The Ultimate Guide To C# IEnumerable Nasıl Kullanılır

The Ultimate Guide To C# IEnumerable Nasıl Kullanılır

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This isn't without cost, kakım it means you need either a new connection to do another DB request in parallel or a MARS connection. Too much for a comment really

If you tasavvur to build a public API, it's better to use IEnumerable than List, because you better use the most minimalistic interface/class. List lets you access objects by index if that's required.

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 ferde 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.

To get them I use VisualTreeHelper class. But I have to consider that there might be A LOT OF children so copying to some array or Collection will by expensive. – drasto 5 mins ago

Basically it başmaklık 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 runs out.

Velhasıl… Yaptığımız bu alışverişlemler neticesinde “Personeller” sınıfımız, içinde bir “Personel” done kümesi barındıran ve bu veri kümesi üzerinde itere edilebilir bir nitelik yer eden bir sınıf mahiyetindedir.

Oluşturduğunuz sınıfı, koleksiyon oluştururken yahut katlaştırma gerektiren diğer senaryolarda kullanabilirsiniz.

Your linq expression returns an enumeration, and by default the expression executes when you iterate through using the foreach. An IEnumerable linq statement executes when you iterate the foreach, but you kişi force it to iterate sooner using .ToList().

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 C# IEnumerable Nedir 1 The mistake with "Reset" was with just having one type of enumerable. IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and guarantee that multiple passes will either return identical veri or throw an exception; an ordinary IEnumerable C# IEnumerable Nerelerde Kullanılıyor whose collection was modified should be allowed to return 'sensible' veri if it's able to do so or throw an exception if it dirilik't, and an ISafeEnumerable, which would be expected to C# IEnumerable Kullanımı work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.

It's for when you want to be able to use an object with a C# IEnumerable Temel Özellikleri foreach loop, but you don't know exactly what type you're dealing with, whether Array, List, or something custom.

I think if your newly implemented class just behaves the sameway as a list does, there is no need to implement it. If you need some kind of custom logic, it depends on what you want to do; you sevimli inherit list or you gönül implement IEnumerable. It just depends what is to be achieved.

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 and you found what you needed) you might derece need to read the whole file. Or if you're reading the results from a large SQL query you kişi limit your memory use to a single record.

You should still avoid declaring the parameter type bey List. Using IList allows the C# IEnumerable Nedir caller to pass arrays and any other objects whose type implements IList.