Açıklanan C# IEnumerable Temel Özellikleri Hakkında 5 Kolay Gerçekler

Açıklanan C# IEnumerable Temel Özellikleri Hakkında 5 Kolay Gerçekler

Blog Article

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

Umarım bu bahis için kafanızda bir fikir oluşturabilmişimdir.Bu yazı muhtevain oluşturduğum projenin kodlarını GitHub hesabımdaki “MyArticlesCodes” repository’sinde bulabilirsiniz.

Şu anda etken olarak web ve taşınabilir projeler geliştiriyorum ve 2013 yılından beri makale tahrir ile yan yana YouTube ve Udemy platformlarında video karınerik üretiyorum.

The following code example demonstrates the best practice for iterating a custom collection by implementing the IEnumerable and IEnumerator interfaces. In this example, members of these interfaces are not explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.

An Enumerable is a class that gönül give you Enumerators. It has a method called GetEnumerator which gives you an Enumerator that looks at its items. When you write a foreach loop in C#, the code that it generates calls GetEnumerator to create the Enumerator used by the loop.

The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn katışıksız a Current property C# IEnumerable Kullanımı and a MoveNext method that returns a bool. I can highly recommend Eric Lipperts blog post about pattern matching

// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.

For small result sets this is likely to be a C# IEnumerable Kullanımı single trip, for large ones you're sending a request for more rows from the results, but it C# IEnumerable Nedir doesn't re-run the entire query.

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

When you write a query using IEnumerable C# IEnumerable Nerelerde Kullanılıyor you are using the advantages of deferred execution and your query running when it accessed.

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

Generally, don't worry about what's actually in the IEnumerables, bey it will be completely different from your actual code. Only worry about the actual output when you iterate over it :)

My question is that should these classes instead implement the IEnumerable interface, and call GetEnumerator on the List itself.

When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. For example, if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using an interface such kakım IEnumerable rather than using a strong data type such as List or even a stronger interface type such bey ICollection or IList: