Greatest Kılavuzu C# IEnumerable Nerelerde Kullanılıyor için

Greatest Kılavuzu C# IEnumerable Nerelerde Kullanılıyor için

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, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more veri than is actually needed, and we waste cycles doing the filtering in the client.

Lakin şuana derece yapmış evetğumuz tüm konulemler döngü değmedarımaişetkeninin object olarak gelmesini esenlamaktadır. O yüzden direkt olarak cast anlayışlemi uygulatıyor, “var” yerine “Personel” tipini kullanıyorum.

I understand why IQueryable is better choice for "out-of-memory" veri but I am struggling to understand why IEnumerable is better for "in-memory" data? I still think it's better to get filtered veri than to get get veri and apply filter.

It's effectively usage birli documentation of intent; I find that those explicit documentations of intent tend to provide exactly that decoupling you point out.

By adding on a Where statement you aren't actually doing much of anything, you're just adding an extra filter to the query so that later on, when you actually evaluate the sequence (in this case, when ToList is called) those filters will all be applied.

The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn saf a Current property and a MoveNext method that returns a bool. I hayat highly recommend Eric Lipperts blog post about pattern matching

Şimdi bu ifadelerin henüz celi olması karınin bir örnek üzerinden gidelim ve bir önceki makaslamakmızda custom Enumerator dershaneı ile yazdığımız Alisveris Sepeti iterator örneği çizgiırlayalım:

Coming soon: Throughout 2024 we will be C# IStructuralComparable Kullanımı phasing out GitHub Issues as the feedback mechanism for content and replacing it with a new feedback system. For more information see: .

Nobody mentioned one crucial difference, ironically answered on a question closed kakım a duplicated of this. IEnumerable is read-only C# IStructuralComparable Temel Özellikleri and List is hamiş.

List, on the other hand, is a specific implementation of IEnumerable that stores the objects in a specific, known manner. Internally, C# IStructuralComparable Temel Özellikleri this may be a very good way to store your values that you expose via IEnumerable, but a List is hamiş always appropriate.

It is cleaner, your users don't get a list where C# IStructuralComparable Kullanımı they shouldn't (they could cast it to a Listafter all) and you don't need to create a Listobject.

Consider the below simple code which uses IEnumerable with entity framework. It’s using a Where filter to get records whose EmpId is 2.

If you create an IEnumerable, then all rows will be pulled into memory bey objects before running the query.

The first method advances to the next C# IStructuralComparable Kullanımı object in the IEnumerable object that created the enumerator, returning false if it's done, and the second returns the current object.