, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more veri than is actually needed, and we waste cycles doing the filtering in the client.
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.
Projeyi yayınladıgınız hin user secrets kullanılmıyor. Bu sadece geliştirme aşamasında kullanılabilir.
Tamam. Şu anne derece hiç IEnumerable ve IEnumerator interfacelerini kullanmadım diyebiliriz. Haydi gelin şimdi bu interfaceleri hiç hareketsiz ele alalım ve bu tam mafevkdaki satırlarda bahsettiğimiz GetEnumerator metodunuda tam teferruatlı masaya yatıralım.
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.
What I do is make C# IEnumerable Kullanımı a class that implements both IEnumerator and IEnumerable. Make GetEnumerator() return itself and you yaşama iterate it like uygun.
The primary difference is that the LINQ operators for IQueryable take Expression objects instead of delegates, meaning the custom query logic C# IEnumerable Kullanımı it receives, e.g., a predicate or value selector, is in the form of an expression tree C# IEnumerable Nasıl Kullanılır instead of a delegate to a method.
It has a good performance when you are iterating through big objects or collections because it does not load the entire object to memory in C# IEnumerable Nasıl Kullanılır order to make iteration.
Bu şekilde koleksiyon karınindeki elemanlara sırasıyla muvasala sağlanabilir. Adida bu yararlanmaı gösteren bir örnek bulunmaktadır:
This works for read-only access to a collection that implements that IEnumerable kişi C# IEnumerable Nedir be used with a foreach statement.
Any idea why the Enumerable is "split" into "inner" and "outer"? This happens when I inspect the element in debug/break mode via mouse. Is this perhaps Visual Studio's contribution? Enumerating on the tanıtımcık and indicating input and output of the Enum?
The reason, of course, is that someone kişi call the first method passing in an array object, a List object, a String object, and so on — any object whose type implements IEnumerable.
On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying not to commit yourself to a specific type). Share Follow
Why does the Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?