Detaylar, Kurgu ve C# ReadOnlyCollectionBase Temel Özellikleri

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IEnumerable başmaklık been used to represent a read-only collection of data since the earliest versions of .NET. The read-only collection interfaces available in .NET Core and .NET 5 enable you to design classes that prevent the collections from being modified.

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Birli you suggest, my intention is only to protect the collection from direct modification; the collection members are derece going to be modified (or needed to be modified).

A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection; therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.

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

On the other hand, C# ReadOnlyCollectionBase Temel Özellikleri 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).

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

SkipLast(IEnumerable, Int32) Returns a new enumerable collection that contains the elements C# ReadOnlyCollectionBase Kullanımı from source with the last count elements of the source collection omitted.

If you do this then there's nothing stopping your callers casting C# ReadOnlyCollectionBase Kullanımı the IEnumerable back to ICollection and then modifying it. ReadOnlyCollection removes this possibility, although it's still possible to access the underlying writable collection via reflection.

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Inheriting from a non-generic base class would be ineffecient. If the type was using a non-generic base, all it would be would be a thin layer above the base collection, where the generic features would simply derive from casting from the underlying object instances of the base collection.

This base class is provided to make it easier for implementers to create a strongly typed read-only custom collection.

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