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Advantage of using IActionResult as result type in Actions

What is the difference between returning a model vs ActionResult<Model> in an API controller?How to write custom actionResult in asp.net coreasync Task<IActionResult> vs Task<T>What should be returned from the Get request in the web API?@Html.EditorFor doesn't return specific types to the controllerMVC 6 - ViewModel Builder ConceptHandle IActionResult in MVC6Why won't my ASP.Net Core Web API Controller return XML?How to return a custom HTTP status/message in ASP.NET Core without returning object, IActionResult, etc?Unit testing controller methods which return IActionResultHow to return a StatusCode object outside of an MVC ControllerHow can I call a controller action when rendering a partial view?.Net Core WebAPI connection reset, when I have “include” in my controllersimple controller index action says “value”

19

3

What's the advantage or recommendation on using IActionResult as the return type of a WebApi controller instead of the actual type you want to return?

Most of the examples I've seen return IActionResult, but when I build my first site I exclusively use View Model classes as my return types.... now I feel like I did it all wrong!

asp.net-core asp.net-core-mvc

share|improve this question

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

add a comment | 

19

3

What's the advantage or recommendation on using IActionResult as the return type of a WebApi controller instead of the actual type you want to return?

Most of the examples I've seen return IActionResult, but when I build my first site I exclusively use View Model classes as my return types.... now I feel like I did it all wrong!

asp.net-core asp.net-core-mvc

share|improve this question

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

add a comment | 

What's the advantage or recommendation on using IActionResult as the return type of a WebApi controller instead of the actual type you want to return?

Most of the examples I've seen return IActionResult, but when I build my first site I exclusively use View Model classes as my return types.... now I feel like I did it all wrong!

asp.net-core asp.net-core-mvc

share|improve this question

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

share|improve this question

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

share|improve this question

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

edited Jun 23 '16 at 18:09

Tseng

35.4k595127

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

asked Jun 23 '16 at 17:34

Zeus82Zeus82

2,08932554

2 Answers
2

active

oldest

votes

16

The main advantage is that you can return error/status codes or redirects/resource urls.

For example:

public IActionResult Get(integer id) 

 var user = db.Users.Where(u => u.UserId = id).FirstOrDefault();

 if(user == null) 
 
 // Returns HttpCode 404
 return NotFound();
 

 // returns HttpCode 200
 return ObjectOk(user);

or

public IActionResult Create(User user) 

 if(!ModelState.IsValid) 
 
 // returns HttpCode 400
 return BadRequest(ModelState);
 

 db.Users.Add(user);
 db.SaveChanges();

 // returns HttpCode 201
 return CreatedAtActionResult("User", "Get", new id = user.Id );

share|improve this answer

edited Jun 27 '16 at 6:40

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Also unit testing
  
  – Kiran Challa
  Jun 23 '16 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @KiranChalla I don't understand what we get with IActionResult which we can't get with ActionResult, is ActionResult limit us in some way? The other answers on the internet is not that compelling.
  
  – Hamid Mosalla
  Mar 25 '17 at 18:34
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @HamidMosalla; Technically not much, but IActionResult is an interface and ActionResult an abstract class. While all ActionResults from MVC inherit from ActionResult, it is not given or guaranteed, that some 3rd party action result classes do the same, so it's always best to use the lowest possible type, here: IActionResult
  
  – Tseng
  Mar 25 '17 at 20:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I know IActionResult' is an interface and doesn't have the synchronous version of ExecuteResult` method as opposed to ActionResult, I didn't find anything different from a consumer perspective, I think it might be a more of a framework design decision in which we consumer of that framework should not care about that much.
  
  – Hamid Mosalla
  Mar 26 '17 at 2:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I am late to the party, but you can also return BadRequest and CreatedAtActionResult with IActionResult, which makes it seem like there are no advantages with IActionResult then according to your examples.
  
  – thesystem
  Dec 22 '18 at 16:41
  

  
  
  
  

 | 
show 2 more comments

1

The main advantage is that you can easily test your code using a mocking framework.

And as you build your controllers, you can easily change your return object as well. IActionResult is a interface and has many implementations like JsonResult, ViewResult, FileResult and so on.

share|improve this answer

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

add a comment | 

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16

The main advantage is that you can return error/status codes or redirects/resource urls.

For example:

public IActionResult Get(integer id) 

 var user = db.Users.Where(u => u.UserId = id).FirstOrDefault();

 if(user == null) 
 
 // Returns HttpCode 404
 return NotFound();
 

 // returns HttpCode 200
 return ObjectOk(user);

or

public IActionResult Create(User user) 

 if(!ModelState.IsValid) 
 
 // returns HttpCode 400
 return BadRequest(ModelState);
 

 db.Users.Add(user);
 db.SaveChanges();

 // returns HttpCode 201
 return CreatedAtActionResult("User", "Get", new id = user.Id );

share|improve this answer

edited Jun 27 '16 at 6:40

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Also unit testing
  
  – Kiran Challa
  Jun 23 '16 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @KiranChalla I don't understand what we get with IActionResult which we can't get with ActionResult, is ActionResult limit us in some way? The other answers on the internet is not that compelling.
  
