C# 未找到控制器方法-AmbiguousActionException

我试图调用控制器的httpget方法。但是它总是404。我添加了所有必需的指令。当我直接调用类名时，我得到了这个异常

AmbiguousActionException: Multiple actions matched. The following actions matched route data and had all constraints satisfied:

控制器

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace WebApplication2.Controllers
{
    [Route("api/[controller]")]
    public class ScannerController : Controller
    {

        [HttpGet]
        public async Task<IActionResult> dostuff(string file_id)
        {
            return null;
        }
    }
}

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SpaServices.AngularCli;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using WebApplication2.Models;

namespace WebApplication2
{
    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().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            // In production, the Angular files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/dist";
            });

            // requires using Microsoft.Extensions.Options
            services.Configure<DatabaseSettings>(
                Configuration.GetSection(nameof(DatabaseSettings)));

            services.AddSingleton<IDatabaseSettings>(sp =>
                sp.GetRequiredService<IOptions<DatabaseSettings>>().Value);


        }

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

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            //app.UseSpaStaticFiles();


            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller}/{action=Index}/{id?}");
            });

            app.UseSpa(spa =>
            {
                // To learn more about options for serving an Angular SPA from ASP.NET Core,
                // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseProxyToSpaDevelopmentServer("http://localhost:4200");

                }
            });
        }
    }
}

使用系统；
使用System.Collections.Generic；
使用System.IO；
使用System.Linq；
使用System.Threading.Tasks；
使用Microsoft.AspNetCore.Mvc；
//有关为空项目启用Web API的更多信息，请访问https://go.microsoft.com/fwlink/?LinkID=397860
命名空间WebApplication2.Controllers
{
[路由（“api/[控制器]”）]
公共类扫描控制器：控制器
{
[HttpGet]
公共异步任务dostuff（字符串文件\u id）
{
返回null；
}
}
}

Startup.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace WebApplication2.Controllers
{
    [Route("api/[controller]")]
    public class ScannerController : Controller
    {

        [HttpGet]
        public async Task<IActionResult> dostuff(string file_id)
        {
            return null;
        }
    }
}

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SpaServices.AngularCli;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using WebApplication2.Models;

namespace WebApplication2
{
    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().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            // In production, the Angular files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/dist";
            });

            // requires using Microsoft.Extensions.Options
            services.Configure<DatabaseSettings>(
                Configuration.GetSection(nameof(DatabaseSettings)));

            services.AddSingleton<IDatabaseSettings>(sp =>
                sp.GetRequiredService<IOptions<DatabaseSettings>>().Value);


        }

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

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            //app.UseSpaStaticFiles();


            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller}/{action=Index}/{id?}");
            });

            app.UseSpa(spa =>
            {
                // To learn more about options for serving an Angular SPA from ASP.NET Core,
                // see https://go.microsoft.com/fwlink/?linkid=864501

                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseProxyToSpaDevelopmentServer("http://localhost:4200");

                }
            });
        }
    }
}

使用Microsoft.AspNetCore.Builder；
使用Microsoft.AspNetCore.Hosting；
使用Microsoft.AspNetCore.HttpsPolicy；
使用Microsoft.AspNetCore.Mvc；
使用Microsoft.AspNetCore.SpaServices.AngularCli；
使用Microsoft.Extensions.Configuration；
使用Microsoft.Extensions.DependencyInjection；
使用Microsoft.Extensions.Options；
使用WebApplication2.Models；
命名空间WebApplication2
{
公营创业
{
公共启动（IConfiguration配置）
{
配置=配置；
}
公共IConfiguration配置{get；}
//此方法由运行时调用。请使用此方法将服务添加到容器中。
public void配置服务（IServiceCollection服务）
{
services.AddMvc（）.SetCompatibilityVersion（CompatibilityVersion.Version_2_1）；
//在生产中，角度文件将从此目录中提供
services.AddSpaStaticFiles（配置=>
{
configuration.RootPath=“ClientApp/dist”；
});
//需要使用Microsoft.Extensions.Options
服务。配置(
GetSection（nameof（DatabaseSettings））；
services.AddSingleton（sp=>
sp.GetRequiredService（）.Value）；
}
//此方法由运行时调用。请使用此方法配置HTTP请求管道。
公共无效配置（IApplicationBuilder应用程序，IHostingEnvironment环境）
{
if（env.IsDevelopment（））
{
app.UseDeveloperExceptionPage（）；
}
其他的
{
app.UseExceptionHandler（“/Error”）；
app.UseHsts（）；
}
app.UseHttpsRedirection（）；
app.UseStaticFiles（）；
//app.UseSpaStaticFiles（）；
app.UseMvc（路由=>
{
routes.MapRoute(
名称：“默认”，
模板：“{controller}/{action=Index}/{id？}”）；
});
app.UseSpa（spa=>
{
//要从ASP.NET Core了解更多有关提供角度SPA的选项，
//看https://go.microsoft.com/fwlink/?linkid=864501
spa.Options.SourcePath=“ClientApp”；
if（env.IsDevelopment（））
{
spa.UseProxyToSpadDevelopmentServer（“http://localhost:4200");
}
});
}
}
}

将

dostuff

方法上的路线更改为：

[HttpGet("dostuff")]

---

您正在调用GET-api/scanner/dostuff？这看起来很奇怪[Route（“api/[controller]”]）@ricardopers是的