public async Task<IActionResult> GetFromMvc()
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("https://yourdomain.com/");
        var response = await client.GetAsync("mvccontroller/action");
        if (response.IsSuccessStatusCode)
        {
            var content = await response.Content.ReadAsStringAsync();
            return Ok(content);
        }
        return BadRequest();
    }
}

public IActionResult CallMvcAction()
{
    var mvcController = new MvcController();
    return mvcController.TargetAction();
}

// 将MVC控制器中的逻辑提取到服务
public class MyService
{
    public string GetData()
    {
        return "Data from service";
    }
}

// 在MVC控制器中使用
public class MvcController : Controller
{
    private readonly MyService _service;
    
    public MvcController(MyService service)
    {
        _service = service;
    }
    
    public IActionResult Index()
    {
        return View(_service.GetData());
    }
}

// 在Web API中使用相同服务
[ApiController]
[Route("api/[controller]")]
public class MyApiController : ControllerBase
{
    private readonly MyService _service;
    
    public MyApiController(MyService service)
    {
        _service = service;
    }
    
    [HttpGet]
    public IActionResult Get()
    {
        return Ok(_service.GetData());
    }
}