Why Does the C# `System.Array` Class Implement the `IList` Interface?
Dec 28, 2024 am 06:29 AMDelving into Array's Implementation of IList: Understanding the Rationale
The System.Array class in C# exhibits a unique characteristic: it implements the IList interface. While this concept may seem straightforward on the surface, the practicality of calling IList methods on an array might raise questions. This article aims to address the underlying reason behind this implementation, rather than focusing on the exception that arises when invoking certain methods.
Unveiling the Rationale
The answer to why Array implements IList lies in the inherent capabilities of an array. An array offers remarkably swift access through indexing, a feature not provided by other collection interfaces. Consequently, IList/IList
Questioning Interface Design
The lack of an interface specifically tailored for constant collections with indexers provokes further inquiry. Unfortunately, no definitive response can be offered at this time. Moreover, the absence of readonly interfaces for collections is also a notable omission that warrants consideration.
Re-evaluating Interface Design
In an ideal scenario, a comprehensive suite of (generic) collection interfaces would exist, each catering to specific collection features. The nomenclature should also be revised, as employing the term "List" for an indexed collection seems counterintuitive. A potential alternative hierarchy could include:
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Just Enumeration: IEnumerable
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Readonly with No Indexer: IReadOnlyCollection
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Resizable with No Indexer: ICollection
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Readonly with Indexer: IReadOnlyList
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Constant Size with Indexer: IReadOnlyIndexedList
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Variable Size with Indexer: IList
Addressing Interface Limitations
While the current collection interfaces may fall short of ideal, they adhere to the substitution principle by declaring the valid methods through properties, thereby preserving the integrity of interfaces.
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