C# ReadOnlyCollectionBase Nasıl Kullanılır Aptallar için

C# ReadOnlyCollectionBase Nasıl Kullanılır Aptallar için

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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 veri in a class that itself implements IEnumerable -- a List, for instance. If you do keep your veri in a List, then you güç use the List GetEnumerator method to retrieve an Enumerator object, which you sevimli then return to the yetişek using your class. Listing 1 saf the basics of this class (I've called it PhvReadOnlyList).

Define your own class which implements IEnumerator, takes an IList in the new constructor, özgü a read only default item property taking an index, and does not include any properties/methods that could otherwise allow your list to me manipulated.

I was thinking about creating a new class derived from ReadOnlyCollection (class ReadOnlyMyCollection : ReadOnlyCollection or class ReadOnlyMyCollection : ReadOnlyCollection) which returns the read-only wrapper class (ReadOnlyMyItem) through the square brackets operator, but either the square brackets operator is hamiş marked bey virtual and the return type is not even the same or the constructor doesn't have an IList of the wrapper class (IList) to use. Should I build the class (ReadOnlyMyCollection) from scratch?

If your veri dirilik be enumerated, you emanet use Enumerable.ToList method to cast your collection to List and call AsReadOnly on it.

To work with the code examples provided in this article, you should have Visual Studio 2019 installed in your C# ReadOnlyCollectionBase Temel Özellikleri system. If you don’t already have a copy, you hayat download Visual Studio 2019 here.

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

Note also that this makes your sıkıntı particularly birçok. If you don't C# ReadOnlyCollectionBase Kullanımı want people changing the collections, your container need contain no mutators. If you decide later that in just one case you actually HAVE to modify it, you emanet create a safe C# ReadOnlyCollectionBase Nerelerde Kullanılıyor mechanism to do so.

HashTable hash kodlarına nazaran dizdiğinden mukannen bir sıralaması yoktur.Algoritması bu kodların ortamında gizlidr. Dictionary ise verilerin ekleniş sırasını hiç değkonutirmeden saklamıştır.

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

Elements(IEnumerable, XName) Returns a filtered 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.

Putting that all together, a class that exposes a read-only collection needs three things: A property of type PhvReadOnlyList

1 Gotta agree with DarkWanderer here. Collections should be just that: collections. There are many other ways to centralize business logic without breaking the single responsibility principle. Plus, making your collection more "clever" may actually confuse C# ReadOnlyCollectionBase Temel Özellikleri the using developer more than it helps him.

Anlaşılabilirlik ve Yararlanma Kolaylığı: C# Queue'un olağan ve anlaşılabilir yapısı, vüruttiricilerin katışıkşık alışverişlemleri yönetmesini kolaylaştırır.

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