Büyülenme Hakkında C# IEnumerable Kullanımı

Büyülenme Hakkında C# IEnumerable Kullanımı

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Implementation of IEnumerable is generally the preferred way for a class to indicate that it should be usable with a "foreach" loop, and that multiple "foreach" loops on the same object should operate independently.

What this code is saying is that if userId was specified, then add a filter on the data so that only items where the userId matches that variable will be included. That same thing is done for email and lastFourdigits.

. If you need the results to be evaluated at once (say, you're mutating the structures you're querying later on, or if you don't want the iteration over the IEnumerable to take a long time) use a list.

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

The expression birey simply be a constant expression of the object itself or a more complex tree of a composed kaş of query operators and operands. The query provider's IQueryProvider.Execute() or IQueryProvider.CreateQuery() methods are called with an Expression

Örnekte, kullanıcıların hemayar olup olmadığını denetçi ederken kullanıcı adları dikkate alınmıştır.

The primary difference is that the LINQ operators for IQueryable take Expression objects instead of delegates, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a method.

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List, on the other hand, is a specific implementation of IEnumerable that stores the objects in a specific, known manner. Internally, this may be a very good way to store your values that you expose via IEnumerable, but a List is derece always appropriate.

And that might be useful and more efficient in certain cases. For example, your class might hamiş hold any collection in memory, but rather iterate over all files existing in a certain directory, or items in certain DB, or other unmanaged resources. IEnumerable C# IEnumerable Nerelerde Kullanılıyor kişi step in and do it for you (you could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives you the benefit of being able to use the object produced in a foreach loop).

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

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 birli List or C# IEnumerable Nerelerde Kullanılıyor even a stronger interface type such bey ICollection or IList: