嗨，我是编码新手，目前正在构建 MVC，但出现 CS0161 错误，我似乎无法修复它。任何帮助表示赞赏

Question

namespace Funko626.Controllers
{
    public class FunkoController : Controller
    {
        private readonly IFunkoRepository _funkoRepository;
        private readonly IBrandRepository _brandRepository;

        public FunkoController(IFunkoRepository funkoRepository, IBrandRepository brandRepository)
        {
         _funkoRepository = funkoRepository;
         _brandRepository = brandRepository;
        }

        public ViewResult List()
        {
            FunkoListViewModel funkoListViewModel = new()
            {
                Funkos = _funkoRepository.AllFunkos,

                CurrentBrand = " "
            };
            return View(funkoListViewModel);
        }
       //I think it's this part of the code with 'int id' but cant be sure.
        public IActionResult Details(int id)
        {
            var funko = _funkoRepository.GetFunkoById(id);
            if(funko == null)
                return NotFound();
        }

    }
}

Severity Code Description Project File Line Suppression State Error CS0161 'FunkoController.Details(int)': not all code paths return a value Funko626 C:\Users\bidde\source\repos\Funko626\Controllers\FunkoController.cs 29 Active

Answer 1

CS0161 是您在编程中遇到的最明显的错误。它说

A method that returns a value must have a return statement in all code paths

这意味着，在英语中，如果您的方法 return 是某种东西，那么每个代码路径都必须 return 那种东西

所以这里出了什么问题：

public IActionResult Details(int id)
{
    var funko = _funkoRepository.GetFunkoById(id);
    if(funko == null)
         return NotFound();
}

如果 funko 是 NOT null 那么什么都不会 returned。通过 returning 低于 if 条件的内容来修复它。通常这可能看起来像：

public IActionResult Details(int id)
{
    var funko = _funkoRepository.GetFunkoById(id);
    if(funko == null)
         return NotFound();

    // we found a funko!
    return Ok(funko);
}

嗨，我是编码新手，目前正在构建 MVC，但出现 CS0161 错误，我似乎无法修复它。任何帮助表示赞赏

Hi, I am new to coding and currently building an MVC and I have a CS0161 ERROR and I cant seem to fix it. Any help appreciated

c#

asp.net-mvc