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) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; services.AddMvc();&nbsp; &nbsp; services.AddControllers(); //added this&nbsp; &nbsp; var connectionString = Configuration["connectionStrings:bookDbConnectionString"];&nbsp; &nbsp; services.AddDbContext<BookDbContext>(c => c.UseSqlServer(connectionString));&nbsp; &nbsp; services.AddScoped<ICountryRepository, CountryRepository>();}public void Configure(IApplicationBuilder app, IWebHostEnvironment env, BookDbContext context) {&nbsp; &nbsp; if (env.IsDevelopment()) {&nbsp; &nbsp; &nbsp; &nbsp; app.UseDeveloperExceptionPage();&nbsp; &nbsp; }&nbsp;&nbsp;&nbsp; &nbsp; app.UseRouting(); //uncommented&nbsp;&nbsp; &nbsp; app.UseAuthorization(); //added this&nbsp; &nbsp; app.UseEndpoints(endpoints => { //added this&nbsp; &nbsp; &nbsp; &nbsp; endpoints.MapControllers();&nbsp; &nbsp; });&nbsp; &nbsp; //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{&nbsp; &nbsp; private ICountryRepository countryRepository;&nbsp; &nbsp; public CountryController(ICountryRepository repository)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; this.countryRepository = repository;&nbsp; &nbsp; }&nbsp; &nbsp; [HttpGet]&nbsp; &nbsp; public IActionResult GetCountries()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; var countries = countryRepository.GetCountries().ToList();&nbsp; &nbsp; &nbsp; &nbsp; return Ok(countries);&nbsp; &nbsp; }&nbsp;}或者[Route("api/[controller]")][ApiController]public class CountryController : Controller{&nbsp; &nbsp; private ICountryRepository countryRepository;&nbsp; &nbsp; public CountryController(ICountryRepository repository)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; this.countryRepository = repository;&nbsp; &nbsp; }&nbsp; &nbsp; [HttpGet("")]&nbsp; &nbsp; public IActionResult GetCountries()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; var countries = countryRepository.GetCountries().ToList();&nbsp; &nbsp; &nbsp; &nbsp; return Ok(countries);&nbsp; &nbsp; }&nbsp;}我最喜欢这个，我认为它是最直观的[Route("api")][ApiController]public class CountryController : Controller{&nbsp; &nbsp; private ICountryRepository countryRepository;&nbsp; &nbsp; public CountryController(ICountryRepository repository)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; this.countryRepository = repository;&nbsp; &nbsp; }&nbsp; &nbsp; [HttpGet("country")]&nbsp; &nbsp; public IActionResult GetCountries()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; var countries = countryRepository.GetCountries().ToList();&nbsp; &nbsp; &nbsp; &nbsp; return Ok(countries);&nbsp; &nbsp; }&nbsp;}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("")]