Questions

Answer the following questions to test the knowledge that you have gained in this chapter:

1. We have a class that we want to register for dependency injection. During the handling of a request, the class will be referenced several times by other classes. We want a new instance of the class to be created when injected into a class rather than an existing instance to be used. What method in IServiceCollection should we use to register the dependency?
2. In a controller action method, if a resource can't be found, what method can we use in ControllerBase to return status code 404?
3. In a controller action method to post a new building, we implement some validation that requires a database call to check whether the building already exists. If the building does already exist, we want to return HTTP status code 400:

   [HttpPost]
   public ActionResult<BuildingResponse> PostBuilding(BuildingPostRequest buildingPostRequest)
   {
     ...