what is ienumerable and iqueryable in c

by Mrs. Kristin Ritchie Published 3 years ago Updated 2 years ago

What is the difference between IEnumerable and IQueryable in C#?

IEnumerable exists in System.Collections Namespace.
IQueryable exists in System. ...
Both IEnumerable and IQueryable are forward collection.
IEnumerable doesn’t support lazy loading
IQueryable support lazy loading
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.

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.

Full Answer

What is the difference between IList and IEnumerable?

Jun 22, 2020 · Iqueryable is an interface used to iterate through collections. It inherits the IEnumerable interface & can be found in System.Linq namespace. There is a key difference between IQueryable & IEnumerable, IEnumerable fetches all the data from SQLServer then it applies filters over fetched data. Let's break-down its flow from the client to the server.

When to use IEnumerable or icollection or IList or list?

The IQuerable interface is a child of the IEnumerable interface. So we can store IQuerable in a variable of type IEnumerable. The IQuerable interface has a property called Provider which is of type IQueryProvider interface. Let us see the definition of IQueryProvider. The methods provided by the IQueryProvider are used to create all Linq Providers.

When to use IQueryable?

Sep 05, 2014 · A C-Sharp developer is always puzzled about usage of the following interfaces: IEnumerable; IQueryable; ICollection; IList; I see developers are not that confident about usage of the mentioned ...

How to convert IEnumerable to iobservable?

The IEnumerable is mostly used for LINQ to Object and LINQ to XML queries. The IEnumerable collection is of type forward only. That means it can only move in forward, it can’t move backward and between the items. IEnumerable supports deferred execution. It doesn’t support custom queries. The IEnumerable doesn’t support lazy loading. Hence, it is not suitable for paging like …

What is IQueryable and IEnumerable?

The principle difference is that IEnumerable will enumerate all of its elements all the time, while IQueryable will enumerate elements, or even do other things, based on a query. The query is an Expression (a data representation of .

What is an IQueryable?

The IQueryable interface allows you to define parts of a query against a remote LINQ provider (typically against a database, but doesn't have to be) in multiple steps, and with deferred execution.Apr 20, 2010

Should I use IQueryable or IEnumerable?

IEnumerable: IEnumerable is best suitable for working with in-memory collection (or local queries). IEnumerable doesn't move between items, it is forward only collection. IQueryable: IQueryable best suits for remote data source, like a database or web service (or remote queries).

Why do we use IQueryable?

IQueryable is suitable for querying data from out-memory (like remote database, service) collections. While querying data from a database, IQueryable executes a "select query" on server-side with all filters. IQueryable is beneficial for LINQ to SQL queries.Apr 7, 2019

Which is faster IEnumerable or IQueryable?

IQueryable is faster than IEnumerable. In addition to Munesh Sharma's answer:IEnumerable loads data in-memory and then apply filters to it one by one but IQueryable apply filters all at once and return the result.Jul 9, 2014

What is difference between IQueryable and list in C#?

List is just an output format, and while it implements IEnumerable , is not directly related to querying. In other words, when you're using IQueryable , you're defining an expression that gets translated into something else.

What is IQueryable in C# with example?

The IQueryable interface inherits the IEnumerable interface so that if it represents a query, the results of that query can be enumerated. Enumeration causes the expression tree associated with an IQueryable object to be executed. The definition of "executing an expression tree" is specific to a query provider.

What is the difference between returning IQueryable vs IEnumerable?

While querying data from database, IEnumerable executes select query on server side, load data in-memory on client side and then filter data. Hence does more work and becomes slow. While querying data from database, IQueryable executes select query on server side with all filters. Hence does less work and becomes fast.Feb 24, 2014

Where return IEnumerable instead of IQueryable?

In general terms I would recommend the following: Return IQueryable if you want to enable the developer using your method to refine the query you return before executing. Return IEnumerable if you want to transport a set of Objects to enumerate over.

What is IEnumerable?

IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. It is the base interface for all non-generic collections that can be enumerated. This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement.Aug 9, 2018

Why we use IEnumerable in LINQ?

The IEnumerable is mostly used for LINQ to Object and LINQ to XML queries. The IEnumerable collection is of type forward only. That means it can only move in forward, it can't move backward and between the items. IEnumerable supports deferred execution.

What is IEnumerable in C# Geeksforgeeks?

What is IEnumerable in C#? IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.Oct 29, 2021

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