How to use dependency injection in web api controller class for dbset objects
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1
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I am use DI in my controller class as documented here. The object I am passing with DI has to be used as dbset.
public class ValuesController : ControllerBase
{
private readonly RPContext _context;
private IResource _resource;
public ValuesController(RPContext context, IResource resource)
{
_context = context;
_resource = resource;
}
[HttpPost("{id}/{resourceName}")]
public void Post([FromRoute] string id, [FromRoute] string resourceName, [FromBody] JObject Request)
{
_resource.Id = id;
_resource.Name = resourceName;
_resource.Location = (string)Request["location"];
_context.Resources.Add(_resource);
_context.SaveChangesAsync();
}
I cannot use "_resource" in the above code with the Add method of Dbcontext object because it is an interface and not of class type. How else should I be doing this if I don't want to create new objects in my controller class?
entity-framework asp.net-core dependency-injection entity-framework-core
asked Nov 10 at 5:03
user1097128
289
add a comment |
up vote
1
down vote
favorite
I am use DI in my controller class as documented here. The object I am passing with DI has to be used as dbset.
public class ValuesController : ControllerBase
{
private readonly RPContext _context;
private IResource _resource;
public ValuesController(RPContext context, IResource resource)
{
_context = context;
_resource = resource;
}
[HttpPost("{id}/{resourceName}")]
public void Post([FromRoute] string id, [FromRoute] string resourceName, [FromBody] JObject Request)
{
_resource.Id = id;
_resource.Name = resourceName;
_resource.Location = (string)Request["location"];
_context.Resources.Add(_resource);
_context.SaveChangesAsync();
}
I cannot use "_resource" in the above code with the Add method of Dbcontext object because it is an interface and not of class type. How else should I be doing this if I don't want to create new objects in my controller class?
entity-framework asp.net-core dependency-injection entity-framework-core
asked Nov 10 at 5:03
user1097128
289
This question contains a LOT of things:1.The controller inherit toControllerBaseinstead ofController.2.Using asynchronous task but returningvoid.3.Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).
– Foo
Nov 10 at 7:34
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits fromController, not justControllerBase(I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits fromController.
– Foo
Nov 10 at 14:45
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I am use DI in my controller class as documented here. The object I am passing with DI has to be used as dbset.
public class ValuesController : ControllerBase
{
private readonly RPContext _context;
private IResource _resource;
public ValuesController(RPContext context, IResource resource)
{
_context = context;
_resource = resource;
}
[HttpPost("{id}/{resourceName}")]
public void Post([FromRoute] string id, [FromRoute] string resourceName, [FromBody] JObject Request)
{
_resource.Id = id;
_resource.Name = resourceName;
_resource.Location = (string)Request["location"];
_context.Resources.Add(_resource);
_context.SaveChangesAsync();
}
I cannot use "_resource" in the above code with the Add method of Dbcontext object because it is an interface and not of class type. How else should I be doing this if I don't want to create new objects in my controller class?
entity-framework asp.net-core dependency-injection entity-framework-core
asked Nov 10 at 5:03
user1097128
289
I am use DI in my controller class as documented here. The object I am passing with DI has to be used as dbset.
public class ValuesController : ControllerBase
{
private readonly RPContext _context;
private IResource _resource;
public ValuesController(RPContext context, IResource resource)
{
_context = context;
_resource = resource;
}
[HttpPost("{id}/{resourceName}")]
public void Post([FromRoute] string id, [FromRoute] string resourceName, [FromBody] JObject Request)
{
_resource.Id = id;
_resource.Name = resourceName;
_resource.Location = (string)Request["location"];
_context.Resources.Add(_resource);
_context.SaveChangesAsync();
}
I cannot use "_resource" in the above code with the Add method of Dbcontext object because it is an interface and not of class type. How else should I be doing this if I don't want to create new objects in my controller class?
entity-framework asp.net-core dependency-injection entity-framework-core
entity-framework asp.net-core dependency-injection entity-framework-core
asked Nov 10 at 5:03
user1097128
289
asked Nov 10 at 5:03
user1097128
289
edited Nov 10 at 9:48
asked Nov 10 at 5:03
user1097128
289
asked Nov 10 at 5:03
user1097128
289
asked Nov 10 at 5:03
user1097128
289
289
This question contains a LOT of things:1.The controller inherit toControllerBaseinstead ofController.2.Using asynchronous task but returningvoid.3.Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).
– Foo
Nov 10 at 7:34
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits fromController, not justControllerBase(I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits fromController.
– Foo
Nov 10 at 14:45
add a comment |
This question contains a LOT of things:1.The controller inherit toControllerBaseinstead ofController.2.Using asynchronous task but returningvoid.3.Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).
– Foo
Nov 10 at 7:34
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits fromController, not justControllerBase(I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits fromController.