  – Hamid Mosalla
  Mar 25 '17 at 18:34
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @HamidMosalla; Technically not much, but IActionResult is an interface and ActionResult an abstract class. While all ActionResults from MVC inherit from ActionResult, it is not given or guaranteed, that some 3rd party action result classes do the same, so it's always best to use the lowest possible type, here: IActionResult
  
  – Tseng
  Mar 25 '17 at 20:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I know IActionResult' is an interface and doesn't have the synchronous version of ExecuteResult` method as opposed to ActionResult, I didn't find anything different from a consumer perspective, I think it might be a more of a framework design decision in which we consumer of that framework should not care about that much.
  
  – Hamid Mosalla
  Mar 26 '17 at 2:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I am late to the party, but you can also return BadRequest and CreatedAtActionResult with IActionResult, which makes it seem like there are no advantages with IActionResult then according to your examples.
  
  – thesystem
  Dec 22 '18 at 16:41
  

  
  
  
  

 | 
show 2 more comments

16

The main advantage is that you can return error/status codes or redirects/resource urls.

For example:

public IActionResult Get(integer id) 

 var user = db.Users.Where(u => u.UserId = id).FirstOrDefault();

 if(user == null) 
 
 // Returns HttpCode 404
 return NotFound();
 

 // returns HttpCode 200
 return ObjectOk(user);

or

public IActionResult Create(User user) 

 if(!ModelState.IsValid) 
 
 // returns HttpCode 400
 return BadRequest(ModelState);
 

 db.Users.Add(user);
 db.SaveChanges();

 // returns HttpCode 201
 return CreatedAtActionResult("User", "Get", new id = user.Id );

share|improve this answer

edited Jun 27 '16 at 6:40

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Also unit testing
  
  – Kiran Challa
  Jun 23 '16 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @KiranChalla I don't understand what we get with IActionResult which we can't get with ActionResult, is ActionResult limit us in some way? The other answers on the internet is not that compelling.
  
  – Hamid Mosalla
  Mar 25 '17 at 18:34
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @HamidMosalla; Technically not much, but IActionResult is an interface and ActionResult an abstract class. While all ActionResults from MVC inherit from ActionResult, it is not given or guaranteed, that some 3rd party action result classes do the same, so it's always best to use the lowest possible type, here: IActionResult
  
  – Tseng
  Mar 25 '17 at 20:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I know IActionResult' is an interface and doesn't have the synchronous version of ExecuteResult` method as opposed to ActionResult, I didn't find anything different from a consumer perspective, I think it might be a more of a framework design decision in which we consumer of that framework should not care about that much.
  
  – Hamid Mosalla
  Mar 26 '17 at 2:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Tseng I am late to the party, but you can also return BadRequest and CreatedAtActionResult with IActionResult, which makes it seem like there are no advantages with IActionResult then according to your examples.
  
  – thesystem
  Dec 22 '18 at 16:41
  

  
  
  
  

 | 
show 2 more comments

The main advantage is that you can return error/status codes or redirects/resource urls.

For example:

public IActionResult Get(integer id) 

 var user = db.Users.Where(u => u.UserId = id).FirstOrDefault();

 if(user == null) 
 
 // Returns HttpCode 404
 return NotFound();
 

 // returns HttpCode 200
 return ObjectOk(user);

or

public IActionResult Create(User user) 

 if(!ModelState.IsValid) 
 
 // returns HttpCode 400
 return BadRequest(ModelState);
 

 db.Users.Add(user);
 db.SaveChanges();

 // returns HttpCode 201
 return CreatedAtActionResult("User", "Get", new id = user.Id );

share|improve this answer

edited Jun 27 '16 at 6:40

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

public IActionResult Get(integer id) 

 var user = db.Users.Where(u => u.UserId = id).FirstOrDefault();

 if(user == null) 
 
 // Returns HttpCode 404
 return NotFound();
 

 // returns HttpCode 200
 return ObjectOk(user);

public IActionResult Create(User user) 

 if(!ModelState.IsValid) 
 
 // returns HttpCode 400
 return BadRequest(ModelState);
 

 db.Users.Add(user);
 db.SaveChanges();

 // returns HttpCode 201
 return CreatedAtActionResult("User", "Get", new id = user.Id );

share|improve this answer

edited Jun 27 '16 at 6:40

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

answered Jun 23 '16 at 18:06

TsengTseng

35.4k595127

1

The main advantage is that you can easily test your code using a mocking framework.

And as you build your controllers, you can easily change your return object as well. IActionResult is a interface and has many implementations like JsonResult, ViewResult, FileResult and so on.

share|improve this answer

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

add a comment | 

1

The main advantage is that you can easily test your code using a mocking framework.

And as you build your controllers, you can easily change your return object as well. IActionResult is a interface and has many implementations like JsonResult, ViewResult, FileResult and so on.

share|improve this answer

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

add a comment | 

The main advantage is that you can easily test your code using a mocking framework.

And as you build your controllers, you can easily change your return object as well. IActionResult is a interface and has many implementations like JsonResult, ViewResult, FileResult and so on.

share|improve this answer

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

share|improve this answer

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966

answered Jun 23 '16 at 18:21

gnllucenagnllucena

60966