Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

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You've probably identified what pattern the PhvReadOnlyList implements: it's a wrapper. In the .Kemiksiz Framework 4.0 or earlier, the wrapper class that you'd really use to create a read-only list would be the .Safi ReadOnlyCollectionBase class. Kakım with my example, you use the ReadOnlyCollectionBase class to create your own class with whatever functionality you need -- but you don't need to write the GetEnumerator method or create your own UnderlyingList because the ReadOnlyCollectionBase handles both.

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Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 3 1 I would second here on using the readonly keyword for the variable birli well. Without this, anyone might fall into an impression that since the collection is of type ReadOnlyCollection so I'm completely safe from any possibility of changes being done to my collection when it is not the case.

Objects everywhere), and it makes the construction wordier (emanet't use .ToList or collection initializers). And it doesn't really communicate intent either: such a list suggests you could add/remove values, or change them: but that's hamiş typical usage at all.

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Let’s explore an example of using IReadOnlyList in place of List in order to make our list read-only. Consider the following class:

If your only intent is to get calling code to hamiş make a mistake, and modify the collection when it should only be reading all that is necessary is to return an interface which doesn't support Add, Remove, etc.

ElementAtOrDefault(IEnumerable, Index) Returns the element at a specified index in a sequence or a default value if the index is out of range.

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However, the syntax is awkward. Adding an extension method gönül simplify that syntax tremendously. Extension methods have at least three convenient features: The first is that they attach themselves to whatever classes you specify, automatically appearing in the C# ReadOnlyCollectionBase Temel Özellikleri IntelliSense dropdown lists for those objects; second, they're automatically passed whatever object they're called from kakım their first parameter; third, when an extension method is used with a generic class (for instance, List), the method automatically figures out the data type of the generic parameter.

Average(IEnumerable, Func) Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Eamon C# ReadOnlyCollectionBase Nerelerde Kullanılıyor NerbonneEamon Nerbonne 47.7k2020 gold badges102102 silver badges169169 bronze badges 1 So, I've actually got an open source library which includes an IArray interface that I believe is ideal for precisely C# ReadOnlyCollectionBase Temel Özellikleri this purpose. See my updated answer for a bit more info.

This causes unnecessary boxing/unboxing of value types. One of the benefits C# ReadOnlyCollectionBase Temel Özellikleri of using generics is the avoidance of such boxing/unboxing which could have a detremintal effect on the performance of the C# ReadOnlyCollectionBase Kullanımı collections.