What is the difference between IQueryable IEnumerable IList ICollection?

IList is everything that ICollection is, but it also supports adding and removing items, retrieving items by index, etc. It’s the most commonly-used interface for “lists of objects”, which is vague I know. IQueryable is an enumerable interface that supports LINQ.

Is IQueryable faster than List?

GetList(context) might return an object backed by a custom LINQ provider (like an Entity Framework collection), then you probably want to leave the data cast as an IQueryable: even though your benchmark shows it being 20 times faster to use a list, that difference is so small that no user is ever going to be able to …

What is the difference between returning IQueryable T vs IEnumerable T >?

Querying data from a database, IEnumerable execute a select query on the server side, load data in-memory on a client-side and then filter data. Querying data from a database, IQueryable execute the select query on the server side with all filters. IEnumerable Extension methods take functional objects.

What’s the difference between IQueryable, IEnumerable and IList?

IQueryable is useful when we want to iterate a collection of objects which deals with ad-hoc queries against the data source or remote database, like SQL Server. IList is useful when we want to perform any operation like Add, Remove or Get item at specific index position in the collection.

Which is better IEnumerable or IList in dot net?

Like IEnumerable, IList is also best to query data from in-memory collections like List, Array etc. IList is useful when you want to Add or remove items from the list. IList can find out the no of elements in the collection without iterating the collection. IList supports deferred execution. IList doesn’t support further filtering.

When to use the IList interface in LINQ?

The IList interface is useful when you want to perform any operation like get item, add a new item, or remove an item at a specific index from the collection.

Is there a proper way to implement IQueryable?

IQueryable is a cheat: IQueryable is nearly impossible to implement. And currently there is no proper solution. Even Entity Framework has lots of UnsupportedExceptions. Today Queryable providers have large dependance on infrastructure. Sharepoint has its own partial implementation and My SQL provider has distinct partial implementation.