List vs. IList: When Should You Choose the Interface Over the Concrete Class?

List

and iList choice In C#, select

or

often confusing. In order to understand their differences, let's explore why List<T> is better than IList<T> in some cases. IList<T> List<T> Why choose iList

instead of list

? The main reason is that when the class is made through the library, should be selected. The user of the library through interfaces and class interaction ensure that compatibility can be maintained even if it is achieved. Public and specific implementation, such as , will bring the risk of destroying the library function during future modification.

Example: IList<T> List<T>

Assume that a library discloses a method of accepting

. If you use to implement this method, follow -up changes (such as replacing it with a custom set) will require library users to update its code. In contrast, the use of to ensure that the interface remains unchanged, and it can maintain compatibility no matter how the underlying implementation. Internal use:

IList<int> However, these considerations are not so important for internal use cases. In this case, using is enough, because changes to implementation will not affect external users. List<int> IList<int> In short, the choice of

and

depends on the specific context and needs of the application. For the design of the library, is used to maintain flexibility and compatibility, and is suitable for internal use, which is not important to achieve details.

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