Angular API call is not hitting in controller method

I am not able to hit my controller method Get.

I have register.component.ts file in this I am calling dataservice's getfeed method:

ngOnInit() {
this.dataservice.getFeed('register').subscribe(result => {
}

in the data.service.ts file, I have written like:

@Injectable()
export class DataService {
constructor(private http: HttpClient) { }

getFeed(methodName: string): Observable<any> {

return this.http.get(environment.baseApiUrl + methodName);
}
}

In My environment.ts file I have:

 baseApiUrl:'http://localhost:4200/api/'

And finally in RegisterController.cs I coded like:

[ApiController]
[Route("[controller]")]
public class RegisterController : ControllerBase
{
    [HttpGet]
    [ProducesResponseType(400)]
    [ProducesResponseType(typeof(string), 500)]
    public async Task<IActionResult> Get()
    {
    }
}

But this Get is not hitting no way. I tried different URL directly from browser, but nothing is hitting in that get method. Any idea what I am missing in my implementation?

And in my Startup.cs file i have something like this:

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(name: "default", pattern: "{controller}/{action=index}/{id?}");
        });