How to validate Query String url before execution of JsonResult or ActionResult of mvc5

Question

Below is my code of MVC JsonResult method

 [HttpGet]
  //[HttpGet("user/register/{OrgId:int}/{dealerId:int}")] 
  public JsonResult register(int? OrgId, int dealerId)
   {
     //my code
   }

I am trying if query string value is not there means handle the error to not go yellow page above i have tried commented line but this is not working for me to validate url have query string values.

Answer 1

Use a nullable type for each input parameter and use a unique route.

[HttpGet("getbyOrgIdandDealerId")]
public IActionResult Get(int? OrgId, int? DealerId)
{
    return Ok(new { orgId = OrgId, dealerId = DealerId });
}

URLs

https://localhost:44352/api/valuesgetbyOrgIdandDealerId?OrgId=1&DealerId=2
https://localhost:44352/api/values/getbyOrgIdandDealerId