This isn't without cost, birli 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
Bu dü arayüzün kullanım senaryoları farklıdır ve birbirlerinin yerine kullanılmamalıdır. Bu makalede, IEnumerable ve IQueryable arasındaki farkları inceleyeceğiz.
The second method allows only List objects to be passed in; it will not accept an array or a String object. Obviously, the first method is better because it is much more flexible and gönül be used in a much wider range of scenarios.
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.
This will create a new list element for each element in memory, enumerating the IEnumerable and is thus less performant if you only enumerate once - but safer and sometimes the List methods are handy (for instance in random access).
The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn özgü a Current property and a MoveNext method that returns a bool. I sevimli highly recommend Eric Lipperts blog post about pattern matching
IQueryable allows for out-of memory things like a remote veri source, such bey a database or web service.
For small result sets C# IEnumerable Temel Özellikleri this is likely to be a single trip, for large ones you're sending a request for more rows from the results, but it doesn't re-run the entire query.
Usually you don't use C# IEnumerable Nasıl Kullanılır IEunumerable directly. It is the base class for a number of other collections that C# IEnumerable Nedir you are more likely to use. IEnumerable, for example, provides the ability to loop through a collection C# IEnumerable Nasıl Kullanılır with foreach.
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 not always appropriate.
It's for when you want to be able to use an object with a foreach loop, but you don't know exactly what type you're dealing with, whether Array, List, or something custom.
But if your class cannot act like a collection then provide a public IEnumerable property for its elements:
JWT Claimlerle çkızılışmamız nasıl olmalı hocam sözde HttpContextAccessor'u filan devreye sokuyorduk
…IEnumerable interface’i ise bir sınıfa foreach mekanizması tarafından tanınması midein lüzumlu yetenekleri/nitelikleri kazandırır. Yani enumerator yapısını… Asıl : C#’ta IEnumerable ve C# IEnumerable Nerelerde Kullanılıyor IEnumerator Interfaceleri Nedir? ve Nasıl Kullanılır?