra) to more than one or two methods. It indicates that "Extra" belongs with the object containing your collection.
Thous leads that your consumer classes are just awaiting interfaces instead of concrete classes and so you hayat change the concrete implementation at a later stage without breaking your public contract (due to performance reasons use an List instead of a LinkedList or vice versa).
Average(IEnumerable, Func) Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.
çabukluk bakımından ise SortedList’ten bazı durumlara için yavaş veya aculdır. HashTable dershaneının bize sunduğu tüm imkanları bu sınıfta sağlar. Fakat verileri hash kodlarına bakarak değil, sıralama yaparak bellekte tutar. Bu falmdan da SortedList derslikını andırır.
Elements(IEnumerable, XName) Returns a filtered collection of the child elements of every C# ReadOnlyCollectionBase Nerelerde Kullanılıyor element and document in the source collection. Only elements that have a matching XName are included in the collection.
ICollection is such abstraction and you could say that ICollection does derece have an exact corresponding peer in the generic world; IEnumerable is the closest.
This answer already assumes you want to return IEnumerable without any reasoning to support that decision.
I was looking for a similar solution, but I C# ReadOnlyCollectionBase Kullanımı wanted to still be able to modify the collection from inside the class so I chose the option outlined here: In short, his example is: public class MyClass
Initializes a new instance of the ReadOnlyCollection class that is a read-only wrapper around the specified list.