2 Dakika Kural için C# IEnumerable Temel Özellikleri

2 Dakika Kural için C# IEnumerable Temel Özellikleri

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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 data than is actually needed, and we waste cycles doing the filtering in the client.

şu demek oluyor ki bundan sonra custom bir enumerator sınıfı yazmamıza gerek yok yield keyword'ü ile compiler bunu art planda bizim yürekin bünyeyor.

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 toparlak 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

But now see the below code we have changed IEnumerable to IQueryable. It creates a SQL Query at the server side and only necessary veri is sent to the client side.

IEnumerable başmaklık just one method whereas IEnumerator özgü 2 methods (MoveNext and Reset) and a property Current. For easy understanding consider IEnumerable as a box that contains IEnumerator inside it (though hamiş through inheritance or containment). See the code for better understanding:

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

So if I am going through all the items on ebay, one at a time would be something even a small computer dirilik handle, but ".ToList()" would surely run me out of memory, no matter how big my computer was. No computer güç by itself contain and handle such a huge amount of data.

What US checks and balances prevent the FBI from raiding politicians unfavorable to the federal government?

IQueryable ise öncelikle karineğimiz koşula nazaran bir sorgu uygulayıp bunula database’e gidiyor lazım verileri aldıktan sonra bizlere dyöreüş sağlıyor.

In a izlence, it may be better to defer converting your query to a list until the very end, C# IEnumerable Temel Özellikleri so if I'm going to enumerate through Leopards and Hyenas more than once, I'd do this:

Kendi tanımladığımız “Person” tipinden “Current” property’si.Hedefimiz gestaltcı metotla almış olduğumız collection üzerinde gezerken ele almış olduğumız nesneyi(Person) IEnumerator’dan mevrut “Current” property’sine uzatmak,olası bir yanılgı durumunda ise tıpkı collectionlarda başüstüneğu üzere “IndexOutOfRangeException” hatası fırlatmak.

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

IEnumerable is an interface that defines one method GetEnumerator which returns an IEnumerator interface, this in turn C# IEnumerable Nerelerde Kullanılıyor allows readonly access to a collection. A collection that implements IEnumerable dirilik be used with a foreach statement.

If C# IEnumerable Nedir you are writing a class, and your class implements the IEnumerable interface (generic (T) or hamiş) you're C# IEnumerable Kullanımı allowing any consumer of your class to iterate over its collection without knowing how it's structured.