api调用不会用邮递员触发

Question

我正在尝试获取 api 调用。所以我启动 Visual Studio 并在邮递员中输入：

http://localhost:51266/api/country

我在方法上设置了一个断点。但什么也没有发生。我得到一个 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>();
}

我现在是这样的：

[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);
    }
}

还有我的创业班：

public class Startup
{
    public static IConfiguration Configuration { get; set; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();

        var connectionString = Configuration["connectionStrings:bookDbConnectionString"];
        services.AddDbContext<BookDbContext>(c => c.UseSqlServer(connectionString));

        services.AddScoped<ICountryRepository, CountryRepository>();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env, BookDbContext context)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseRouting();
    }
}

如果我这样做：

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, BookDbContext context)
{
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        //app.UseRouting();

        app.UseMvc();
}

我收到此警告：

警告 MVC1005
使用端点路由时不支持使用“UseMvc”配置 MVC。要继续使用“UseMvc”，请在“ConfigureServices”中设置“MvcOptions.EnableEndpointRouting = false”。 WebApplication2 D:\Mijn Documents\VisualStudio_2019\WebApplication2\WebApplication2\Startup.cs

Answer 1

啊，好吧。我看了好几个小时。解决方案是这样的：

public void ConfigureServices(IServiceCollection services)
        {           

            services.AddMvc();

            services.AddControllers();


            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();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });


        }

Answer 2

问题是路线，它必须继续行动

[HttpGet]
[Route("api/[controller]")]
public IActionResult GetCountries()

或者，您可以将路由保留在控制器上，然后在操作中添加一个空的：

[路线("")]

Answer 3

几种不同的方法来实现这一点

[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

[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);

    }
 }

虽然我最喜欢这个，但我认为它最直观

[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 Startup.cs 的 Configure 方法中调用 app.UseMVc