如何调用异步任务类型的方法 <IHttpActionResult> 来自另一个项目？

Question

I have a C# Azure application where I have two websites in my solution. One is an outward facing website that a user hits, and the other is an API that the website hits to create users, etc.

Inside the second project (the API project), I've build a Register method with the code:

// POST api/Account/Register
[AllowAnonymous]
[Route("Register")]
public async Task<IHttpActionResult> Register(UserModel userModel)
{
     if (!ModelState.IsValid) {
        return BadRequest(ModelState);
     }

     IdentityResult result = await _repo.RegisterUser(userModel);
     IHttpActionResult errorResult = GetErrorResult(result);

     if (errorResult != null) {
         return errorResult;
     }
     return Ok();
}

This works great when calling this through a URL, and it works great when I call it via javascript in the website project.

However, I would like to now call this method from the server side of the website project, yet when I use the code:

SecondProject.API.Controllers.AccountController UserApiController = new SecondProject.API.Controllers.AccountController();
UserApiController.Register(UserApiModel);

visual studio warns me I should use await .

So if I add:

await UserApiController.Register(UserApiModel);

visual studio tells me the await operator can only be used in an async method.

How can I call my Register method inside SecondProject.API from my first project on via server code????

Answer 1

You need to declare the calling method as async .

Official documentation

public async Task CallingMethod()
{
    //...
    SecondProject.API.Controllers.AccountController UserApiController = new SecondProject.API.Controllers.AccountController();
    await UserApiController.Register(UserApiModel);
    //...
}

EDIT:

In saying that, you should not be creating controller and calling methods in code. You should be using the repository, as you do in your controller method.

public async Task CallingMethod()
{
    //...
    IdentityResult result = await _repo.RegisterUser(userModel);
    //Do something with the result
    //...
}