Selfhost REST / ApiController - 过滤参数怎么做？

Question

I got multiple problems. The first is that i dont know what many things are called because its a " you never did this before and it needs to be done yesterday "-project.

• I need to create a REST service as part of a winforms application. It needs to return json. No html and no other webstuff, so i dont need the ASP.Net/Core overhead.
• I decided on OWIN selfhost because the Self-Host ASP.NET Web API is tagged as " old, use owin instead ", so i did that.
• It is not ASP MVC

What works:

• I got that thing running according to https://docs.microsoft.com/en-us/aspnet/web-api/overview/hosting-aspnet-web-api/use-owin-to-self-host-web-api and the get/post etc. commands all work.
• I found questions on SO that showed me how to return result codes and json constructs, nice!

What i didnt get to work is those ?category=searchterm stuff.

In the old API https://docs.microsoft.com/en-us/aspnet/web-api/overview/older-versions/self-host-a-web-api it is shown to work by just adding a method like this and i don't know how but it looks like by reflection magic this should be called by /api/products/?category=category which in my case, in OWIN it does not.

public IEnumerable<Product> GetProductsByCategory(string category)
{
  return products.Where(p => string.Equals(p.Category, category,StringComparison.OrdinalIgnoreCase));
 }

I'm not sure what i should do. The documentation doesn't show anything on how to enable it. Depending on where i looks, its called "query" or "filter", but searching that leads to a lot of stuff that is not related. What is that even called?

Thanks for taking the time to read!

Answer 1

Surprise, the answer is damn simple.

    public IEnumerable<string> Get()
    {
        // The ApiController has a property for the current request which contains the query string.
        var query = this.Request.RequestUri.Query;
        return new string[] { "value1", "value2" };
    }

Special thanks to @MindSwipe whose link wasn't the answer but got me on the right track.