ASP.Net Core 3.0 应用程序 URL 未找到路径参数

Question

we have defined AddMvc() and UseMvc() methods in our startup.cs file bur, however, the controller action is not found by hitting the URL directly as below

https://localhost:44384/api/weatherforecast/getmyWeather/10 

isn't working in our browser, however, https://localhost:44384/api/weatherforecast/getmyWeather & https://localhost:44384/api/weatherforecast/getmyWeather?id=10 works

Startup.cs

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

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc(options => options.EnableEndpointRouting = false);

        }

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

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            //app.UseEndpoints(endpoints =>
            //{
            //    endpoints.MapControllers();
            //});
            app.UseMvc(routes => { routes.MapRoute("default", "api/{controller=Default}/{action=Index}/{id?}"); });
        }
    }

And on WeatherForecastController.cs

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

    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        [Route("getmyWeather")]
        public IEnumerable<WeatherForecast> getmyWeather(int id)
        {
            var rng = new Random(id);
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }

Not sure why Path parameters in URL are not working but querystrings does. what am I missing here?

Answer 1

In order to use conventional routes for API , you need to disable attribute route on API . In your startup.cs:

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

        app.UseHttpsRedirection();

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
          endpoints.MapControllerRoute(
            name: "Default",
            pattern: "{controller=default}/{action=Index}/{id?}");
        });
    }

And your Controller will look like:

    //[ApiController]
    //[Route("api/[controller]")]    
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"};

    private readonly ILogger<WeatherForecastController> _logger;

    public WeatherForecastController(ILogger<WeatherForecastController> logger)
    {
        _logger = logger;
    }

    [HttpGet]
    [Route("getmyWeather")]
    public IEnumerable<WeatherForecast> getmyWeather(int id)
    {
        var rng = new Random(id);
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        })
        .ToArray();
    }
}

OR you can create your own custom base controller and use that:

[Route("api/[controller]/[action]/{id?}")]
[ApiController]
public class MyBaseController : ControllerBase
{
}

And your Controller :

public class WeatherForecastController : MyBaseController 
{
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"};

    private readonly ILogger<WeatherForecastController> _logger;

    public WeatherForecastController(ILogger<WeatherForecastController> logger)
    {
        _logger = logger;
    }

    [HttpGet]
    [Route("getmyWeather")]
    public IEnumerable<WeatherForecast> getmyWeather(int id)
    {
        var rng = new Random(id);
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        })
        .ToArray();
    }
}