.net core配置接口可跨域访问

修改Startup.cs文件启用。

1.在方法ConfigureServices内配置以下代码(MyAllowSpecificOrigins为自己定义的一个常量存放跨域策略名，可直接使用字符)

  //启用跨域
            services.AddCors(options =>
            {
                options.AddPolicy(MyAllowSpecificOrigins,
                    builder => builder.AllowAnyOrigin()
                      .AllowAnyMethod()
                      .AllowAnyHeader()
                      .AllowCredentials()
                .Build());
            });

2.在方法Configure配置以下代码

// 跨域
            app.UseHttpsRedirection().UseCors(builder =>
            builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());

把整个Startup.cs代码粘出来

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

        public IConfiguration Configuration { get; }

        private readonly string MyAllowSpecificOrigins = "CorsPolicy";

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });


            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            //启用跨域
            services.AddCors(options =>
            {
                options.AddPolicy(MyAllowSpecificOrigins,
                    builder => builder.AllowAnyOrigin()
                      .AllowAnyMethod()
                      .AllowAnyHeader()
                      .AllowCredentials()
                .Build());
            });
        }

        // 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("/Home/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();
            app.UseCookiePolicy();

            app.UseUrlMiddleWare();
            // 跨域
            app.UseHttpsRedirection().UseCors(builder =>
            builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());

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