Accessing querystring in ASP.NET MVC6

Question

I am trying to access query string parameters in my ASP.NET MVC6 applications. But it seems unlike MVC5 and web forms, QueryString doesn't have any indexer and I can't say something like:

string s = Request.QueryString["key1"] //gives error

So, my question is - how do I access query string parameters in MVC6?

Surprisingly Request.Forms collection works as expected (as in MVC5 or web forms).

Thank you.

Solution 1

Getting query with an indexer is supported.

See MVC code test here - https://github.com/aspnet/Mvc/blob/e0b8532735997c439e11fff68dd342d5af59f05f/test/WebSites/ControllersFromServicesClassLibrary/QueryValueService.cs

context.Request.Query["value"];

Also note that in MVC 6 you can model bind directly from query by using the [FromQuery] attribute.

public IActionResult ActionMethod([FromQuery]string key1)
{
    ...
}

Solution 2

So, my question is - how do I access query string parameters in MVC6?

You can use Request.Query which is new addition in ASPNET 5.

 var queryStrings = Request.Query;

The URL I am going to try was - http://localhost:12048/Home/Index?p=123&q=456 And you can get All Keys using -

queryStrings.Keys

And then you can get the values by iterating keys -

 var qsList = new List<string>();
 foreach(var key in queryStrings.Keys)
 {
      qsList.Add(queryStrings[key]);
 }

Comments

[Akash Kava]

You are not supposed to use QueryString or Form in MVC, instead you should have parameter in your controller that will automatically bind to the values.

[galdin]

[FromQuery] is what I was missing

[Michael Silver]

This is actually a learning moment. I had no idea [FromQuery] even existed. It doesn't seem to be well documented. There is also a [FromHeader] and [FromForm] among others. You can even write custom binders, as well.