5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

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The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does hamiş, at least derece in general terms for those of us who don't work in the secret labs of Microsoft.

Koleksiyonlar Beyninde Gezinmeyi Sağlamlar: IEnumerable, koleksiyonlar arasında kolay gezinmenizi katkısızlar. GetEnumerator metodu ile koleksiyonun her bir elemanına erişebilir ve bu elemanlar üzerinde iş yapabilirsiniz.

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" veri? I still think it's better to get filtered veri than to get get veri and apply filter.

For example, if you do derece need to access items by index, but constantly insert items at the beginning of your collection and then remove items from the end, a Queue would be far more appropriate to use.

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

Basically it katışıksız a method to get the next item in the collection. It doesn't need the whole collection to be in memory and doesn't know how many items are in it, foreach just keeps getting the next item until it C# IStructuralComparable nerelerde kullanılıyor runs out.

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

It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however implementing IEnumerable is not C# IStructuralComparable Kullanımı required. If your collection does not implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator method that returns an interface, class or struct.

Yield ile kendimiz named iteretor'ler oluşturabiliriz. Örneğin programımızın 750TL den daha pahalı ürünleri getirmesini istiyoruz:

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

This yaşama be very useful in certain circumstances, for instance in a massive database table you don't want to copy the entire thing into memory before you start processing the rows.

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Then you'll never have more than one line of the file in memory at a time, and if you finish the loop earlier (perhaps it was a search C# IStructuralComparable Kullanımı and you found what you needed) you might hamiş need to read the whole file. Or if you're reading the results from a large SQL query you emanet limit your memory use to a single record.

In addition to all the answers posted above, here is my two cents. There are many other types other than List that implements IEnumerable such ICollection, ArrayList etc.