– Foo
Nov 10 at 14:45
This question contains a LOT of things:
1. The controller inherit to ControllerBase instead of Controller. 2. Using asynchronous task but returning void. 3. Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).– Foo
Nov 10 at 7:34
This question contains a LOT of things:
1. The controller inherit to ControllerBase instead of Controller. 2. Using asynchronous task but returning void. 3. Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).– Foo
Nov 10 at 7:34
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits from
Controller, not just ControllerBase (I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits from Controller.– Foo
Nov 10 at 14:45
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits from
Controller, not just ControllerBase (I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits from Controller.– Foo
Nov 10 at 14:45
add a comment |
1 Answer
1
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up vote
1
down vote
Please note that IResource is the interface of a service, not an object itself. So IResource isn't a new object. If you need a new object you can take a factory approach:
var resource = _resource.Create();
To add an entity to the context:
[HttpPost("{resourceName}")]
public async Task<IActionResult> Post([FromRoute]string resourceName, [FromBody]JObject Request)
{
var resource = new Data.Entities.Resource
{
Name = resourceName,
Location = (string)Request["location"]
};
_context.Resources.Add(resource);
_context.SaveChangesAsync();
return CreatedAtRoute("Get", new { id = resource.Id }, resource.Id);
}
Where the result links to the created object.
I noticed that you've included an Id for this request. But it seems that a new resource is created, so I've omitted the Id because it is probably set in the database.
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
add a comment |
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1 Answer
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1 Answer
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active
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up vote
1
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Please note that IResource is the interface of a service, not an object itself. So IResource isn't a new object. If you need a new object you can take a factory approach:
var resource = _resource.Create();
To add an entity to the context:
[HttpPost("{resourceName}")]
public async Task<IActionResult> Post([FromRoute]string resourceName, [FromBody]JObject Request)
{
var resource = new Data.Entities.Resource
{
Name = resourceName,
Location = (string)Request["location"]
};
_context.Resources.Add(resource);
_context.SaveChangesAsync();
return CreatedAtRoute("Get", new { id = resource.Id }, resource.Id);
}
Where the result links to the created object.
I noticed that you've included an Id for this request. But it seems that a new resource is created, so I've omitted the Id because it is probably set in the database.
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
add a comment |
up vote
1
down vote
Please note that IResource is the interface of a service, not an object itself. So IResource isn't a new object. If you need a new object you can take a factory approach:
var resource = _resource.Create();
To add an entity to the context:
[HttpPost("{resourceName}")]
public async Task<IActionResult> Post([FromRoute]string resourceName, [FromBody]JObject Request)
{
var resource = new Data.Entities.Resource
{
Name = resourceName,
Location = (string)Request["location"]
};
_context.Resources.Add(resource);
_context.SaveChangesAsync();
return CreatedAtRoute("Get", new { id = resource.Id }, resource.Id);
}
Where the result links to the created object.
I noticed that you've included an Id for this request. But it seems that a new resource is created, so I've omitted the Id because it is probably set in the database.
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
add a comment |
up vote
1
down vote
up vote
1
down vote
Please note that IResource is the interface of a service, not an object itself. So IResource isn't a new object. If you need a new object you can take a factory approach:
var resource = _resource.Create();
To add an entity to the context:
[HttpPost("{resourceName}")]
public async Task<IActionResult> Post([FromRoute]string resourceName, [FromBody]JObject Request)
{
var resource = new Data.Entities.Resource
{
Name = resourceName,
Location = (string)Request["location"]
};
_context.Resources.Add(resource);
_context.SaveChangesAsync();
return CreatedAtRoute("Get", new { id = resource.Id }, resource.Id);
}
Where the result links to the created object.
I noticed that you've included an Id for this request. But it seems that a new resource is created, so I've omitted the Id because it is probably set in the database.
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
Please note that IResource is the interface of a service, not an object itself. So IResource isn't a new object. If you need a new object you can take a factory approach:
var resource = _resource.Create();
To add an entity to the context:
[HttpPost("{resourceName}")]
public async Task<IActionResult> Post([FromRoute]string resourceName, [FromBody]JObject Request)
{
var resource = new Data.Entities.Resource
{
Name = resourceName,
Location = (string)Request["location"]
};
_context.Resources.Add(resource);
_context.SaveChangesAsync();
return CreatedAtRoute("Get", new { id = resource.Id }, resource.Id);
}
Where the result links to the created object.
I noticed that you've included an Id for this request. But it seems that a new resource is created, so I've omitted the Id because it is probably set in the database.
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
answered Nov 10 at 14:25
Ruard van Elburg
5,09321125
5,09321125
add a comment |
add a comment |
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This question contains a LOT of things:
1.The controller inherit toControllerBaseinstead ofController.2.Using asynchronous task but returningvoid.3.Try to cast an interface to a class... I suggest you to read the documentation careful and follow step-by-step to understand how it works. Or just download the project and run (via the link you provide).– Foo
Nov 10 at 7:34
async was a copy-paste mistake made while adding code here from older version, removed it. When you create web api project through Visual Studio, it only inerits from controllerbase. Seems like Controller is for MVC views and models which I don't need.
– user1097128
Nov 10 at 9:53
@TânNguyễn About ControllerBase: docs.microsoft.com/nl-nl/aspnet/core/web-api/…
– Ruard van Elburg
Nov 10 at 14:04
@RuardvanElburg Indeed, we can use almost everything in Web API with a class that inherits from
Controller, not justControllerBase(I'm sure). And the question about the difference(s) may be in another post. I said that because: when I create new controller in my project (.net core 2.1), it inherits fromController.– Foo
Nov 10 at 14:45