En iyi Tarafı C# IEnumerable Temel Özellikleri

En iyi Tarafı C# IEnumerable Temel Özellikleri

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@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.

Bu dü arayüzün tasarruf senaryoları farklıdır ve birbirlerinin yerine kullanılmamalıdır. Bu makalede, IEnumerable ve IQueryable arasındaki farkları inceleyeceğiz.

An IEnumerable is a thing that güç be enumerated...which simply means that it özgü a GetEnumerator method that returns an IEnumerator.

Consider that in your code example a new list created. I don't know what is m_states, but if this is a value types collection, you create a clone of the original list. In this way the returning list sevimli be manipulated form the caller Add/Remove/Update elements. without

Although there are uses of IEnumerable other than "foreach", the alışılagelen indication that one should implement IEnumerable is that the class is one where it would make sense to say "foreach foo in classItem foo.do_something(); .

Short story about a gestalt living on a fake tropical island / paradise planet, who was actually an adult CEO but didn't remember it

The "inner" member does derece have "Animal" instances in it, but rather "Species" instances, which was very strange for me. The "outer" member does contain "Animal" instances. I presume that the two delegates determine which goes in and what goes out of it?

You don't have to open a book and learn how to traverse the tree - but simply use the foreach statement on C# IStructuralComparable Temel Özellikleri that object and you're done.)

The major difference between IQueryable and IEnumerable is that IQueryable executes query with filters whereas IEnumerable executes the query first and then it filters the data based on conditions.

Kısaca IEnumerable örgüsında filtreleme aksiyonlemleri memory de binalırken, IQueryable da veritabanından direk filtrelenmiş verileri elde ederiz.

And that might be useful and more efficient in certain cases. C# IStructuralComparable Temel Özellikleri For example, your class might derece hold any collection in memory, but rather iterate over all C# IStructuralComparable Temel Özellikleri files existing in a certain directory, or items in certain DB, or other unmanaged resources. IEnumerable birey step in and do it for you (you C# IStructuralComparable Nasıl kullanılır could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives you the benefit of being able to use the object produced in a foreach loop).

Consider the below simple code which uses IEnumerable with entity framework. It’s using a Where filter to get records whose EmpId is 2.

IQueryable is a very powerful feature that enables a variety of interesting deferred execution scenarios (like paging and composition based queries).

In addition to all the answers posted above, here is my two C# IStructuralComparable Nasıl kullanılır cents. There are many other types other than List that implements IEnumerable such ICollection, ArrayList etc.