driisdriis 163k4545 gold badges268268 silver badges343343 bronze badges 3 Sorry, but even now there are plenty of uses for library code to use IList (non-generic). Anyone who says otherwise hasn't suffered enough reflection / data-binding / etc ;)

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If you think that interfaces are useful only for building over-sized, grandiose architectures and have no place in small shops, then I hope that the person sitting across from you in the interview isn't me.

Typically, a good approach is to use IList in your public facing API (when appropriate, and list semantics are needed), and then List internally to implement the API. This allows you to change to a different implementation of IList without breaking code that uses your class.

I would turn the question around a bit, instead of justifying why you should use the interface over the concrete implementation, try to justify why you would use the concrete implementation rather than the interface. If you birey't justify it, use the interface.

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the C# IList Nedir method, it kişi make a huge difference -- if they have an array and you're asking for a list, they have to change the array to a list or v.v. whenever calling the method, a total waste of time from both a programmer and performance POV.

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I know that IList is the interface and List is the concrete type but I still don't know when to use each one. What I'm doing now is if I don't need the Sort or FindAll methods I use the interface. C# IList Nedir Am I right? Is there a better way to decide when to use the interface or the concrete type?

This is usually guaranteed for a specific implementation of a container (List documentation: "It implements the IList generic interface using an array whose size C# IList Kullanımı is dynamically increased kakım required.").

You kişi pass a plain array to something which accepts an IList parameter, and then you hayat call IList.Add() and will receive a runtime exception:

The other general reason for using interfaces is to expose the asgari amount of C# IList Nerelerde Kullanılıyor knowledge necessary to the user of an object. C# IList Nedir Consider the (contrived) case where I have a data object that implements IList.