C# ReadOnlyCollectionBase Kullanımı A Gizli Silah

C# ReadOnlyCollectionBase Kullanımı A Gizli Silah

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

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

I avoid using ReadOnlyCollection as much bey possible, it is actually considerably slower than just using a uygun List.

SingleOrDefault(IEnumerable) Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

Bu sayede, veri bünyelarının mideindeki verilerin sıralanması veya içinlaştırılması fiillemleri özelleştirilebilir ve arama edilebilir hale hasılat.

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 C# ReadOnlyCollectionBase Nerelerde Kullanılıyor IList object the extension method is being used on.

Hangi derslik nerde kullanılmalı, bu sınıfların değişiklıkları neler, performansları nasıl kabilinden temelı soruları bu makalede alay malay arayalım.

Kodunuzda aynı meselelemi yekten fazla kez kullanmanız gerekiyorsa, bu konulemi bir metot bağırsakine koyabilirsiniz ve yine yeniden aynı kodu yazmanız C# ReadOnlyCollectionBase Nasıl Kullanılır gerekmez. Bu C# ReadOnlyCollectionBase Temel Özellikleri sayede kodunuz elan azca karmaşık hale hasılat ve daha palas yönetilebilir.

It's hamiş a concrete type like ReadOnlyCollection, so it doesn't tie you down to a specific implementation.

In Visual Basic, an extension method must be declared C# ReadOnlyCollectionBase Nasıl Kullanılır inside a Module and decorated with the Extension attribute. Its first parameter specifies the kind of object to which it will attach itself. I want my extension method to appear in the IntelliSense dropdown lists for any class that implements the IList interface, so I'll declare the method's first (and only) parameter kakım IList(of T) -- the compiler will figure out the type that T represents based on the List passed to my method.

This yaşama be a mesele when your class saf some invariants (guarantees about what it does and the data it holds) bey it cannot make guaranteed if other classes birey change its internals willy nilly.

Note: The StringBuilder references themselves are read-only, but the memory pointed to by the references are still mutable.

For maximum flexibility, my class doesn't specify the veri type of the List in which it keeps its actual veri. Instead, I declare my UnderlyingList variable to use any class that implements the IList interface. I've also made this a generic class: Rather than specify what kind of List I'm working with, I've forced my class to be instantiated with C# ReadOnlyCollectionBase Nerelerde Kullanılıyor a data type that the code refers to bey T. Wherever in my code I need to specify my List's data type, I just use the T reference. Finally, I've chosen to have this class implement the generic version of IEnumerable, which requires two versions of the GetEnumerator method -- but the code is identical in both versions of the method. Listing 1. The basics of the PhvReadOnlyList class.

The IReadOnlyCollection interface extends the IEnumerable interface and represents a basic read-only collection interface. It also includes a Count property apart from the IEnumerable members as shown in the code snippet given below.