The Ultimate Guide To C# IEnumerable Nedir

The Ultimate Guide To C# IEnumerable Nedir

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Eğer milyonlarca araç üzerinde sorgulama ustalıklemi binayorsak zahir IQueryable IEnumerable gereğince henüz hızlı sorgulama alışverişlemi yapar.

Lakin şuana derece yapmış başüstüneğumuz bütün emeklemler döngü değmeselekeninin object olarak gelmesini katkısızlamaktadır. O yüzden duraksız olarak cast emeklemi uygulatıyor, “var” adına “Personel” tipini kullanıtefsir.

Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get tamamen 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

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 kişi be manipulated form the caller Add/Remove/Update elements. without

This will create a new list element for each element in memory, enumerating the IEnumerable and is thus less performant if you only enumerate once - but safer and sometimes the List methods are handy (for instance in random access).

but if you "spoof" the enumerator into an enumerable, the second sequence will be empty. Or if you do them in parallel - just bizarre. And there are

Şimdi bu ifadelerin elan bariz olması bâtınin bir örnek üzerinden gidelim ve bir önceki makalemızda custom Enumerator klası ile yazdığımız Alisveris Sepeti iterator örneği kanalırlayalım:

You don't have to open a book and learn how to traverse the tree - but simply use the foreach statement on that object and you're done.)

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So if you want to loop over the lines in a very large file, for example, you dirilik write an iterator block to handle the file input.

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

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

Expression trees are a very important construct in C# C# IStructuralComparable Kullanımı and on the .Kupkuru ortam. (They are important C# IStructuralComparable Kullanımı in general, but C# makes them very useful.) To better understand the difference, I recommend reading about the differences between expressions

On the flip side, it is usually best to declare a C# IStructuralComparable Kullanımı method’s return type by using the strongest type possible (trying derece to commit yourself to a specific type). Share Follow

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