En Kuralları Of C# ReadOnlyCollectionBase Temel Özellikleri

En Kuralları Of C# ReadOnlyCollectionBase Temel Özellikleri

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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 data in a List, then you kişi use the List GetEnumerator method to retrieve an Enumerator object, which you hayat 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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. Why not return IEnumerable? Calling code would have to cast, which they are unlikely to do without knowing the internals of the property they are accessing.

Which means that I always have to cast the items back to MyItem when I want to use them. Also the items güç be casted into MyItem outside the class.

The following code snippet illustrates how IReadOnlyList hayat be used in place of List in the above method.

İsimleri farklı olsa da generic sınıflardan sadece 1 tanesi (LinkedList) baştan aşağı değişikdır. Diğerleri generic olmayan akrabalarıyla misil şekilde çhileışmaktadır.

On the other hand, if you're exposing a read-only view of a mutable collection, then this advice is still valid, although I would probably expose it birli IReadOnlyCollection (which didn't exist when I wrote this).

An immutable object is defined kakım an object that cannot be changed after it saf been created. Hamiş all collections are immutable, but you birey use the read-only collection types in .

I've implemented AReadOnlyList as a read-only property because I'm assuming that if you don't want programs adding or removing items from your collection, you probably don't want programs shoving whole new collections into your property, either. Simplifying Code with C# ReadOnlyCollectionBase Temel Özellikleri Extension Methods

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

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

If you need to do more than the InnerList property C# ReadOnlyCollectionBase Nerelerde Kullanılıyor will let you, the base class Items property will hand you back the whole List. Kakım I said, creating a read-only collection class in .

Chances are, C# ReadOnlyCollectionBase Nasıl Kullanılır you'll never notice this difference, but if this is C# ReadOnlyCollectionBase Nedir a hot-spot in your code and requires every last bit of performance you birey squeeze out of it, C# ReadOnlyCollectionBase Nerelerde Kullanılıyor why not use an Array instead? That would be faster still.