Please enable Javascript to correctly display the contents on Dot Net Tricks!

IEnumerable VS IQueryable

  Author : Shailendra Chauhan
Posted On : 16 Jun 2012
Total Views : 132,636   
Updated On : 28 Jan 2015
 

In LINQ to query data from database and collections, we use IEnumerable and IQueryable for data manipulation. IEnumerable is inherited by IQueryable, Hence IQueryable has all the features of IEnumerable and except this, it has its own features. Both have its own importance to query data and data manipulation. Let’s see both the fetures and take the advantage of both the fetures to boost your LINQ Query performance.

IEnumerable

  1. IEnumerable exists in System.Collections Namespace.

  2. IEnumerable can move forward only over a collection, it can’t move backward and between the items.

  3. IEnumerable is best to query data from in-memory collections like List, Array etc.

  4. While query data from database, IEnumerable execute select query on server side, load data in-memory on client side and then filter data.

  5. IEnumerable is suitable for LINQ to Object and LINQ to XML queries.

  6. IEnumerable supports deferred execution.

  7. IEnumerable doesn’t supports custom query.

  8. IEnumerable doesn’t support lazy loading. Hence not suitable for paging like scenarios.

  9. Extension methods supports by IEnumerable takes functional objects.

IEnumerable Example

 MyDataContext dc = new MyDataContext ();
IEnumerable<Employee> list = dc.Employees.Where(p => p.Name.StartsWith("S"));
list = list.Take<Employee>(10); 

Generated SQL statements of above query will be :

 SELECT [t0].[EmpID], [t0].[EmpName], [t0].[Salary] FROM [Employee] AS [t0]
WHERE [t0].[EmpName] LIKE @p0

Notice that in this query "top 10" is missing since IEnumerable filters records on client side

IQueryable

  1. IQueryable exists in System.Linq Namespace.

  2. IQueryable can move forward only over a collection, it can’t move backward and between the items.

  3. IQueryable is best to query data from out-memory (like remote database, service) collections.

  4. While query data from database, IQueryable execute select query on server side with all filters.

  5. IQueryable is suitable for LINQ to SQL queries.

  6. IQueryable supports deferred execution.

  7. IQueryable supports custom query using CreateQuery and Execute methods.

  8. IQueryable support lazy loading. Hence it is suitable for paging like scenarios.

  9. Extension methods supports by IQueryable takes expression objects means expression tree.

IQueryable Example

 MyDataContext dc = new MyDataContext ();
IQueryable<Employee> list = dc.Employees.Where(p => p.Name.StartsWith("S"));
list = list.Take<Employee>(10); 

Generated SQL statements of above query will be :

 SELECT TOP 10 [t0].[EmpID], [t0].[EmpName], [t0].[Salary] FROM [Employee] AS [t0]
WHERE [t0].[EmpName] LIKE @p0

Notice that in this query "top 10" is exist since IQueryable executes query in SQL server with all filters.

Summary

In this article I try to explain the difference between IEnumerable and IQueryable. I hope after reading this article you will be able to boost your LINQ query performance. I would like to have feedback from my blog readers. Please post your feedback, question, or comments about this article.



Free Interview Books
 
COMMENTS (0)
6 MAR
Master Class Fast Track MVC 5 with Angular2 Development (Online)

10:30 AM -03:30 PM IST (Fast Track)

Know More
6 MAR
Angular 2 Master Class Fast Track Online Development Training (Online)

10:30 AM- 01:30 PM IST

Know More
27 FEB
ASP.NET MVC with Angular2 Development (Online)

07:00 AM - 09:00 AM IST( MON, WED, FRI)

Know More
19 FEB
Xamarin Forms : Build Cross-platform Apps (Classroom)

3:00 PM-4:30 PM IST

18 FEB
ASP.NET MVC with Angular2 Development (Classroom)

05:00 PM-06:30 PM

14 FEB
.NET Development (Classroom)

11:00 AM-12:00 PM

31 JAN
ASP.NET MVC with Angular2 Development (Online)

07:00 AM-09:00 AM IST(Tuesday & Thursday)

30 JAN
NODEJS & MEAN Stack 2.x Development (Online)

09:00 PM-11:00 PM IST( MON, WED, FRI)

15 JAN
PPC Marketing (Classroom)

04:00 PM-05:30 PM

10 JAN
ASP.NET MVC with AngularJS Development (Online)

09:00 PM-11:00 PM IST on (TUE, THRU,SAT)

31 DEC
ASP.NET MVC with AngularJS Development (Classroom)

09:30 AM-11:00 AM

5 NOV
ASP.NET MVC with AngularJS Development (Classroom)

08:00 AM-09:30 AM

BROWSE BY CATEGORY
 
 
LIKE US ON FACEBOOK
 

Professional Speaks

+