C# IEnumerable Temel Özellikleri - Genel Bakış

C# IEnumerable Temel Özellikleri - Genel Bakış

Blog Article

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

Many of the LINQ methods, including Where, use deferred execution. In this case you can think of the IEnumerable bey a query, rather than the actual result kaş.

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

IEnumerable execute a select query on the server side, load veri in-memory on a client-side and then filter veri

IEnumerable başmaklık just one method whereas IEnumerator katışıksız 2 methods (MoveNext and Reset) and a property Current. For easy understanding consider IEnumerable birli a box that contains IEnumerator inside it (though not through inheritance or containment). See the code for better understanding:

Örnekte, kullanıcıların yeksan olup olmadığını kontrol ederken kullanıcı adları dikkate münfailtır.

C# 8.0, bu sınıfların asenkron karşıtlıkları olarak düşenebileceğimiz Asynchronous Streams esaslığı şeşndaki IAsyncEnumerable ve IAsyncEnumerator alternatiflerini getirmiş bulunmaktadır.

Şimdi makalemizin bu noktasına gelen okuyucularımın kafalarında muhakemesini yapmış oldukları sermayeşmalar titrırım üç aşağı beş yukarı dunda kestirim ettiğime benzeşim niteliktedir.

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 güç force it to iterate sooner using .ToList().

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

Oh sure, you birey use it to create C# IStructuralComparable nedir your own custom collection types. But for everyday stuff, it probably isn't kakım useful bey the collections derived from it.

There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself C# IStructuralComparable Temel Özellikleri and kişi perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until C# IStructuralComparable Temel Özellikleri the enumeration begins (i.e. until you run the foreach loop).

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

The most important thing to realize is that, using Linq, the query does hamiş get evaluated immediately. It is only C# IStructuralComparable Temel Özellikleri run birli part of iterating through the resulting IEnumerable in a foreach - that's what all the weird delegates are doing.