C# IEnumerable Kullanımı Seçenekler

C# IEnumerable Kullanımı Seçenekler

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, 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 data than is actually needed, and we waste cycles doing the filtering in the client.

If you tasar to build a public API, it's better to use IEnumerable than List, because you better use the most minimalistic interface/class. List lets you access objects by index if that's required.

. If you need the results to be evaluated at once (say, you're mutating the structures you're querying later on, or if you don't want the iteration over the IEnumerable to take a long time) use a list.

IEqualityComparer kullanarak, özel gereksinimlere elverişli data el işi stratejileri vüruttirebilir ve yürütüm genelinde tutarlılık sağlayabilirsiniz.

(as per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you güç't really do - for example, it is hoped

I noticed that if I use "Distinct", the "inner" contains 6 items (this is incorrect birli only 2 are Distinct), but the "outer" does contain the correct values. Again, probably the delegated methods determine this but this is a bit C# IEnumerable Nerelerde Kullanılıyor more than I know about IEnumerable.

Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead

This way you have possibility to do many things with that query without touching the data (in this case C# IEnumerable Temel Özellikleri data in the list). List method takes the prepared query and executes it against the source of data.

Where the execution will be performed out-of-process, the logic of the query başmaklık to be represented in data such that the LINQ provider birey convert it into the appropriate form for the out-of-memory execution - whether that's an LDAP query, SQL or whatever.

C# ile MySQL veritabanından bilgi listelemek için IEnumerable kullanarak dundaki örnek şifre kullanılabilir:

Bu alanda veya özge bir alanda, benim ve öteki yardımcı insanların paylaşımlarına lütfen acizliğiniz ve ezikliğinizle yaklaşmayınız. İzin istemek, benim hükmüm şeşna girmeniz mealına gelmemektedir.

There's also the issues of deferred execution and unmanaged resources. IEnumerable takes C# IEnumerable Nedir use of the yield syntax, which mean you go over each item by-itself and birey perform all kinds of computations before and after. And again, this happens one-by-one, so you don't 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 C# IEnumerable Temel Özellikleri 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 C# IEnumerable Kullanımı with all filters.

şayet ki siz “var” almak istiyorsanız GetEnumerator metodunun son dilküş tipini süflidaki üzere generic IEnumerator olarak teşhismlamanız gerekmektedir.