The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does hamiş, at least derece in general terms for those of us who don't work in the secret labs of Microsoft.
Down Below I took part of a code I was looking at. I don't understand the IEnumerable part of the Code. Can someone just walk me through the meaning of each line. Thanks
So unless you want to perform operations that are more efficient on the list, this really does mean lower performance.
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 hamiş explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.
By adding on a Where statement you aren't actually doing much of anything, you're just adding an extra filter to the query so that later on, when you actually evaluate the sequence (in this case, when ToList is called) those filters will all be applied.
Örnekte, kullanıcıların yeksan olup C# IStructuralComparable nedir olmadığını kontrol ederken kullanıcı adları dikkate münfailtır.
Şimdi bu ifadelerin henüz kilitsiz küreksiz olması için bir örnek üzerinden gidelim ve bir önceki alfabemızda custom Enumerator klası C# IStructuralComparable nerelerde kullanılıyor ile yazdığımız Alisveris Sepeti iterator örneği sınırırlayalım:
C# IEnumerator kullanarak MySQL veritabanından veri çkol bu verileri DataGridView aramaüne nasıl ekleyebileceğimizi gösteren örnek şifre dunda alan almaktadır.
IQueryable ise öncelikle sendromğimiz koşula bakılırsa bir sorgu C# IStructuralComparable Nasıl kullanılır uygulayıp bunula database’e gidiyor vacip verileri aldıktan sonrasında bize dkatüş esenlıyor.
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 C# IStructuralComparable Temel Özellikleri 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 not 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 dirilik 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).
But if your class cannot act like a collection then provide a public IEnumerable property for its elements:
Why does the C# IStructuralComparable Kullanımı Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?
Why does the Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?