Web api :format api/controller?parameter= not working

prasanna p

6y2.9kLearn iOS Programming

Hi friends

when I am trying with this format api not working.

Web Api development(.net core 2.MVC)

api/controller?parameter=

where as when I am giving / in place of question mark it is giving the json result.

api/controller/parameter=

please help me to fix the above issue.

Thanks in advance.

20 Replies

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prasanna p6y ago
hi Friends,

Actual mistake is I don't use api/Control name is not placed in other controller. So the route conflict was occured and imapcted to this api.http://localhost:12401/api/Entity?keyword=A after placing route format everything is working fine.

Thank you all.
Jenith Thakkar6y ago
Set the break point and cthen hit the url from postman with this url

http://localhost:12401/api/Entity?keyword=A

and with this code

public async Task Get([FromUri] string keyword = "")

what you get in string keyword
Ramachandran M6y ago
Hi Prasanna,

API calls properly. It also responds. might be API authentication is failed from your back end. Add log on your web service and check. From the application side
prasanna p6y ago
Yes Ramachandran,

http://localhost:12401/api/Entity?keyword=A

getting empty result

{
    "responseCode": 200,
    "status": null,
    "message": "Records Not found",
    "admsg": null,
    "list": []
}
Ramachandran M6y ago
HI,

Can you try

[HttpGet]
        public HttpResponseMessage Get([FromUri] string id)
        {

prasanna p6y ago

hi,

Actual my problem is I don't want to change api why because lot dependecies are there in ios and android.So I need to continue with this api only.

http://localhost:1201/api/Entity?keyword= --for optional

http://localhost:1201/api/Entity?keyword=A --for keyword search

I tried with

 [Route("api/GetBooksByLocale/{lcid:int?}")]
  public HttpResponseMessage> GetBooksByLocale(int lcid = 1033)

but in my case it is a string field.But the above method call syntax is not there to string,where as other datatypes are there.

Is there any other way to resolve the issue with the same api?

how to get that with questionmark call after controller name like this


http://localhost:1201/api/Entity?keyword=       --for optional

Ramachandran M6y ago

Hi prashanna,

Can you try

  [Route("api/GetBooksByLocale/{lcid:int?}")]
    public HttpResponseMessage> GetBooksByLocale(int lcid = 1033)

prasanna p6y ago
Hi Jenith,

I changed the line with Fromuri the result is showing in the postman when the url is
http://localhost:12401/api/Entity/keyword=

but I need exact route url i.e:
http://localhost:12401/api/Entity?keyword= --for optional

http://localhost:12401/api/Entity?keyword=A --for keyword search

Please help to acheive with exact route url.
Jenith Thakkar6y ago
Convert this line
public async Task Get( string keyword = "")
to this
public async Task Get([FromUri] string keyword = "")

use [FromUri]
prasanna p6y ago
Hi Jaimin Shethiya,

I tried with your code.Api is not working with the question mark in the route.

there are any possible ways to fix the issue.
Jaimin Shethiya6y ago
Hello,

can you please try to below code.

http://localhost:1041/api/Entity/Get?keyword=A

And also check the below line if not added then please added.

[Route("api/[controller]")]
public class EntityController : ApiController

Thanks
prasanna p6y ago
Our code is like this :

namespace Api.Controllers
{
    //[Authorize]
    public class EntityController : ApiController
    {
   [HttpGet]
public async Task Get(string keyword = "")
        {
            try
            {

                Dictionary parms = new Dictionary();
                parms.Add("@keyword", string.IsNullOrEmpty(keyword)?DBNull.Value:(object)keyword);

                Experiment ent = new Experiment();
                ent.list = await _getEntityList.GetEntityList("SearchEntity", parms);
                if (ent.list.Count > 0)
                {
                    ent.responseCode = HttpStatusCode.OK;
                    ent.message = "Success";
                }
                else
                {
                    ent.responseCode = HttpStatusCode.NotFound;
                    ent.message = "Nothing found with this name";


                }
                var message = Request.CreateResponse(HttpStatusCode.OK, ent);
                return message;
            }
            catch (Exception ex)
            {
                var message = Request.CreateResponse(HttpStatusCode.BadRequest, ex.Message);
                return message;
            }
        }

    }

}
}
Ramachandran M6y ago
Hi Prasanna ,

As per my understanding based on controller base class it would work
like

public class TestController : ControllerBase

we will use http://localhost:1041/api/Entity/keyword=A

public class TestController : ApiController

We will use http://localhost:1041/api/Entity?keyword=A
Jenith Thakkar6y ago
Okay if possible then please provide your controller file
prasanna p6y ago
Hi Jenith,

I tried with HttpGet

what my problem is when I place / after controller it is showing result

http://localhost:1041/api/Entity/keyword=A

when I place question mark it is showing empty json result in the postman.
http://localhost:1041/api/Entity?keyword=A
Jenith Thakkar6y ago
Hi
Please try in this way

[HttpGet]
public async Task Get(string keyword="")
{

}

Just write [HttpGet] above your method and string keyword="" so when there's a no keyword you can get value based on that empty string
prasanna p6y ago
Hi Ramachandran,

No Route and Route Prefix on controller above.It is a async method called like this

public async Task Get(string keyword)
{

}
It needs to be get data through stored procedure based on keyword.
api/Entity(controllername)?keyword=A Result should print all data starts with A letter.

if keyword not enterd means api/Entity(controllername)?keyword= then it will show all the records.

please help me to fix the issue.
Ramachandran M6y ago
Hi Prasanna

My suggestion is kindly make sure RoutePrefix applied or not

[RoutePrefix("ControllerName")]
Above Controller Name
prasanna p6y ago
We don't have Route and HttpGet

simply calling like this

public async Task Get(string keyword)
{

}

API: api/Entity(controllername)?keyword=
Ramachandran M6y ago
Change HttpGet attribute name like below and use url like

"api/controller/methodName/parameterValue"

[HttpGet("methodName/{ParameterValue}")]
public IActionResult methodName(string ParameterValue)
{
------
}