@OlivierJacot-Descombes: Short of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index.
are two properties in particular—one that points to a query provider (e.g., a LINQ to SQL provider) and another one pointing to a query expression representing the IQueryable object birli a runtime-traversable abstract syntax tree that can be understood by the given query provider (for the most part, you dirilik't give a LINQ to SQL expression to a LINQ to Entities provider without an exception being thrown).
So unless you want to perform operations that are more efficient on the list, this really does mean lower performance.
For example, if you do derece need to access items by index, but constantly insert items at the beginning of your collection and then remove items from the end, a Queue would be far more appropriate to use.
(as per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you can't really do - for example, it is hoped
B. IEnumerator can remember the current index when we pass from one method to another (it start working with current index) but IEnumerable gönül't remember the index and it reset the index to beginning. More in this video
So if I am going through C# IEnumerable Nasıl Kullanılır all the items on ebay, one at a time would be something even a small computer emanet handle, but ".ToList()" would surely run me out of memory, no matter how big my computer was. No computer sevimli by itself contain and C# IEnumerable Temel Özellikleri handle such a huge amount of veri.
Yani uzun sözün kısası IEnumerable interface’in implement edildiği bir class üzerine GetEnumerator metodu uygulattırılır. Haliyle fevkda yaptığımız kabil müntesip metodu manuel olarak yazmaktan ve C# IEnumerable Nasıl Kullanılır olası doldurulma hatalarından bizleri kurtarmaktadır.
The major difference between IQueryable and IEnumerable is that IQueryable executes query with filters whereas IEnumerable C# IEnumerable Temel Özellikleri executes the query first and then it filters the data based on conditions.
Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 1 The mistake with "Reset" was with just having one type of enumerable. IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and C# IEnumerable Nasıl Kullanılır guarantee that multiple passes will either return identical veri or throw an exception; an ordinary IEnumerable whose collection was modified should be allowed to return 'sensible' data if it's able to do so or throw an exception if it sevimli't, and an ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.
This takes an IEnumerator factory function, which usually hayat be provided very easily instead of the single IEnumerator instance (which yields wrong results after first iteration and breaks the semantics of IEnumerable). This avoids the issues marked by Marc Gravell and establishes full IEnumerable behavior.
Generally, don't worry about what's actually in the IEnumerables, kakım it will be completely different from your actual code. Only worry about the actual output when you iterate over it :)
If you create an IEnumerable, then all rows will be pulled into memory kakım objects before running the query.
Projeyi yayınladıgınız dem user secrets kullanılmıyor. Bu yalnızca ihya aşamasında kullanılabilir.