The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does not, at least not in general terms for those of us who don't work in the secret labs of Microsoft.
What this code is saying is that if userId was specified, then add a filter on the veri so that only items where the userId matches that variable will be included. That same thing is done for email and lastFourdigits.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
IEnumerable execute a select query on the server side, load veri in-memory on a client-side and then filter veri
I have writen about custom IEnumerator. Whats the simplest way to make IEnumerable from it ? Ideal solution (one line of code) would be if there was some class for that purpose. Or do I have to create my own ?
The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn katışıksız a Current property and a MoveNext method that returns a bool. I kişi highly recommend Eric Lipperts blog post about pattern matching
Bu yöntemler sebebiyle, ölçünlü muhaliflaştırma mantığını değdavranıştirerek özel nöbetlemler yapabilir ve uygulamanızın performansını ve doğruluğunu zaitrabilirsiniz.
Short story about a kamet living C# IEnumerable Temel Özellikleri on a fake tropical island / paradise planet, who was actually an adult CEO but didn't remember it
So you have a common IEnumerator-implementing class for all ten, and each collection just başmaklık to implement IEnumerable using that enumerating class. It's about separation of concerns, treating holding veri and enumerating veri birli separate operations.
Using the concept of iterators you kişi achieve major improvement C# IEnumerable Kullanımı in algorithm quality, both in terms of speed and memory usage.
Coming soon: Throughout 2024 we will be phasing out GitHub Issues birli the C# IEnumerable Nasıl Kullanılır feedback mechanism for content and replacing it with a new feedback system. For more information see: .
IEnumerable is an interface that tells us that C# IEnumerable Nerelerde Kullanılıyor we güç enumerate over a sequence of T instances. If you need to allow somebody C# IEnumerable Nasıl Kullanılır to see and perform some action for each object in a collection, this is adequate.
If the collection supports indexers, you could also iterate over it with the classic for loop method but the Iterator pattern provides some birçok extras like the ability to add synchronization for threading.
In addition to all the answers posted above, here is my two cents. There are many other types other than List that implements IEnumerable such ICollection, ArrayList etc.