为什么我的 API 调用没有通过邮递员触发？ MVC1005警告

Question

我正在尝试进行 API 调用；我启动 Visual Studio 并在邮递员中输入：http://localhost:51266/api/country我在该方法上设置了断点，但没有任何反应。我得到了 404 未找到。这是控制器：[Route("api/[controller]")][ApiController]public class CountryController : Controller{    private ICountryRepository countryRepository;    public CountryController(ICountryRepository repository)    {        this.countryRepository = repository;    }    [HttpGet]    public IActionResult GetCountries()    {        var countries = countryRepository.GetCountries().ToList();        return Ok(countries);    }}我在这里做错了什么？我在 Startup 中有这个：public void ConfigureServices(IServiceCollection services){    services.AddMvc();    var connectionString = Configuration["connectionStrings:bookDbConnectionString"];    services.AddDbContext<BookDbContext>(c => c.UseSqlServer(connectionString));    services.AddScoped<ICountryRepository, CountryRepository>();}我现在有这样的：[ApiController]public class CountryController : Controller{    private ICountryRepository countryRepository;    public CountryController(ICountryRepository repository)    {        this.countryRepository = repository;    }    [HttpGet]    [Route("api/[controller]")]    public IActionResult GetCountries()    {        var countries = countryRepository.GetCountries().ToList();        return Ok(countries);    }}和我的启动课程：public class Startup{    public static IConfiguration Configuration { get; set; }    public Startup(IConfiguration configuration)    {        Configuration = configuration;    }我收到这个警告：警告 MVC1005使用“UseMvc”使用端点路由时不支持配置 MVC。要继续使用“UseMvc”，请设置“MvcOptions.EnableEndpointRouting = false”在“配置服务”内。 WebApplication2 D:\Mijn Documents\VisualStudio_2019\WebApplication2\WebApplication2\Startup.cs

Answer 1

解决方案是这样的：

public void ConfigureServices(IServiceCollection services) {           

    services.AddMvc();

    services.AddControllers(); //added this

    var connectionString = Configuration["connectionStrings:bookDbConnectionString"];

    services.AddDbContext<BookDbContext>(c => c.UseSqlServer(connectionString));

    services.AddScoped<ICountryRepository, CountryRepository>();

}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, BookDbContext context) {

    if (env.IsDevelopment()) {

        app.UseDeveloperExceptionPage();

    }

  

    app.UseRouting(); //uncommented 

    app.UseAuthorization(); //added this

    app.UseEndpoints(endpoints => { //added this

        endpoints.MapControllers();

    });

    //removed the app.UseMvc(); line

}

Answer 2

结合不同的方法来实现这一目标

[Route("api/country")]

[ApiController]

public class CountryController : Controller

{

    private ICountryRepository countryRepository;

    public CountryController(ICountryRepository repository)

    {

        this.countryRepository = repository;

    }

    [HttpGet]

    public IActionResult GetCountries()

    {

        var countries = countryRepository.GetCountries().ToList();

        return Ok(countries);

    }

 }

或者

[Route("api/[controller]")]

[ApiController]

public class CountryController : Controller

{

    private ICountryRepository countryRepository;

    public CountryController(ICountryRepository repository)

    {

        this.countryRepository = repository;

    }

    [HttpGet("")]

    public IActionResult GetCountries()

    {

        var countries = countryRepository.GetCountries().ToList();

        return Ok(countries);

    }

 }

我最喜欢这个，我认为它是最直观的

[Route("api")]

[ApiController]

public class CountryController : Controller

{

    private ICountryRepository countryRepository;

    public CountryController(ICountryRepository repository)

    {

        this.countryRepository = repository;

    }

    [HttpGet("country")]

    public IActionResult GetCountries()

    {

        var countries = countryRepository.GetCountries().ToList();

        return Ok(countries);

    }

 }

如果这些都不起作用，那是因为您没有在 中的 方法中调用 app.UseMVcConfigureStartup.cs

Answer 3

问题是路线，必须继续行动

[HttpGet]

[Route("api/[controller]")]

public IActionResult GetCountries()

或者，您可以将路由保留在控制器上，然后将一个空路由添加到操作中：

[Route("")]