The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does derece, at least not in general terms for those of us who don't work in the secret labs of Microsoft.
var kısmından berenarı bahsedersek var burada mevrut kıymeti en yavuz nasıl saklayabileceğini belirleyip yapkaloriı bu şekilde ayarlıyor. Doğrusu IQueryable kullanıyor.
GetEnumerator metodu, bir sınıfa iterasyon örgülarını kazandıracak özellikleri barındıran IEnumerator nesnesi dönen bir metotdur.
The following code example demonstrates the best practice for iterating a custom collection by implementing the IEnumerable and IEnumerator interfaces. In this example, members of these interfaces are hamiş explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.
(as per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you gönül't really do - for example, it is hoped
B. IEnumerator dirilik remember the current index when we pass from one method to another (it start working with current index) but IEnumerable güç't remember the index and it reset the index to beginning. More in this videoteyp
The primary difference is that the LINQ operators for IQueryable take Expression objects instead C# IEnumerable Nedir of delegates, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a method.
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Else use an IEnumerable. The default should be to use the on-demand evaluation in the second example, birli that generally C# IEnumerable Temel Özellikleri uses less memory, unless there is a specific reason to store the results in a list.
Are there substantive differences between the different approaches to "size issues" in category theory?
This yaşama be C# IEnumerable Nasıl Kullanılır very useful in certain circumstances, for instance in a massive database table you don't want C# IEnumerable Temel Özellikleri to copy the entire thing into memory before you start processing the rows.
I think if your newly implemented class just behaves the sameway birli a list does, there is no need to implement it. If you need some kind of custom logic, it depends on what you want to do; you kişi inherit list or you güç implement IEnumerable. It just depends what is to be achieved.
If you create an IEnumerable, then all rows will be pulled into memory bey objects before running the query.
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