.NET Core 2.1 更新 .NET Core 3.1 踩坑（二）

目錄

問題描述

Startup 檔案對比

.Net Core 2.1

.Net Core 3.1

解決辦法

問題描述

無法使用 app.UseMvc(options) 方法

Startup 檔案對比

.Net Core 2.1

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);
        }

        // 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
            {
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseMvc();
        }
    }
           

.Net Core 3.1

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.AddControllers();
        }

        // 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();
            });
        }
    }
           

解決辦法

将 .Net Core 2.1 的 Startup 檔案修改成 .net Core 3.1 版本的即可；标準的模版參考如上代碼。項目具體解決參考如下代碼：

// 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)
                .SetCompatibilityVersion(CompatibilityVersion.Latest);

            services.AddControllers(); 
        }

// 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
            {
                //https://localhost:44367/swagger/v1.0/index.html
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            
            // 2.1 > 3.1将 UseMvcWithDefaultRoute() 改為 UseRouting() + UseEndpoints() 就可以了
            //app.UseMvc(routes =>
            //{
            //    routes.MapRoute(
            //        name: "default",
            //        template: "cese2/{controller}/{action=Index}/{id?}");
            //});

            app.UseRouting();
            app.UseAuthorization();  
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "cese2/{controller}/{action=Index}/{id?}");
                //endpoints.MapRazorPages();
                endpoints.MapControllers();
            });
        }