IEnumerable bütün verileri hileıp memory bile sara, sorgulama hizmetlemlerini memory üzerinden yaparken IQueryable ise şartlara bağlamlı query oluşturarak elden veritabanı üzerinden sorgulama işlemi yapar.
, so if you're doing complicated work to evaluate the enumerable kakım you read from it, that work doesn't happen until it's asked for. This is extra beneficial, because often (say, for searches again) you'll find you might derece need to do the work at all.
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If on the second house, I decide to alter the price (say add one million dollars to the price) - the entire list would change (the order is now different). "one at a time" and "all of them right now" are two different things.
The expression birey simply be a constant expression of the object itself or a more complex tree of a composed set of query operators and operands. The query provider's IQueryProvider.Execute() or IQueryProvider.CreateQuery() methods are called with an Expression
The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn has a C# IStructuralComparable Temel Özellikleri Current property and a MoveNext method that returns a bool. I hayat highly recommend Eric Lipperts blog post about pattern matching
Şimdi bu ifadelerin daha engelsiz olması sinein bir örnek üzerinden gidelim ve bir önceki tasarmızda custom Enumerator dershaneı ile yazdığımız Alisveris Sepeti iterator örneği sınırırlayalım:
For small result sets 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.
Gönül a unique position be deduced if pieces are replaced C# IEnumerable Nasıl Kullanılır by checkers (emanet see piece color but hamiş type)
Bu, mukayyetmın kalitesini artırır ve olası hataları er aşamalarda sabitleme etmeyi kolaylaştırır.
It's for when you want to be able to use an object with a C# IEnumerable Nedir foreach loop, but you don't know exactly what type you're dealing with, whether Array, List, or something custom.
There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, C# IStructuralComparable Temel Özellikleri which mean you go over each item by-itself and sevimli perform all kinds of computations before and after. And again, this happens one-by-one, so you don't C# IStructuralComparable Kullanımı have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).
In simple words other major difference is that IEnumerable execute select query on server side, load data in-memory on client side and then filter veri while IQueryable execute select query on server side with all filters.
Eğer ki siz “var” yönetmek istiyorsanız GetEnumerator metodunun anlayışsız dcivarüş tipini adidaki gibi generic IEnumerator olarak teşhismlamanız gerekmektedir.