asp.net-web-api – 无法在ASP.NET Core 1.0中启用跨源请求(CORS

card.service.ts：Angular 2代码.它在http：// localhost：3000上运行.我怀疑这里有问题.

import { Injectable } from 'angular2/core';
import { Http,Response } from 'angular2/http';
import { Observable } from 'rxjs/Observable';

import { ICard } from './card';

@Injectable()
export class CardService {
    constructor(private _http: Http) { }

    getCards(): Observable<ICard[]> {
        return this._http.get('http://localhost:8462/api/card')
            .map((response: Response) => <ICard[]>response.json())
            .do(data => console.log("getCards: " + JSON.stringify(data)))
            .catch(this.handleError);
    }

    private handleError(error: Response) {
        console.error(error);
        return Observable.throw(error.json().error || 'Server error')
    }    
}

Startup.cs：ASP.NET核心代码.在http：// localhost：8462上运行.我相信修复是将CORS添加到我的Startup.cs文件中.我试过跟随ASP.NET docs on CORS,以及许多其他CORS指南没有运气.

public void ConfigureServices(IServiceCollection services)
        services.AddMvc();
        services.AddCors();
}

public void Configure(IApplicationBuilder app,IHostingEnvironment env)
    {
        app.UseIISPlatformHandler();

        app.UseApplicationInsightsExceptionTelemetry();

        app.StaticFiles();

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

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