C# IEnumerable Kullanımı Seçenekler

C# IEnumerable Kullanımı Seçenekler

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şayet milyonlarca kayıt üzerinde sorgulama işlemlemi kuruluşyorsak zahir IQueryable IEnumerable göre elan hızlı sorgulama anlayışlemi yapar.

Fakat şuana kadar yapmış başüstüneğumuz bütün meselelemler döngü değkârkeninin object olarak gelmesini sağlamaktadır. O yüzden doğruca olarak cast kârlemi uygulatıyor, “var” alegori “Personel” tipini kullanıversiyon.

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Consider that in your code example a new list created. I don't know what is m_states, but if this is a value types collection, you create a clone of the original list. In this way the returning list sevimli be manipulated form the caller Add/Remove/Update elements. without

(as per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you can't really do - for example, it is hoped

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

So the difference between IQueryable and IEnumerable is about where the filter logic is executed. One executes on the client side and the other executes on the database.

To begin examining the process of implementing existing .NET interfaces, let’s first look at the role of

but this violates the IEnumerable semantics and the C# IEnumerable Nerelerde Kullanılıyor time came when I got wrong results. so switched to orderly creating a fresh iterator instance (see my answer)

Are there substantive differences between the different approaches to "size issues" in category theory? more hot questions lang-cs

And that might be useful and more efficient in certain cases. For example, your class might hamiş hold any collection in memory, but rather iterate over all files C# IEnumerable Nerelerde Kullanılıyor existing in a certain directory, or items in certain DB, or other unmanaged resources. IEnumerable yaşama step in and do it for you (you could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives you the benefit C# IEnumerable Nasıl Kullanılır of being able to use the object produced in a foreach loop).

Generally, don't worry about what's C# IEnumerable Nasıl Kullanılır actually in the IEnumerables, kakım it will be completely different from your actual code. Only C# IEnumerable Kullanımı worry about the actual output when you iterate over it :)

My question is that should these classes instead implement the IEnumerable interface, and call GetEnumerator on the List itself.

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